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Add suggestion to borrow when casting T to *const/mut T

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This commit is contained in:
Giacomo Stevanato 2021-04-15 23:17:15 +02:00
parent 60158f4a7c
commit 2899b58832
1 changed files with 15 additions and 0 deletions
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15
compiler/rustc_typeck/src/check/cast.rs
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@ -359,6 +359,21 @@ impl<'a, 'tcx> CastCheck<'tcx> {
{
sugg = Some(format!("&{}", mutbl.prefix_str()));
}
} else if let ty::RawPtr(TypeAndMut { mutbl, .. }) = *self.cast_ty.kind() {
if fcx
.try_coerce(
self.expr,
fcx.tcx.mk_ref(
&ty::RegionKind::ReErased,
TypeAndMut { ty: self.expr_ty, mutbl },
),
self.cast_ty,
AllowTwoPhase::No,
)
.is_ok()
{
sugg = Some(format!("&{}", mutbl.prefix_str()));
}
}
if let Some(sugg) = sugg {
err.span_label(self.span, "invalid cast");