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errors: implement IntoDiagnosticArg for &T

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Implement `IntoDiagnosticArg` for `&'a T` when `T` implements
`IntoDiagnosticArg` and `Clone`. Makes it easier to write diagnostic
structs that borrow something which implements `IntoDiagnosticArg`.

Signed-off-by: David Wood <david.wood@huawei.com>
This commit is contained in:
David Wood 2022-08-30 17:00:20 +01:00
parent 59cc5e5d59
commit f7b42102e6
3 changed files with 13 additions and 13 deletions
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6
compiler/rustc_errors/src/diagnostic_impls.rs
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@ -36,6 +36,12 @@ impl<'a, T: fmt::Display> From<&'a T> for DiagnosticArgFromDisplay<'a> {
}
}
impl<'a, T: Clone + IntoDiagnosticArg> IntoDiagnosticArg for &'a T {
fn into_diagnostic_arg(self) -> DiagnosticArgValue<'static> {
self.clone().into_diagnostic_arg()
}
}
macro_rules! into_diagnostic_arg_using_display {
($( $ty:ty ),+ $(,)?) => {
$(