string.AsSpan(int, int) throws a misleading exception #115239

Closed as duplicate of#53622
Closed as duplicate of#53622
string.AsSpan(int, int) throws a misleading exception#115239
Labels
area-System.Memory
Milestone
Future

Description

@MihaZupan
MihaZupan
opened on May 2, 2025

"foo".AsSpan(0, largeNumber) will throw Specified argument was out of the range of valid values. (Parameter 'start').
Note the indicated parameter name. The issue here is the combination of start/length, and there's nothing you can change start to to make this valid as the issue happens to be in the length argument.

We could consider removing the ExceptionArgument.start, or use a different message that doesn't blame start specifically.

runtime/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs

Lines 191 to 207 in 27604b5

publicstaticReadOnlySpan<char>AsSpan(thisstring?text,intstart,intlength)
{
if(text==null)
{
if(start!=0||length!=0)
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
returndefault;
}
#if TARGET_64BIT
// See comment in Span<T>.Slice for how this works.
if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)text.Length)
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
#else
if((uint)start>(uint)text.Length||(uint)length>(uint)(text.Length-start))
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
#endif

We don't report the argument in Slice(int, int) for example

runtime/src/libraries/System.Private.CoreLib/src/System/Span.cs

Lines 398 to 412 in 27604b5

publicSpan<T>Slice(intstart,intlength)
{
#if TARGET_64BIT
// Since start and length are both 32-bit, their sum can be computed across a 64-bit domain
// without loss of fidelity. The cast to uint before the cast to ulong ensures that the
// extension from 32- to 64-bit is zero-extending rather than sign-extending. The end result
// of this is that if either input is negative or if the input sum overflows past Int32.MaxValue,
// that information is captured correctly in the comparison against the backing _length field.
// We don't use this same mechanism in a 32-bit process due to the overhead of 64-bit arithmetic.
if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)_length)
ThrowHelper.ThrowArgumentOutOfRangeException();
#else
if((uint)start>(uint)_length||(uint)length>(uint)(_length-start))
ThrowHelper.ThrowArgumentOutOfRangeException();
#endif

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      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
       blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n 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;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} 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
      string.AsSpan(int, int) throws a misleading exception #115239
      Closed as duplicate of#53622
      Closed as duplicate of#53622
      string.AsSpan(int, int) throws a misleading exception#115239
      Labels
      area-System.Memory
      Milestone
      Future
      Description
      @MihaZupan
      MihaZupan
      opened on May 2, 2025
      "foo".AsSpan(0, largeNumber) will throw Specified argument was out of the range of valid values. (Parameter 'start').
      
Note the indicated parameter name. The issue here is the combination of start/length, and there's nothing you can change start to to make this valid as the issue happens to be in the length argument.
      We could consider removing the ExceptionArgument.start, or use a different message that doesn't blame start specifically.
      runtime/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
      
Lines 191 to 207
in
27604b5
      publicstaticReadOnlySpan<char>AsSpan(thisstring?text,intstart,intlength)
      {
      if(text==null)
      {
      if(start!=0||length!=0)
      ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
      returndefault;
      }
       #if TARGET_64BIT
      // See comment in Span<T>.Slice for how this works.
      if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)text.Length)
      ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
       #else 
      if((uint)start>(uint)text.Length||(uint)length>(uint)(text.Length-start))
      ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
       #endif 
      We don't report the argument in Slice(int, int) for example
      runtime/src/libraries/System.Private.CoreLib/src/System/Span.cs
      
Lines 398 to 412
in
27604b5
      publicSpan<T>Slice(intstart,intlength)
      {
       #if TARGET_64BIT
      // Since start and length are both 32-bit, their sum can be computed across a 64-bit domain
      // without loss of fidelity. The cast to uint before the cast to ulong ensures that the
      // extension from 32- to 64-bit is zero-extending rather than sign-extending. The end result
      // of this is that if either input is negative or if the input sum overflows past Int32.MaxValue,
      // that information is captured correctly in the comparison against the backing _length field.
      // We don't use this same mechanism in a 32-bit process due to the overhead of 64-bit arithmetic.
      if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)_length)
      ThrowHelper.ThrowArgumentOutOfRangeException();
       #else 
      if((uint)start>(uint)_length||(uint)length>(uint)(_length-start))
      ThrowHelper.ThrowArgumentOutOfRangeException();
       #endif 
      Metadata
      Metadata
      Assignees
      No one assigned
        Labels
        area-System.Memory
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        No type
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        No projects
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          Relationships
          None yet
          Development
          No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          string.AsSpan(int, int) throws a misleading exception #115239
          Closed as duplicate of#53622
          Closed as duplicate of#53622
          string.AsSpan(int, int) throws a misleading exception#115239
          Labels
          area-System.Memory
          Milestone
          Future
          Description
          @MihaZupan
          MihaZupan
          opened on May 2, 2025
          "foo".AsSpan(0, largeNumber) will throw Specified argument was out of the range of valid values. (Parameter 'start').
          
