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name mangling

How the compiler renames functions to encode extra information, which C can't read.

Rust mangles symbol names to encode paths and generics; #[unsafe(no_mangle)] keeps the plain name so C code can link to the function.

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Examples

  • #[unsafe(no_mangle)] keeps parcel_cost under its own name so C can link to it; in edition 2024 the bare #[no_mangle] is an error.

See also

ABI foreign function interface linker
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