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Document `//@ needs-target-std` in rustc-dev-guide

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Jieyou Xu 2025-06-10 22:17:57 +08:00
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@ -202,6 +202,7 @@ settings:
`//@ needs-crate-type: cdylib, proc-macro` will cause the test to be ignored
on `wasm32-unknown-unknown` target because the target does not support the
`proc-macro` crate type.
- `needs-target-std` — ignores if target platform does not have std support.
The following directives will check LLVM support: