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doc(builtin-dep): Document the builtin package ID spec format #17564

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weihanglo merged 1 commit into from
Oct 8, 2026
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doc(builtin-dep): Document the builtin package ID spec format #17564

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4 changes: 4 additions & 0 deletions doc/book/src/reference/unstable.md
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Expand Up @@ -1960,6 +1960,10 @@ core = { builtin = true}
Specifying builtin dependencies explicitly pairs well with `-Zbuild-std` and is
also useful for `#[no_std]` crates. See the RFC for further details.

The Package ID specification can refer to builtin packages using the form
`builtin://.#<name>`. For example, `builtin://.#core` identifies the builtin
core package, distinguishing it from packages named "core" from other sources.

# Stabilized and removed features

## Compile progress
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