carbon-language/carbon-lang v0.0.0-0.nightly.2025.10.21

Nightly build 2025.10.21

on GitHub

What's Changed

Proposals accepted and merged 📜

• C++ Interop: Mapping std::string_view to Core.Str by @bricknerb in #6177

Toolchain and implementation changes 🛠️

• Switch EvalLookupSingleImplWitness from "concrete" to "final" terminology by @jonmeow in #6246
• Avoid mismatched InterfaceId comparison between two files by @dwblaikie in #6241
• Add unit tagging to SpecificId by @dwblaikie in #6251
• Add unit tagging to InterfaceId by @dwblaikie in #6243

Infrastructure changes 🏗️

• Fix up some comments related to the change to hex ids by @dwblaikie in #6247

Full Changelog: v0.0.0-0.nightly.2025.10.18...v0.0.0-0.nightly.2025.10.21