potentialMatchingInterfaces != 0 assertion when compiling comparers #89918

Closed
#89969
Closed
potentialMatchingInterfaces != 0 assertion when compiling comparers#89918
#89969
Assignees
jkotas
Labels
area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue

Description

@MichalStrehovsky
MichalStrehovsky
opened on Aug 3, 2023

We're trying to resolve a constrained call to {[S.P.CoreLib]System.IComparable``1<StructGenericString``1<System.__Canon>>.CompareTo(StructGenericString``1<__Canon>)} on type {[repro]StructGenericString``1<System.__Canon>}.

Debug.Assert(potentialMatchingInterfaces != 0);

 ILCompiler.Compiler.dll!ILCompiler.TypeExtensions.TryResolveConstraintMethodApprox(Internal.TypeSystem.TypeDesc constrainedType, Internal.TypeSystem.TypeDesc interfaceType, Internal.TypeSystem.MethodDesc interfaceMethod, out bool forceRuntimeLookup, ref Internal.TypeSystem.DefaultInterfaceMethodResolution staticResolution) Line 486	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportCall(Internal.IL.ILOpcode opcode, int token) Line 409	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlock(Internal.IL.ILImporter.BasicBlock basicBlock) Line 585	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlocks() Line 308	C#
>	ILCompiler.Compiler.dll!Internal.IL.ILImporter.Import() Line 166	C#

Repro program here:

// Licensed to the .NET Foundation under one or more agreements.// The .NET Foundation licenses this file to you under the MIT license.usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Runtime.CompilerServices;publicclassProgram{privatestaticints_ReturnCode=100;privatestaticvoidAssertEquals<T>(Texpected,Tactual,stringvalues="",[CallerLineNumber]intline=0){if(!expected.Equals(actual)){Console.WriteLine($"{values}{expected} != {actual}, L{line}");s_ReturnCode++;}}publicstaticintMain(){GetTypeTests();returns_ReturnCode;}privatestaticvoidGetTypeTests(){AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());}}publicstructStruct1:IComparable{publiclonga;publiclongb;publicintCompareTo(objectobj){returnobjisStruct1str?b.CompareTo(str.b):1;}}publicstructStructGeneric<T>:IEquatable<StructGeneric<T>>,IComparable<StructGeneric<T>>{publicTt;publicboolEquals(StructGeneric<T>s)=>EqualityComparer<T>.Default.Equals(t,s.t);publicintCompareTo(StructGeneric<T>s)=>Comparer<T>.Default.Compare(t,s.t);}publicstructStructGenericString<T>:IEquatable<string>,IComparable<string>{publicTt;publicboolEquals(strings)=>s==t?.ToString();publicintCompareTo(strings)=>Comparer<string>.Default.Compare(t?.ToString(),s);}structG<T,U>:IEquatable<G<U,T>>{publicboolEquals(G<U,T>x)=>false;}

Metadata

Metadata

Assignees

Labels

area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue

Type

No type

Projects

No projects

    Milestone

    No milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions

    , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
     blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

    Skip to content
    potentialMatchingInterfaces != 0 assertion when compiling comparers #89918
    Closed
    #89969
    Closed
    potentialMatchingInterfaces != 0 assertion when compiling comparers#89918
    #89969
    Assignees
    jkotas
    Labels
    area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
    Description
    @MichalStrehovsky
    MichalStrehovsky
    opened on Aug 3, 2023
    We're trying to resolve a constrained call to {[S.P.CoreLib]System.IComparable``1<StructGenericString``1<System.__Canon>>.CompareTo(StructGenericString``1<__Canon>)} on type {[repro]StructGenericString``1<System.__Canon>}.
    Debug.Assert(potentialMatchingInterfaces != 0);

     ILCompiler.Compiler.dll!ILCompiler.TypeExtensions.TryResolveConstraintMethodApprox(Internal.TypeSystem.TypeDesc constrainedType, Internal.TypeSystem.TypeDesc interfaceType, Internal.TypeSystem.MethodDesc interfaceMethod, out bool forceRuntimeLookup, ref Internal.TypeSystem.DefaultInterfaceMethodResolution staticResolution) Line 486	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportCall(Internal.IL.ILOpcode opcode, int token) Line 409	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlock(Internal.IL.ILImporter.BasicBlock basicBlock) Line 585	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlocks() Line 308	C#
>	ILCompiler.Compiler.dll!Internal.IL.ILImporter.Import() Line 166	C#