Note the indicated parameter name. The issue here is the combination of start/length, and there's nothing you can change start to to make this valid as the issue happens to be in the length argument.
          We could consider removing the ExceptionArgument.start, or use a different message that doesn't blame start specifically.
          runtime/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
          
Lines 191 to 207
in
27604b5
          publicstaticReadOnlySpan<char>AsSpan(thisstring?text,intstart,intlength)
          {
          if(text==null)
          {
          if(start!=0||length!=0)
          ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
          returndefault;
          }
           #if TARGET_64BIT
          // See comment in Span<T>.Slice for how this works.
          if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)text.Length)
          ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
           #else 
          if((uint)start>(uint)text.Length||(uint)length>(uint)(text.Length-start))
          ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
           #endif 
          We don't report the argument in Slice(int, int) for example
          runtime/src/libraries/System.Private.CoreLib/src/System/Span.cs
          
Lines 398 to 412
in
27604b5
          publicSpan<T>Slice(intstart,intlength)
          {
           #if TARGET_64BIT
          // Since start and length are both 32-bit, their sum can be computed across a 64-bit domain
          // without loss of fidelity. The cast to uint before the cast to ulong ensures that the
          // extension from 32- to 64-bit is zero-extending rather than sign-extending. The end result
          // of this is that if either input is negative or if the input sum overflows past Int32.MaxValue,
          // that information is captured correctly in the comparison against the backing _length field.
          // We don't use this same mechanism in a 32-bit process due to the overhead of 64-bit arithmetic.
          if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)_length)
          ThrowHelper.ThrowArgumentOutOfRangeException();
           #else 
          if((uint)start>(uint)_length||(uint)length>(uint)(_length-start))
          ThrowHelper.ThrowArgumentOutOfRangeException();
           #endif 
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            area-System.Memory
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            No type
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            No projects
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              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              string.AsSpan(int, int) throws a misleading exception #115239
              Closed as duplicate of#53622
              Closed as duplicate of#53622
              string.AsSpan(int, int) throws a misleading exception#115239
              Labels
              area-System.Memory
              Milestone
              Future
              Description
              @MihaZupan
              MihaZupan
              opened on May 2, 2025
              "foo".AsSpan(0, largeNumber) will throw Specified argument was out of the range of valid values. (Parameter 'start').
              
Note the indicated parameter name. The issue here is the combination of start/length, and there's nothing you can change start to to make this valid as the issue happens to be in the length argument.
              We could consider removing the ExceptionArgument.start, or use a different message that doesn't blame start specifically.
              runtime/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
              
Lines 191 to 207
in
27604b5
              publicstaticReadOnlySpan<char>AsSpan(thisstring?text,intstart,intlength)
              {
              if(text==null)
              {
              if(start!=0||length!=0)
              ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
              returndefault;
              }
               #if TARGET_64BIT
              // See comment in Span<T>.Slice for how this works.
              if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)text.Length)
              ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
               #else 
              if((uint)start>(uint)text.Length||(uint)length>(uint)(text.Length-start))
              ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
               #endif 
              We don't report the argument in Slice(int, int) for example
              runtime/src/libraries/System.Private.CoreLib/src/System/Span.cs
              
Lines 398 to 412
in
27604b5
              publicSpan<T>Slice(intstart,intlength)
              {
               #if TARGET_64BIT
              // Since start and length are both 32-bit, their sum can be computed across a 64-bit domain
              // without loss of fidelity. The cast to uint before the cast to ulong ensures that the
              // extension from 32- to 64-bit is zero-extending rather than sign-extending. The end result
              // of this is that if either input is negative or if the input sum overflows past Int32.MaxValue,
              // that information is captured correctly in the comparison against the backing _length field.
              // We don't use this same mechanism in a 32-bit process due to the overhead of 64-bit arithmetic.
              if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)_length)
              ThrowHelper.ThrowArgumentOutOfRangeException();
               #else 
              if((uint)start>(uint)_length||(uint)length>(uint)(_length-start))
              ThrowHelper.ThrowArgumentOutOfRangeException();
               #endif 
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                area-System.Memory
                Type
                No type
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                No projects
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                  None yet
                  Development
                  No branches or pull requests
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} 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
                  string.AsSpan(int, int) throws a misleading exception #115239
                  Closed as duplicate of#53622
                  Closed as duplicate of#53622
                  string.AsSpan(int, int) throws a misleading exception#115239
                  Labels
                  area-System.Memory
                  Milestone
                  Future
                  Description
                  @MihaZupan
                  MihaZupan
                  opened on May 2, 2025
                  "foo".AsSpan(0, largeNumber) will throw Specified argument was out of the range of valid values. (Parameter 'start').
                  
