doc: mention that intrinsics should not be called in user code #142439
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RalfJung
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Jun 13, 2025
Intrinsic functions declared in `std::intrinsics` are an implementation detail and should not be called directly by the user. The compiler explicitly warns against their use in user code: ``` warning: the feature `core_intrinsics` is internal to the compiler or standard library --> src/lib.rs:1:12 | 1 | #![feature(core_intrinsics)] | ^^^^^^^^^^^^^^^ | = note: using it is strongly discouraged = note: `#[warn(internal_features)]` on by default ``` [**Playground link**] This PR documents what the compiler warning says: these intrinsics should not be called outside the standard library. [**Playground link**]: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2024&gist=1c893b0698291f550bbdde0151fd221b
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Looks good, thanks! @bors r+ rollup |
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Rollup of 16 pull requests Successful merges: - #140969 (Allow initializing logger with additional tracing Layer) - #141352 (builtin dyn impl no guide inference) - #142046 (add Vec::peek_mut) - #142273 (tests: Minicore `extern "gpu-kernel"` feature test) - #142302 (Rework how the disallowed qualifier in function type diagnostics are generated) - #142405 (Don't hardcode the intrinsic return types twice in the compiler) - #142434 ( Pre-install JS dependencies in tidy Dockerfile) - #142439 (doc: mention that intrinsics should not be called in user code) - #142441 (Delay replacing escaping bound vars in `FindParamInClause`) - #142449 (Require generic params for const generic params) - #142452 (Remove "intermittent" wording from `ReadDir`) - #142459 (Remove output helper bootstrap) - #142460 (cleanup search graph impl) - #142461 (compiletest: Clarify that `--no-capture` is needed with `--verbose`) - #142475 (Add platform support docs & maintainers for *-windows-msvc) - #142480 (tests: Convert two handwritten minicores to add-core-stubs) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of #142439 - scrabsha:rust/sasha/uwkqrkztvqry, r=RalfJung doc: mention that intrinsics should not be called in user code Intrinsic functions declared in `std::intrinsics` are an implementation detail and should not be called directly by the user. The compiler explicitly warns against their use in user code: ``` warning: the feature `core_intrinsics` is internal to the compiler or standard library --> src/lib.rs:1:12 | 1 | #![feature(core_intrinsics)] | ^^^^^^^^^^^^^^^ | = note: using it is strongly discouraged = note: `#[warn(internal_features)]` on by default ``` [**Playground link**] This PR documents what the compiler warning says: these intrinsics should not be used in user code. [**Playground link**]: https://play.rust-lang.org/?version=nightly&mode=debug&edition=2024&gist=1c893b0698291f550bbdde0151fd221b
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Intrinsic functions declared in
std::intrinsicsare an implementation detail and should not be called directly by the user. The compiler explicitly warns against their use in user code:Playground link
This PR documents what the compiler warning says: these intrinsics should not be used in user code.