    Repro program here:
    // Licensed to the .NET Foundation under one or more agreements.// The .NET Foundation licenses this file to you under the MIT license.usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Runtime.CompilerServices;publicclassProgram{privatestaticints_ReturnCode=100;privatestaticvoidAssertEquals<T>(Texpected,Tactual,stringvalues="",[CallerLineNumber]intline=0){if(!expected.Equals(actual)){Console.WriteLine($"{values}{expected} != {actual}, L{line}");s_ReturnCode++;}}publicstaticintMain(){GetTypeTests();returns_ReturnCode;}privatestaticvoidGetTypeTests(){AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());}}publicstructStruct1:IComparable{publiclonga;publiclongb;publicintCompareTo(objectobj){returnobjisStruct1str?b.CompareTo(str.b):1;}}publicstructStructGeneric<T>:IEquatable<StructGeneric<T>>,IComparable<StructGeneric<T>>{publicTt;publicboolEquals(StructGeneric<T>s)=>EqualityComparer<T>.Default.Equals(t,s.t);publicintCompareTo(StructGeneric<T>s)=>Comparer<T>.Default.Compare(t,s.t);}publicstructStructGenericString<T>:IEquatable<string>,IComparable<string>{publicTt;publicboolEquals(strings)=>s==t?.ToString();publicintCompareTo(strings)=>Comparer<string>.Default.Compare(t?.ToString(),s);}structG<T,U>:IEquatable<G<U,T>>{publicboolEquals(G<U,T>x)=>false;}
    Metadata
    Metadata
    Assignees
    Labels
    area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
    Type
    No type
    Projects
    No projects
      Milestone
      No milestone
      Relationships
      None yet
      Development
      No branches or pull requests
      Issue actions
      
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

      Skip to content
      potentialMatchingInterfaces != 0 assertion when compiling comparers #89918
      Closed
      #89969
      Closed
      potentialMatchingInterfaces != 0 assertion when compiling comparers#89918
      #89969
      Assignees
      jkotas
      Labels
      area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
      Description
      @MichalStrehovsky
      MichalStrehovsky
      opened on Aug 3, 2023
      We're trying to resolve a constrained call to {[S.P.CoreLib]System.IComparable``1<StructGenericString``1<System.__Canon>>.CompareTo(StructGenericString``1<__Canon>)} on type {[repro]StructGenericString``1<System.__Canon>}.
      Debug.Assert(potentialMatchingInterfaces != 0);

       ILCompiler.Compiler.dll!ILCompiler.TypeExtensions.TryResolveConstraintMethodApprox(Internal.TypeSystem.TypeDesc constrainedType, Internal.TypeSystem.TypeDesc interfaceType, Internal.TypeSystem.MethodDesc interfaceMethod, out bool forceRuntimeLookup, ref Internal.TypeSystem.DefaultInterfaceMethodResolution staticResolution) Line 486	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportCall(Internal.IL.ILOpcode opcode, int token) Line 409	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlock(Internal.IL.ILImporter.BasicBlock basicBlock) Line 585	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlocks() Line 308	C#
>	ILCompiler.Compiler.dll!Internal.IL.ILImporter.Import() Line 166	C#

      Repro program here:
      // Licensed to the .NET Foundation under one or more agreements.// The .NET Foundation licenses this file to you under the MIT license.usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Runtime.CompilerServices;publicclassProgram{privatestaticints_ReturnCode=100;privatestaticvoidAssertEquals<T>(Texpected,Tactual,stringvalues="",[CallerLineNumber]intline=0){if(!expected.Equals(actual)){Console.WriteLine($"{values}{expected} != {actual}, L{line}");s_ReturnCode++;}}publicstaticintMain(){GetTypeTests();returns_ReturnCode;}privatestaticvoidGetTypeTests(){AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());}}publicstructStruct1:IComparable{publiclonga;publiclongb;publicintCompareTo(objectobj){returnobjisStruct1str?b.CompareTo(str.b):1;}}publicstructStructGeneric<T>:IEquatable<StructGeneric<T>>,IComparable<StructGeneric<T>>{publicTt;publicboolEquals(StructGeneric<T>s)=>EqualityComparer<T>.Default.Equals(t,s.t);publicintCompareTo(StructGeneric<T>s)=>Comparer<T>.Default.Compare(t,s.t);}publicstructStructGenericString<T>:IEquatable<string>,IComparable<string>{publicTt;publicboolEquals(strings)=>s==t?.ToString();publicintCompareTo(strings)=>Comparer<string>.Default.Compare(t?.ToString(),s);}structG<T,U>:IEquatable<G<U,T>>{publicboolEquals(G<U,T>x)=>false;}
      Metadata
      Metadata
      Assignees
      Labels
      area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
      Type
      No type
      Projects
      No projects
        Milestone
        No milestone
        Relationships
        None yet
        Development
        No branches or pull requests
        Issue actions
        
