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Add error explanation for E0755
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,28 @@ | ||
The `ffi_pure` attribute was used on a non-foreign function. | ||
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Erroneous code example: | ||
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```compile_fail,E0755 | ||
#![feature(ffi_pure)] | ||
#[ffi_pure] // error! | ||
pub fn foo() {} | ||
# fn main() {} | ||
``` | ||
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The `ffi_pure` attribute can only be used on foreign functions which do not have | ||
side effects or infinite loops: | ||
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``` | ||
#![feature(ffi_pure)] | ||
extern "C" { | ||
#[ffi_pure] // ok! | ||
pub fn strlen(s: *const i8) -> isize; | ||
} | ||
# fn main() {} | ||
``` | ||
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You can find more information about it in the [unstable Rust Book]. | ||
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[unstable Rust Book]: https://doc.rust-lang.org/unstable-book/language-features/ffi-pure.html |
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