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[release/10.0.4xx] Restore legacy cross-assembly inline metadata - #20267
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Regression fixture: LegacyInline.dll built with .NET SDK 10.0.105 (F# compiler without ValInline.InlinedDefinition). That compiler used the pre-InlinedDefinition encoding where ValInline.Always = 0x00 bits. The current compiler reads 0x00 as InlinedDefinition (ShouldInline=false). With --optimize-, crossAssemblyOpt() returns false and ShouldInline=false, so the body is never fetched; the optimizer emits a direct IL call instead of the inlined form expected for an `inline` function. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Replace the arithmetic-only `increment` fixture with a cross-assembly inline SRTP function whose compiled (non-inlined) fallback body is the compiler-generated "Dynamic invocation of Invoke is not supported" placeholder, matching the shape of the real-world regression (issue 20253, Aether's op_HatEquals). LegacyInline.dll is regenerated from the updated LegacyInline.fs with the official .NET SDK 10.0.105 F# compiler. The test now exercises Release/optimized codegen (withOptimize) and compiles+runs the consumer, asserting no direct call to the placeholder remains in the imported IL. Note: exhaustive testing against SDK 10.0.100/10.0.105/10.0.203/10.0.301 shows none of these official compilers actually emit the ambiguous zero-bit ValInline encoding for this shape (SRTP trait resolution and witness-passing both resolve the call at the consumer's type-check time, independent of the ShouldInline metadata bit), so this fixture does not currently reproduce a failing run against HEAD. It does correctly validate the cross-assembly SRTP import path and regresses if a future change reintroduces a direct call to the placeholder body. Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Build LegacyInline.dll with the official .NET SDK 3.1.100 F# compiler (10.7.0.0 for F# 4.7), which predates witness metadata and preserves the legacy inline encoding. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Refactor Issue 20253 test to focus on IL verification, removing runtime execution that doesn't contribute to the regression contract. The test now compiles as a library and verifies that the legacy inline metadata from LegacyInline.dll is properly inlined, preventing the direct call to LegacyInline.Library::invoke from appearing in the emitted IL. This change: - Simplifies Consumer module from EntryPoint program to library function - Removes runtime execution verification (run | shouldSucceed | verifyOutputContains) - Retains compile success verification (shouldSucceed) - Maintains IL regression assertion (verifyILNotPresent [ "LegacyInline.Library::invoke" ]) The IL assertion is the actual regression contract for this issue. Co-authored-by: Copilot <copilot@example.com>
u_ValData deserialized ValFlags directly from the pickled int64, so DLLs written by compilers <= 4.7 (pre-witness), which encoded PseudoVal/Always inline info as all-zero inline bits, were imported as ValInline.InlinedDefinition after PR #19548 repurposed the same 0x00 bits for that case. Add ValFlags.OfPickledBits, mirroring the InlinedDefinition -> Always normalization PickledBits already applies on write, and use it in u_ValData so legacy zero-bit values import as Always (ShouldInline=true) regardless of which compiler wrote them. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Compile the Issue 20253 consumer out-of-process via runFscProcess instead of CompilerAssert.CompileRaw in-process. The in-process path can mutate shared compiler/import state across tests sharing the same process, so keep this legacy pre-witness FSharp.Core regression check at the IL boundary without touching the test host's own state. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Tomas Grosup <Tomas.Grosup@gmail.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d9bb5fd2-ae26-4369-934d-1bae177a1266
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d9bb5fd2-ae26-4369-934d-1bae177a1266
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: d9bb5fd2-ae26-4369-934d-1bae177a1266
The Check_Published_Package_Versions FSCore leg restores FSharp.Core at the version in eng/Versions.props and fails when the restore succeeds, meaning that version is already on nuget.org. FSharp.Core 10.1.400 has now been published, so bump FSBuildVersion 400 -> 401 to the next free servicing version. FCS moves to 43.13.401 (also unpublished). Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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abonie
approved these changes
Aug 17, 2026
T-Gro
enabled auto-merge (squash)
August 19, 2026 06:32
abonie
approved these changes
Aug 19, 2026
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Backport of #20260 to release/10.0.4xx
/cc @T-Gro
Note: Release notes and
eng/commonfiles are excluded from this backport. If release notes are needed, they should be added manually to the appropriate version file for this branch.Customer Impact
Testing
Risk
IMPORTANT: Is this backport for a servicing release? If so and this change touches code that ships in a NuGet package, please make certain that you have added any necessary package authoring and gotten it explicitly reviewed.