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

        Skip to content
        potentialMatchingInterfaces != 0 assertion when compiling comparers #89918
        Closed
        #89969
        Closed
        potentialMatchingInterfaces != 0 assertion when compiling comparers#89918
        #89969
        Assignees
        jkotas
        Labels
        area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
        Description
        @MichalStrehovsky
        MichalStrehovsky
        opened on Aug 3, 2023
        We're trying to resolve a constrained call to {[S.P.CoreLib]System.IComparable``1<StructGenericString``1<System.__Canon>>.CompareTo(StructGenericString``1<__Canon>)} on type {[repro]StructGenericString``1<System.__Canon>}.
        Debug.Assert(potentialMatchingInterfaces != 0);

         ILCompiler.Compiler.dll!ILCompiler.TypeExtensions.TryResolveConstraintMethodApprox(Internal.TypeSystem.TypeDesc constrainedType, Internal.TypeSystem.TypeDesc interfaceType, Internal.TypeSystem.MethodDesc interfaceMethod, out bool forceRuntimeLookup, ref Internal.TypeSystem.DefaultInterfaceMethodResolution staticResolution) Line 486	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportCall(Internal.IL.ILOpcode opcode, int token) Line 409	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlock(Internal.IL.ILImporter.BasicBlock basicBlock) Line 585	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlocks() Line 308	C#
>	ILCompiler.Compiler.dll!Internal.IL.ILImporter.Import() Line 166	C#

        Repro program here:
        // Licensed to the .NET Foundation under one or more agreements.// The .NET Foundation licenses this file to you under the MIT license.usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Runtime.CompilerServices;publicclassProgram{privatestaticints_ReturnCode=100;privatestaticvoidAssertEquals<T>(Texpected,Tactual,stringvalues="",[CallerLineNumber]intline=0){if(!expected.Equals(actual)){Console.WriteLine($"{values}{expected} != {actual}, L{line}");s_ReturnCode++;}}publicstaticintMain(){GetTypeTests();returns_ReturnCode;}privatestaticvoidGetTypeTests(){AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());}}publicstructStruct1:IComparable{publiclonga;publiclongb;publicintCompareTo(objectobj){returnobjisStruct1str?b.CompareTo(str.b):1;}}publicstructStructGeneric<T>:IEquatable<StructGeneric<T>>,IComparable<StructGeneric<T>>{publicTt;publicboolEquals(StructGeneric<T>s)=>EqualityComparer<T>.Default.Equals(t,s.t);publicintCompareTo(StructGeneric<T>s)=>Comparer<T>.Default.Compare(t,s.t);}publicstructStructGenericString<T>:IEquatable<string>,IComparable<string>{publicTt;publicboolEquals(strings)=>s==t?.ToString();publicintCompareTo(strings)=>Comparer<string>.Default.Compare(t?.ToString(),s);}structG<T,U>:IEquatable<G<U,T>>{publicboolEquals(G<U,T>x)=>false;}
        Metadata
        Metadata
        Assignees
        Labels
        area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
        Type
        No type
        Projects
        No projects
          Milestone
          No milestone
          Relationships
          None yet
          Development
          No branches or pull requests
          Issue actions
          
