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merged 2 commits into from
May 10, 2022
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Stop saying that const functions cannot use 'extern' #1207

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921ed7c
Stop saying that const functions cannot use 'extern'
mattheww May 7, 2022
dd32a8e
Say that `const extern` functions can only use "Rust" or "C"
mattheww May 9, 2022
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6 changes: 4 additions & 2 deletions src/items/functions.md
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Expand Up @@ -216,8 +216,9 @@ Functions qualified with the `const` keyword are [const functions], as are
[tuple struct] and [tuple variant] constructors. _Const functions_ can be
called from within [const contexts].

Const functions are not allowed to be [async](#async-functions), and cannot
use the [`extern` function qualifier](#extern-function-qualifier).
Const functions may use the [`extern`] function qualifier, but only with the `"Rust"` and `"C"` ABIs.

Const functions are not allowed to be [async](#async-functions).

## Async functions

Expand Down Expand Up @@ -383,6 +384,7 @@ fn foo_oof(#[some_inert_attribute] arg: u8) {
[const functions]: ../const_eval.md#const-functions
[tuple struct]: structs.md
[tuple variant]: enumerations.md
[`extern`]: #extern-function-qualifier
[external block]: external-blocks.md
[path]: ../paths.md
[block]: ../expressions/block-expr.md
Expand Down