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Note why rust-call abi requires sized obl

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This commit is contained in:
Michael Goulet 2023-05-23 18:15:00 +00:00
parent b7095f5572
commit b95ea45a60
2 changed files with 8 additions and 1 deletions
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8
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -2663,9 +2663,15 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
| ObligationCauseCode::LetElse
| ObligationCauseCode::BinOp { .. }
| ObligationCauseCode::AscribeUserTypeProvePredicate(..)
| ObligationCauseCode::RustCall
| ObligationCauseCode::DropImpl
| ObligationCauseCode::ConstParam(_) => {}
ObligationCauseCode::RustCall => {
if let Some(pred) = predicate.to_opt_poly_trait_pred()
&& Some(pred.def_id()) == self.tcx.lang_items().sized_trait()
{
err.note("argument required to be sized due to `extern \"rust-call\"` ABI");
}
}
ObligationCauseCode::SliceOrArrayElem => {
err.note("slice and array elements must have `Sized` type");
}

1
tests/ui/unsized-locals/rust-call.stderr
View File

@ -6,6 +6,7 @@ LL | f(*slice);
|
= help: within `([u8],)`, the trait `Sized` is not implemented for `[u8]`
= note: required because it appears within the type `([u8],)`
= note: argument required to be sized due to `extern "rust-call"` ABI
error: aborting due to previous error