Note the indicated parameter name. The issue here is the combination of start/length, and there's nothing you can change start to to make this valid as the issue happens to be in the length argument.
                  We could consider removing the ExceptionArgument.start, or use a different message that doesn't blame start specifically.
                  runtime/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
                  
Lines 191 to 207
in
27604b5
                  publicstaticReadOnlySpan<char>AsSpan(thisstring?text,intstart,intlength)
                  {
                  if(text==null)
                  {
                  if(start!=0||length!=0)
                  ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                  returndefault;
                  }
                   #if TARGET_64BIT
                  // See comment in Span<T>.Slice for how this works.
                  if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)text.Length)
                  ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                   #else 
                  if((uint)start>(uint)text.Length||(uint)length>(uint)(text.Length-start))
                  ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                   #endif 
                  We don't report the argument in Slice(int, int) for example
                  runtime/src/libraries/System.Private.CoreLib/src/System/Span.cs
                  
Lines 398 to 412
in
27604b5
                  publicSpan<T>Slice(intstart,intlength)
                  {
                   #if TARGET_64BIT
                  // Since start and length are both 32-bit, their sum can be computed across a 64-bit domain
                  // without loss of fidelity. The cast to uint before the cast to ulong ensures that the
                  // extension from 32- to 64-bit is zero-extending rather than sign-extending. The end result
                  // of this is that if either input is negative or if the input sum overflows past Int32.MaxValue,
                  // that information is captured correctly in the comparison against the backing _length field.
                  // We don't use this same mechanism in a 32-bit process due to the overhead of 64-bit arithmetic.
                  if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)_length)
                  ThrowHelper.ThrowArgumentOutOfRangeException();
                   #else 
                  if((uint)start>(uint)_length||(uint)length>(uint)(_length-start))
                  ThrowHelper.ThrowArgumentOutOfRangeException();
                   #endif 
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    area-System.Memory
                    Type
                    No type
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                    No projects
                      Milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      string.AsSpan(int, int) throws a misleading exception #115239
                      Closed as duplicate of#53622
                      Closed as duplicate of#53622
                      string.AsSpan(int, int) throws a misleading exception#115239
                      Labels
                      area-System.Memory
                      Milestone
                      Future
                      Description
                      @MihaZupan
                      MihaZupan
                      opened on May 2, 2025
                      "foo".AsSpan(0, largeNumber) will throw Specified argument was out of the range of valid values. (Parameter 'start').
                      
Note the indicated parameter name. The issue here is the combination of start/length, and there's nothing you can change start to to make this valid as the issue happens to be in the length argument.
                      We could consider removing the ExceptionArgument.start, or use a different message that doesn't blame start specifically.
                      runtime/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
                      
Lines 191 to 207
in
27604b5
                      publicstaticReadOnlySpan<char>AsSpan(thisstring?text,intstart,intlength)
                      {
                      if(text==null)
                      {
                      if(start!=0||length!=0)
                      ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                      returndefault;
                      }
                       #if TARGET_64BIT
                      // See comment in Span<T>.Slice for how this works.
                      if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)text.Length)
                      ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                       #else 
                      if((uint)start>(uint)text.Length||(uint)length>(uint)(text.Length-start))
                      ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                       #endif 
                      We don't report the argument in Slice(int, int) for example
                      runtime/src/libraries/System.Private.CoreLib/src/System/Span.cs
                      
Lines 398 to 412
in
27604b5
                      publicSpan<T>Slice(intstart,intlength)
                      {
                       #if TARGET_64BIT
                      // Since start and length are both 32-bit, their sum can be computed across a 64-bit domain
                      // without loss of fidelity. The cast to uint before the cast to ulong ensures that the
                      // extension from 32- to 64-bit is zero-extending rather than sign-extending. The end result
                      // of this is that if either input is negative or if the input sum overflows past Int32.MaxValue,
                      // that information is captured correctly in the comparison against the backing _length field.
                      // We don't use this same mechanism in a 32-bit process due to the overhead of 64-bit arithmetic.
                      if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)_length)
                      ThrowHelper.ThrowArgumentOutOfRangeException();
                       #else 
                      if((uint)start>(uint)_length||(uint)length>(uint)(_length-start))
                      ThrowHelper.ThrowArgumentOutOfRangeException();
                       #endif 
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        area-System.Memory
                        Type
                        No type
                        Projects
                        No projects
                          Milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          string.AsSpan(int, int) throws a misleading exception #115239
                          Closed as duplicate of#53622
                          Closed as duplicate of#53622
                          string.AsSpan(int, int) throws a misleading exception#115239
                          Labels
                          area-System.Memory
                          Milestone
                          Future
                          Description
                          @MihaZupan
                          MihaZupan
                          opened on May 2, 2025
                          "foo".AsSpan(0, largeNumber) will throw Specified argument was out of the range of valid values. (Parameter 'start').
                          
