bjoernager/rust
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Allow dyn* upcasting

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This commit is contained in:
Michael Goulet 2022-09-14 23:28:14 +00:00
parent 76386bd65e
commit feb4244f54
4 changed files with 97 additions and 36 deletions
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12
compiler/rustc_hir_analysis/src/check/coercion.rs
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@ -764,8 +764,16 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
{
if a_data.principal_def_id() == b_data.principal_def_id() {
return self.unify_and(a, b, |_| vec![]);
} else {
bug!("dyn* trait upcasting is not supported");
} else if !self.tcx().features().trait_upcasting {
let mut err = feature_err(
&self.tcx.sess.parse_sess,
sym::trait_upcasting,
self.cause.span,
&format!(
"cannot cast `{a}` to `{b}`, trait upcasting coercion is experimental"
),
);
err.emit();
}
}