Nightly build 2026.04.21

What's Changed

Toolchain and implementation changes 🛠️

• Switch to conventionally use a name parameter for a macro by @chandlerc in #7053
• fixed a crash when lowering a ref return initialized by value expression by @yntfwyk in #7049
• Support C++ calling Carbon functions with non-() return type by @nicholasbishop in #7051
• Preliminary reverse interop support for base classes. by @zygoloid in #7059
• Allow non-constant calls to constexpr functions. by @zygoloid in #7067
• Revert accidental change from #7036 by @geoffromer in #7069
• Test and fix make-variable expansion in our toolchains by @chandlerc in #7070
• Remove duplicate file and fix to include the bin directory by @chandlerc in #7073
• Compute type layouts in SemIR / Check by @zygoloid in #7066
• Track declared form with an InstId instead of a ConstantId. by @geoffromer in #7072
• Get rid of AddPatternInst by @geoffromer in #7075
• Override Clang class layout for Carbon class types. by @zygoloid in #7071
• Restructure action-dependence APIs by @geoffromer in #7074
• Make heterogenous hash table lookup opt-in by @dwblaikie in #6950
• Preserve ErrorInst in TryGetTypeIdForTypeConstantId by @danakj in #7079
• Add bootstrapping flags to the build system by @chandlerc in #7084

Infrastructure changes 🏗️

• Pull in a fix to the new compile commands system by @chandlerc in #7068
• Add a Bazel skill by @chandlerc in #7061
• Update the name of the bazel target to build the nightly tarball by @danakj in #7080

Full Changelog: v0.0.0-0.nightly.2026.04.15...v0.0.0-0.nightly.2026.04.21

Nightly build 2026.04.15

What's Changed

Toolchain and implementation changes 🛠️

• Switch from Bazel platforms to build settings by @chandlerc in #7052

Documentation changes 📝

• Fully switch to the new compilation database system by @chandlerc in #7057

Infrastructure changes 🏗️

• Remove the leading /proc/self/cwd/ from file paths in the debug info. by @geoffromer in #7060

Full Changelog: v0.0.0-0.nightly.2026.04.14...v0.0.0-0.nightly.2026.04.15

Nightly build 2026.04.14

What's Changed

Toolchain and implementation changes 🛠️

• consistently uses the caller's specific to get the callee's pattern type id by @cjdb in #7036
• Only export each class or namespace to C++ once. by @zygoloid in #7042
• Use the raw import ID, not the tagged ID, as an array index. by @zygoloid in #7058
• Reverse interop support for type aliases. by @zygoloid in #7043

Full Changelog: v0.0.0-0.nightly.2026.04.11...v0.0.0-0.nightly.2026.04.14

Nightly build 2026.04.13

What's Changed

Toolchain and implementation changes 🛠️

• Add where T impls X constraints into the FacetTypeInfo by @danakj in #7038
• Include extended named constraints in the type of .Self for a where clause by @danakj in #7048

Full Changelog: v0.0.0-0.nightly.2026.04.10...v0.0.0-0.nightly.2026.04.13

Nightly build 2026.04.12

What's Changed

Toolchain and implementation changes 🛠️

• Add where T impls X constraints into the FacetTypeInfo by @danakj in #7038
• Include extended named constraints in the type of .Self for a where clause by @danakj in #7048

Full Changelog: v0.0.0-0.nightly.2026.04.10...v0.0.0-0.nightly.2026.04.12

Nightly build 2026.04.11

What's Changed

Toolchain and implementation changes 🛠️

• Add where T impls X constraints into the FacetTypeInfo by @danakj in #7038
• Include extended named constraints in the type of .Self for a where clause by @danakj in #7048

Full Changelog: v0.0.0-0.nightly.2026.04.10...v0.0.0-0.nightly.2026.04.11

Nightly build 2026.04.10

What's Changed

Toolchain and implementation changes 🛠️

• Remove SymbolicBinding step in TypeIterator by @danakj in #7039
• Fix missing runtimes file in the installation by @chandlerc in #7044

Infrastructure changes 🏗️

• Add ASan to post-merge CI and improve the action structure for GitHub by @chandlerc in #7012

Full Changelog: v0.0.0-0.nightly.2026.04.09...v0.0.0-0.nightly.2026.04.10

Nightly build 2026.04.09

What's Changed

Toolchain and implementation changes 🛠️

• Superficial support for exporting complete class types to C++. by @zygoloid in #7029
• Avoid crashing in custom witness for FacetTypes and symbolic object representations by @danakj in #7033
• Give Carbon -> C++ thunks internal linkage. by @zygoloid in #7040

Utilities 📐

• Bump vscode extension to 0.0.8. by @zygoloid in #7041

Other changes

• Bump addressable from 2.8.7 to 2.9.0 in /website in the bundler group across 1 directory by @dependabot[bot] in #7037

Full Changelog: v0.0.0-0.nightly.2026.04.08...v0.0.0-0.nightly.2026.04.09

Nightly build 2026.04.08

What's Changed

Toolchain and implementation changes 🛠️

• Support round-tripping entities through C++ and Carbon. by @zygoloid in #7022
• Refactor WhereExpr evaluation into smaller helper functions by @danakj in #7006
• Remove TODO in impl lookup for discarding unused witnesses by @danakj in #7032
• Resolve the specific definition for a function that is evaluated by @danakj in #7034
• Add support for C++ calling Carbon functions with parameters by @nicholasbishop in #7024
• Fix malformed split by @geoffromer in #7035

Full Changelog: v0.0.0-0.nightly.2026.04.07...v0.0.0-0.nightly.2026.04.08

Nightly build 2026.04.07

What's Changed

Utilities 📐

• Update tree_sitter for the new self syntax and static var by @chandlerc in #7025
• Add the static keyword to various syntax highlighting by @chandlerc in #7026

Full Changelog: v0.0.0-0.nightly.2026.04.04...v0.0.0-0.nightly.2026.04.07