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

          Skip to content
          potentialMatchingInterfaces != 0 assertion when compiling comparers #89918
          Closed
          #89969
          Closed
          potentialMatchingInterfaces != 0 assertion when compiling comparers#89918
          #89969
          Assignees
          jkotas
          Labels
          area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
          Description
          @MichalStrehovsky
          MichalStrehovsky
          opened on Aug 3, 2023
          We're trying to resolve a constrained call to {[S.P.CoreLib]System.IComparable``1<StructGenericString``1<System.__Canon>>.CompareTo(StructGenericString``1<__Canon>)} on type {[repro]StructGenericString``1<System.__Canon>}.
          Debug.Assert(potentialMatchingInterfaces != 0);

           ILCompiler.Compiler.dll!ILCompiler.TypeExtensions.TryResolveConstraintMethodApprox(Internal.TypeSystem.TypeDesc constrainedType, Internal.TypeSystem.TypeDesc interfaceType, Internal.TypeSystem.MethodDesc interfaceMethod, out bool forceRuntimeLookup, ref Internal.TypeSystem.DefaultInterfaceMethodResolution staticResolution) Line 486	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportCall(Internal.IL.ILOpcode opcode, int token) Line 409	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlock(Internal.IL.ILImporter.BasicBlock basicBlock) Line 585	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlocks() Line 308	C#
>	ILCompiler.Compiler.dll!Internal.IL.ILImporter.Import() Line 166	C#

          Repro program here:
          // Licensed to the .NET Foundation under one or more agreements.// The .NET Foundation licenses this file to you under the MIT license.usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Runtime.CompilerServices;publicclassProgram{privatestaticints_ReturnCode=100;privatestaticvoidAssertEquals<T>(Texpected,Tactual,stringvalues="",[CallerLineNumber]intline=0){if(!expected.Equals(actual)){Console.WriteLine($"{values}{expected} != {actual}, L{line}");s_ReturnCode++;}}publicstaticintMain(){GetTypeTests();returns_ReturnCode;}privatestaticvoidGetTypeTests(){AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());}}publicstructStruct1:IComparable{publiclonga;publiclongb;publicintCompareTo(objectobj){returnobjisStruct1str?b.CompareTo(str.b):1;}}publicstructStructGeneric<T>:IEquatable<StructGeneric<T>>,IComparable<StructGeneric<T>>{publicTt;publicboolEquals(StructGeneric<T>s)=>EqualityComparer<T>.Default.Equals(t,s.t);publicintCompareTo(StructGeneric<T>s)=>Comparer<T>.Default.Compare(t,s.t);}publicstructStructGenericString<T>:IEquatable<string>,IComparable<string>{publicTt;publicboolEquals(strings)=>s==t?.ToString();publicintCompareTo(strings)=>Comparer<string>.Default.Compare(t?.ToString(),s);}structG<T,U>:IEquatable<G<U,T>>{publicboolEquals(G<U,T>x)=>false;}
          Metadata
          Metadata
          Assignees
          Labels
          area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
          Type
          No type
          Projects
          No projects
            Milestone
            No milestone
            Relationships
            None yet
            Development
            No branches or pull requests
            Issue actions
            
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

            Skip to content
            potentialMatchingInterfaces != 0 assertion when compiling comparers #89918
            Closed
            #89969
            Closed
            potentialMatchingInterfaces != 0 assertion when compiling comparers#89918
            #89969
            Assignees
            jkotas
            Labels
            area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
            Description
            @MichalStrehovsky
            MichalStrehovsky
            opened on Aug 3, 2023
            We're trying to resolve a constrained call to {[S.P.CoreLib]System.IComparable``1<StructGenericString``1<System.__Canon>>.CompareTo(StructGenericString``1<__Canon>)} on type {[repro]StructGenericString``1<System.__Canon>}.
            Debug.Assert(potentialMatchingInterfaces != 0);

             ILCompiler.Compiler.dll!ILCompiler.TypeExtensions.TryResolveConstraintMethodApprox(Internal.TypeSystem.TypeDesc constrainedType, Internal.TypeSystem.TypeDesc interfaceType, Internal.TypeSystem.MethodDesc interfaceMethod, out bool forceRuntimeLookup, ref Internal.TypeSystem.DefaultInterfaceMethodResolution staticResolution) Line 486	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportCall(Internal.IL.ILOpcode opcode, int token) Line 409	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlock(Internal.IL.ILImporter.BasicBlock basicBlock) Line 585	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlocks() Line 308	C#
>	ILCompiler.Compiler.dll!Internal.IL.ILImporter.Import() Line 166	C#

