Nightly build 2024.12.25

What's Changed

Toolchain and implementation changes 🛠️

• Model type expressions as regions by @geoffromer in #4698
• Fix a protected data member in a test. by @zygoloid in #4717
• Provide generic impls for Core.Int and Core.UInt operations. by @zygoloid in #4693
• Fix syntactic match of impl decl to definition by @josh11b in #4709
• Replace #4505 with a different set of workarounds by @chandlerc in #4527
• Teach the SIMD metadata group match to defer masking by @chandlerc in #4595
• Fix a clang-tidy issue by @chandlerc in #4723
• Avoid recursion in InstNamer::CollectNamesInBlock by @danakj in #4706
• Remove stale comment by @josh11b in #4727
• Require a definition in the same file as an impl declaration by @josh11b in #4719
• has_definition_started accessor for entities by @josh11b in #4730
• Remove explorer's proto fuzzer and proto dependencies by @jonmeow in #4731
• Fix handling of repeated tuple indexing. by @zygoloid in #4733
• Clarify the logic for invalid impl redeclarations by @josh11b in #4738

Documentation changes 📝

• Solution for advent of code day 2. by @zygoloid in #4708
• Solution for advent of code day 3. by @zygoloid in #4713

Utilities 📐

• Extension version bump and npm update for a release of #4527 by @jonmeow in #4722
• Fix VSCode language extension configuration instructions by @josh11b in #4725

Infrastructure changes 🏗️

• Enable libc++ and LLVM pretty printers for gdb by @dwblaikie in #4715
• Enable strict action env by @jonmeow in #4728
• Fix path to carbon binary in nightly builder by @danakj in #4737

Full Changelog: v0.0.0-0.nightly.2024.12.19...v0.0.0-0.nightly.2024.12.25