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implement point_at_index_if_possible

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This commit is contained in:
Takayuki Maeda
2022-07-29 14:12:17 +09:00
parent 1d4ddab1bf
commit 06f89b7924
1 changed files with 17 additions and 11 deletions
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compiler/rustc_typeck/src/check/expr.rs
+17 -11
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@@ -2649,17 +2649,7 @@ fn check_expr_index(
// two-phase not needed because index_ty is never mutable
self.demand_coerce(idx, idx_t, index_ty, None, AllowTwoPhase::No);
self.select_obligations_where_possible(false, |errors| {
for error in errors {
match error.obligation.predicate.kind().skip_binder() {
ty::PredicateKind::Trait(predicate)
if self.tcx.is_diagnostic_item(
sym::SliceIndex,
predicate.trait_ref.def_id,
) => {}
_ => continue,
}
error.obligation.cause.span = idx.span;
}
self.point_at_index_if_possible(errors, idx.span)
});
element_ty
}
@@ -2704,6 +2694,22 @@ fn check_expr_index(
}
}
fn point_at_index_if_possible(
&self,
errors: &mut Vec<traits::FulfillmentError<'tcx>>,
span: Span,
) {
for error in errors {
match error.obligation.predicate.kind().skip_binder() {
ty::PredicateKind::Trait(predicate)
if self.tcx.is_diagnostic_item(sym::SliceIndex, predicate.trait_ref.def_id) => {
}
_ => continue,
}
error.obligation.cause.span = span;
}
}
fn check_expr_yield(
&self,
value: &'tcx hir::Expr<'tcx>,