            Repro program here:
            // Licensed to the .NET Foundation under one or more agreements.// The .NET Foundation licenses this file to you under the MIT license.usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Runtime.CompilerServices;publicclassProgram{privatestaticints_ReturnCode=100;privatestaticvoidAssertEquals<T>(Texpected,Tactual,stringvalues="",[CallerLineNumber]intline=0){if(!expected.Equals(actual)){Console.WriteLine($"{values}{expected} != {actual}, L{line}");s_ReturnCode++;}}publicstaticintMain(){GetTypeTests();returns_ReturnCode;}privatestaticvoidGetTypeTests(){AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());}}publicstructStruct1:IComparable{publiclonga;publiclongb;publicintCompareTo(objectobj){returnobjisStruct1str?b.CompareTo(str.b):1;}}publicstructStructGeneric<T>:IEquatable<StructGeneric<T>>,IComparable<StructGeneric<T>>{publicTt;publicboolEquals(StructGeneric<T>s)=>EqualityComparer<T>.Default.Equals(t,s.t);publicintCompareTo(StructGeneric<T>s)=>Comparer<T>.Default.Compare(t,s.t);}publicstructStructGenericString<T>:IEquatable<string>,IComparable<string>{publicTt;publicboolEquals(strings)=>s==t?.ToString();publicintCompareTo(strings)=>Comparer<string>.Default.Compare(t?.ToString(),s);}structG<T,U>:IEquatable<G<U,T>>{publicboolEquals(G<U,T>x)=>false;}
            Metadata
            Metadata
            Assignees
            Labels
            area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
            Type
            No type
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              potentialMatchingInterfaces != 0 assertion when compiling comparers #89918
              Closed
              #89969
              Closed
              potentialMatchingInterfaces != 0 assertion when compiling comparers#89918
              #89969
              Assignees
              jkotas
              Labels
              area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
              Description
              @MichalStrehovsky
              MichalStrehovsky
              opened on Aug 3, 2023
              We're trying to resolve a constrained call to {[S.P.CoreLib]System.IComparable``1<StructGenericString``1<System.__Canon>>.CompareTo(StructGenericString``1<__Canon>)} on type {[repro]StructGenericString``1<System.__Canon>}.
              Debug.Assert(potentialMatchingInterfaces != 0);

               ILCompiler.Compiler.dll!ILCompiler.TypeExtensions.TryResolveConstraintMethodApprox(Internal.TypeSystem.TypeDesc constrainedType, Internal.TypeSystem.TypeDesc interfaceType, Internal.TypeSystem.MethodDesc interfaceMethod, out bool forceRuntimeLookup, ref Internal.TypeSystem.DefaultInterfaceMethodResolution staticResolution) Line 486	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportCall(Internal.IL.ILOpcode opcode, int token) Line 409	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlock(Internal.IL.ILImporter.BasicBlock basicBlock) Line 585	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlocks() Line 308	C#
>	ILCompiler.Compiler.dll!Internal.IL.ILImporter.Import() Line 166	C#

              Repro program here:
              // Licensed to the .NET Foundation under one or more agreements.// The .NET Foundation licenses this file to you under the MIT license.usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Runtime.CompilerServices;publicclassProgram{privatestaticints_ReturnCode=100;privatestaticvoidAssertEquals<T>(Texpected,Tactual,stringvalues="",[CallerLineNumber]intline=0){if(!expected.Equals(actual)){Console.WriteLine($"{values}{expected} != {actual}, L{line}");s_ReturnCode++;}}publicstaticintMain(){GetTypeTests();returns_ReturnCode;}privatestaticvoidGetTypeTests(){AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());}}publicstructStruct1:IComparable{publiclonga;publiclongb;publicintCompareTo(objectobj){returnobjisStruct1str?b.CompareTo(str.b):1;}}publicstructStructGeneric<T>:IEquatable<StructGeneric<T>>,IComparable<StructGeneric<T>>{publicTt;publicboolEquals(StructGeneric<T>s)=>EqualityComparer<T>.Default.Equals(t,s.t);publicintCompareTo(StructGeneric<T>s)=>Comparer<T>.Default.Compare(t,s.t);}publicstructStructGenericString<T>:IEquatable<string>,IComparable<string>{publicTt;publicboolEquals(strings)=>s==t?.ToString();publicintCompareTo(strings)=>Comparer<string>.Default.Compare(t?.ToString(),s);}structG<T,U>:IEquatable<G<U,T>>{publicboolEquals(G<U,T>x)=>false;}
              Metadata
              Metadata
              Assignees
              Labels
              area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
              Type
              No type
              Projects
              No projects
                Milestone
                No milestone
                Relationships
                None yet
                Development
                No branches or pull requests
                Issue actions
                
, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                Skip to content
                potentialMatchingInterfaces != 0 assertion when compiling comparers #89918
                Closed
                #89969
                Closed
                potentialMatchingInterfaces != 0 assertion when compiling comparers#89918
                #89969
                Assignees
                jkotas
                Labels
                area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
                Description
                @MichalStrehovsky
                MichalStrehovsky
                opened on Aug 3, 2023
                We're trying to resolve a constrained call to {[S.P.CoreLib]System.IComparable``1<StructGenericString``1<System.__Canon>>.CompareTo(StructGenericString``1<__Canon>)} on type {[repro]StructGenericString``1<System.__Canon>}.
                Debug.Assert(potentialMatchingInterfaces != 0);

                 ILCompiler.Compiler.dll!ILCompiler.TypeExtensions.TryResolveConstraintMethodApprox(Internal.TypeSystem.TypeDesc constrainedType, Internal.TypeSystem.TypeDesc interfaceType, Internal.TypeSystem.MethodDesc interfaceMethod, out bool forceRuntimeLookup, ref Internal.TypeSystem.DefaultInterfaceMethodResolution staticResolution) Line 486	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportCall(Internal.IL.ILOpcode opcode, int token) Line 409	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlock(Internal.IL.ILImporter.BasicBlock basicBlock) Line 585	C#
ILCompiler.Compiler.dll!Internal.IL.ILImporter.ImportBasicBlocks() Line 308	C#
>	ILCompiler.Compiler.dll!Internal.IL.ILImporter.Import() Line 166	C#

                Repro program here:
                // Licensed to the .NET Foundation under one or more agreements.// The .NET Foundation licenses this file to you under the MIT license.usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Runtime.CompilerServices;publicclassProgram{privatestaticints_ReturnCode=100;privatestaticvoidAssertEquals<T>(Texpected,Tactual,stringvalues="",[CallerLineNumber]intline=0){if(!expected.Equals(actual)){Console.WriteLine($"{values}{expected} != {actual}, L{line}");s_ReturnCode++;}}publicstaticintMain(){GetTypeTests();returns_ReturnCode;}privatestaticvoidGetTypeTests(){AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.String]]",Comparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[System.Object]]",Comparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",Comparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",Comparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.ObjectEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.String]]",EqualityComparer<StructGenericString<string>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[System.Object]]",EqualityComparer<StructGenericString<object>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.String]]]",EqualityComparer<StructGenericString<StructGeneric<string>>?>.Default.GetType().ToString());AssertEquals("System.Collections.Generic.NullableEqualityComparer`1[StructGenericString`1[StructGeneric`1[System.Object]]]",EqualityComparer<StructGenericString<StructGeneric<object>>?>.Default.GetType().ToString());}}publicstructStruct1:IComparable{publiclonga;publiclongb;publicintCompareTo(objectobj){returnobjisStruct1str?b.CompareTo(str.b):1;}}publicstructStructGeneric<T>:IEquatable<StructGeneric<T>>,IComparable<StructGeneric<T>>{publicTt;publicboolEquals(StructGeneric<T>s)=>EqualityComparer<T>.Default.Equals(t,s.t);publicintCompareTo(StructGeneric<T>s)=>Comparer<T>.Default.Compare(t,s.t);}publicstructStructGenericString<T>:IEquatable<string>,IComparable<string>{publicTt;publicboolEquals(strings)=>s==t?.ToString();publicintCompareTo(strings)=>Comparer<string>.Default.Compare(t?.ToString(),s);}structG<T,U>:IEquatable<G<U,T>>{publicboolEquals(G<U,T>x)=>false;}
                Metadata
                Metadata
                Assignees
                Labels
                area-NativeAOT-coreclrdisabled-testThe test is disabled in source code against the issue
                Type
                No type
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions