Nightly build 2025.08.09

What's Changed

Toolchain and implementation changes 🛠️

• Rename cpp_ast to clang_ast_unit by @bricknerb in #5926
• Avoid readability-function-size clang-tidy checks on Stringify() by @bricknerb in #5933
• Compare ImplWitnessAccess into Self as canonical constants by @danakj in #5883
• Allow dumping with a Parse::Context by @danakj in #5936
• Use canonical constant values as the keys for ImplWitnessAccess in AccessRewriteValues by @danakj in #5912
• Implement initialization for C++ thunk parameters. by @zygoloid in #5938

Infrastructure changes 🏗️

• Don't require writing a return type on lambdas by @danakj in #5935

Full Changelog: v0.0.0-0.nightly.2025.08.08...v0.0.0-0.nightly.2025.08.09

Nightly build 2025.08.08

What's Changed

Toolchain and implementation changes 🛠️

• Create clang::MangleContext once per file instead of once per C++ thunk by @bricknerb in #5924
• Add a flag to dump the C++ AST by @bricknerb in #5918

Infrastructure changes 🏗️

• Simpler regex for a multi-line capture group by @danakj in #5925

Full Changelog: v0.0.0-0.nightly.2025.08.07...v0.0.0-0.nightly.2025.08.08

Nightly build 2025.08.07

What's Changed

Toolchain and implementation changes 🛠️

• Generate and use a C++ thunk to call non simple ABI C++ functions by @bricknerb in #5850
• Import C++ constructors of class Type fn Type(...) -> Type by @bricknerb in #5879
• Import symbolic vtable entries as attached constants by @dwblaikie in #5871
• Add some tests for .Self in the interface params, and comments about implied constraints by @danakj in #5919
• Support parse/check/lower for char by @jonmeow in #5901
• Use GetStructType when building object repr structs by @jonmeow in #5923

Utilities 📐

• Bump tmp from 0.2.3 to 0.2.4 in /utils/vscode in the npm_and_yarn group across 1 directory by @dependabot[bot] in #5921

Full Changelog: v0.0.0-0.nightly.2025.08.06...v0.0.0-0.nightly.2025.08.07

Nightly build 2025.08.06

What's Changed

Toolchain and implementation changes 🛠️

• Add missing Cpp. to unsupported decl type test by @bricknerb in #5907
• Don't use struct literals in tests by @bricknerb in #5906
• Remove two todos in facet_type.cpp by @danakj in #5908
• Remove clang prefixes from isa/cast when optional by @jonmeow in #5909
• Don't use Check::Context when emitting C++ diagnostics. by @zygoloid in #5910
• Rename FloatLiteral to FloatValue. by @zygoloid in #5911
• Support import Cpp inline "some code";. by @zygoloid in #5904

Full Changelog: v0.0.0-0.nightly.2025.08.05...v0.0.0-0.nightly.2025.08.06

Nightly build 2025.08.05

What's Changed

Toolchain and implementation changes 🛠️

• Generate Destroy impls for classes by @jonmeow in #5873

Full Changelog: v0.0.0-0.nightly.2025.08.02...v0.0.0-0.nightly.2025.08.05

Nightly build 2025.08.04

What's Changed

Proposals accepted and merged 📜

• ref parameters, arguments, returns and val returns by @josh11b in #5434

Toolchain and implementation changes 🛠️

• Move and deduplicate testing access when a Carbon class extends a C++ record to access.carbon by @bricknerb in #5897
• Add prelude impl of Iterate for array types. by @zygoloid in #5895
• Document pattern-matching implementation by @geoffromer in #5846
• Support lexing characters by @jonmeow in #5893
• Docs for specific coalescing. by @alinas in #5886
• More tests for early rewrite application and implied constraints by @danakj in #5892

Other changes

• Verify rewrite constraints in impl lookup by @danakj in #5617

Full Changelog: v0.0.0-0.nightly.2025.08.01...v0.0.0-0.nightly.2025.08.04

Nightly build 2025.08.03

What's Changed

Proposals accepted and merged 📜

• ref parameters, arguments, returns and val returns by @josh11b in #5434

Toolchain and implementation changes 🛠️

• Move and deduplicate testing access when a Carbon class extends a C++ record to access.carbon by @bricknerb in #5897
• Add prelude impl of Iterate for array types. by @zygoloid in #5895
• Document pattern-matching implementation by @geoffromer in #5846
• Support lexing characters by @jonmeow in #5893
• Docs for specific coalescing. by @alinas in #5886
• More tests for early rewrite application and implied constraints by @danakj in #5892

Other changes

• Verify rewrite constraints in impl lookup by @danakj in #5617

Full Changelog: v0.0.0-0.nightly.2025.08.01...v0.0.0-0.nightly.2025.08.03

Nightly build 2025.08.02

What's Changed

Proposals accepted and merged 📜

• ref parameters, arguments, returns and val returns by @josh11b in #5434

Toolchain and implementation changes 🛠️

• Move and deduplicate testing access when a Carbon class extends a C++ record to access.carbon by @bricknerb in #5897
• Add prelude impl of Iterate for array types. by @zygoloid in #5895
• Document pattern-matching implementation by @geoffromer in #5846
• Support lexing characters by @jonmeow in #5893
• Docs for specific coalescing. by @alinas in #5886
• More tests for early rewrite application and implied constraints by @danakj in #5892

Other changes

• Verify rewrite constraints in impl lookup by @danakj in #5617

Full Changelog: v0.0.0-0.nightly.2025.08.01...v0.0.0-0.nightly.2025.08.02

Nightly build 2025.08.01

What's Changed

Toolchain and implementation changes 🛠️

• Improve mapping of Clang diagnostics into Carbon diagnostics by @zygoloid in #5894

Full Changelog: v0.0.0-0.nightly.2025.07.31...v0.0.0-0.nightly.2025.08.01

Nightly build 2025.07.31

What's Changed

Toolchain and implementation changes 🛠️

• Add support for using C++ double type in imported function declarations by @bricknerb in #5868
• Resolve nested accesses in rewrite constraints by @danakj in #5872
• Fix diagnostic for access of protected/private base member. by @zygoloid in #5874
• Don't ignore SemIR ranges in C++ interop tests by @bricknerb in #5877
• Fix crash when importing an invalid impl by @jonmeow in #5875
• Add braces for CARBON_KIND uses that lack them by @jonmeow in #5882
• Fix the tests for forward declared union pointer as return type by making the return type pointer _Nonnull by @bricknerb in #5878
• Switch handling of errors in impls to not build a type structure by @jonmeow in #5881
• Emit diagnostics produced by Clang after the ASTUnit is constructed. by @zygoloid in #5876
• Don't import a C++ class definition until the class is required to be complete. by @zygoloid in #5865
• Add some tests for constraints depending on resolving other constraints by @danakj in #5885
• Improve source location in an import error. by @zygoloid in #5887

Full Changelog: v0.0.0-0.nightly.2025.07.30...v0.0.0-0.nightly.2025.07.31