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carbon-lang

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Use when evaluating Carbon for a C++ code base, running the carbon toolchain from a nightly or Bazel build, or comparing Carbon with staying on C++. Not for C++ modules: use cpp-modules.

.devin/skills/carbon-lang/SKILL.md

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Sep 28, 2026
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# Carbon

Carbon is an experimental successor language to C++ from the carbon-language project. As of 2026-09-05 there is no 1.0 and no 0.1: the 0.1 milestone is the minimum language for evaluation, and the 2025 roadmap revision moved its earliest realistic date to the end of 2026 after memory-safety design was added to its scope. The only downloads are nightly toolchain tarballs tagged `v0.0.0-0.nightly.YYYY.MM.DD`, on limited platforms. Treat every finding below as dated to the nightly you ran.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A team with a large C++ code base asks whether to evaluate Carbon, wants to run the toolchain, wants to call C++ from Carbon, or asks how Carbon's safety model and readiness compare with C++. |
| Authority | Reversible local: writes only the toolchain checkout or extracted nightly tarball, Carbon source files, and `--output` artifacts in the working directory; rollback is deleting them. No remote mutation. |
| Side effect | A Bazel build of the toolchain compiles a pinned LLVM commit and takes substantial disk and time. |
| Done | The evaluation report states the nightly date or commit used, what compiled and what did not, and a decision (evaluate further or stay on C++) tied to the constraints in step 7. |

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