Note the indicated parameter name. The issue here is the combination of start/length, and there's nothing you can change start to to make this valid as the issue happens to be in the length argument.
                          We could consider removing the ExceptionArgument.start, or use a different message that doesn't blame start specifically.
                          runtime/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
                          
Lines 191 to 207
in
27604b5
                          publicstaticReadOnlySpan<char>AsSpan(thisstring?text,intstart,intlength)
                          {
                          if(text==null)
                          {
                          if(start!=0||length!=0)
                          ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                          returndefault;
                          }
                           #if TARGET_64BIT
                          // See comment in Span<T>.Slice for how this works.
                          if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)text.Length)
                          ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                           #else 
                          if((uint)start>(uint)text.Length||(uint)length>(uint)(text.Length-start))
                          ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                           #endif 
                          We don't report the argument in Slice(int, int) for example
                          runtime/src/libraries/System.Private.CoreLib/src/System/Span.cs
                          
Lines 398 to 412
in
27604b5
                          publicSpan<T>Slice(intstart,intlength)
                          {
                           #if TARGET_64BIT
                          // Since start and length are both 32-bit, their sum can be computed across a 64-bit domain
                          // without loss of fidelity. The cast to uint before the cast to ulong ensures that the
                          // extension from 32- to 64-bit is zero-extending rather than sign-extending. The end result
                          // of this is that if either input is negative or if the input sum overflows past Int32.MaxValue,
                          // that information is captured correctly in the comparison against the backing _length field.
                          // We don't use this same mechanism in a 32-bit process due to the overhead of 64-bit arithmetic.
                          if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)_length)
                          ThrowHelper.ThrowArgumentOutOfRangeException();
                           #else 
                          if((uint)start>(uint)_length||(uint)length>(uint)(_length-start))
                          ThrowHelper.ThrowArgumentOutOfRangeException();
                           #endif 
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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                              string.AsSpan(int, int) throws a misleading exception #115239
                              Closed as duplicate of#53622
                              Closed as duplicate of#53622
                              string.AsSpan(int, int) throws a misleading exception#115239
                              Labels
                              area-System.Memory
                              Milestone
                              Future
                              Description
                              @MihaZupan
                              MihaZupan
                              opened on May 2, 2025
                              "foo".AsSpan(0, largeNumber) will throw Specified argument was out of the range of valid values. (Parameter 'start').
                              
Note the indicated parameter name. The issue here is the combination of start/length, and there's nothing you can change start to to make this valid as the issue happens to be in the length argument.
                              We could consider removing the ExceptionArgument.start, or use a different message that doesn't blame start specifically.
                              runtime/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
                              
Lines 191 to 207
in
27604b5
                              publicstaticReadOnlySpan<char>AsSpan(thisstring?text,intstart,intlength)
                              {
                              if(text==null)
                              {
                              if(start!=0||length!=0)
                              ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                              returndefault;
                              }
                               #if TARGET_64BIT
                              // See comment in Span<T>.Slice for how this works.
                              if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)text.Length)
                              ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                               #else 
                              if((uint)start>(uint)text.Length||(uint)length>(uint)(text.Length-start))
                              ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
                               #endif 
                              We don't report the argument in Slice(int, int) for example
                              runtime/src/libraries/System.Private.CoreLib/src/System/Span.cs
                              
Lines 398 to 412
in
27604b5
                              publicSpan<T>Slice(intstart,intlength)
                              {
                               #if TARGET_64BIT
                              // Since start and length are both 32-bit, their sum can be computed across a 64-bit domain
                              // without loss of fidelity. The cast to uint before the cast to ulong ensures that the
                              // extension from 32- to 64-bit is zero-extending rather than sign-extending. The end result
                              // of this is that if either input is negative or if the input sum overflows past Int32.MaxValue,
                              // that information is captured correctly in the comparison against the backing _length field.
                              // We don't use this same mechanism in a 32-bit process due to the overhead of 64-bit arithmetic.
                              if((ulong)(uint)start+(ulong)(uint)length>(ulong)(uint)_length)
                              ThrowHelper.ThrowArgumentOutOfRangeException();
                               #else 
                              if((uint)start>(uint)_length||(uint)length>(uint)(_length-start))
                              ThrowHelper.ThrowArgumentOutOfRangeException();
                               #endif 
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