[Individual PRs to follow] C++ standard support: C++11 through C++26 parser, type-checker, and STL improvements#8878

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tautschnig:cpp11-parser-rework-squashed

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Commits on Apr 28, 2026

Commits on Apr 29, 2026

Fix filesystem crash: skip nil array sizes, handle nil this_expr

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Fix iostream extern, stl1 crash, filesystem array: 20/22 MSVC headers pass

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Promote STL1 and STL2 from KNOWNBUG to CORE

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Expand MSVC artifacts for all 23 failing tests, promote STL1/STL2

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Fix 7 MSVC CI failures: increase memlimit, fix test patterns

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Add type info to binary relation validate error message

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Handle Clang _Nonnull/_Nullable in C++ mode, add validate diagnostics

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Fix equality type mismatch crash, handle _Nonnull in C++

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Elaborate class template after id_map scope entry in resolver

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Skip re-typechecking resolved struct_tag types in template args

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Enable destructibility intrinsics in all C++ modes, add MSVC builtins

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Skip re-elaboration of non-empty template class instances

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Commits on Apr 30, 2026

Commits on May 1, 2026

Commits on May 2, 2026

Re-check symbol completeness before instantiation

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Commits on May 3, 2026

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Commits on May 15, 2026