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Do not ICE when suggesting dereferencing closure arg

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Account for `for` lifetimes when constructing closure to see if dereferencing the return value would be valid.

Fix #125634, fix #124563.
This commit is contained in:
Esteban Küber 2024-06-24 01:11:56 +00:00
parent 33422e72c8
commit a2298a6f19
8 changed files with 119 additions and 8 deletions
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6
compiler/rustc_borrowck/src/diagnostics/region_errors.rs
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@ -1152,7 +1152,9 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
// Get the arguments for the found method, only specifying that `Self` is the receiver type.
let Some(possible_rcvr_ty) = typeck_results.node_type_opt(rcvr.hir_id) else { return };
let args = GenericArgs::for_item(tcx, method_def_id, |param, _| {
if param.index == 0 {
if let ty::GenericParamDefKind::Lifetime = param.kind {
tcx.lifetimes.re_erased.into()
} else if param.index == 0 && param.name == kw::SelfUpper {
possible_rcvr_ty.into()
} else if param.index == closure_param.index {
closure_ty.into()
@ -1169,7 +1171,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
Obligation::misc(tcx, span, self.mir_def_id(), self.param_env, pred)
}));
if ocx.select_all_or_error().is_empty() {
if ocx.select_all_or_error().is_empty() && count > 0 {
diag.span_suggestion_verbose(
tcx.hir().body(*body).value.peel_blocks().span.shrink_to_lo(),
"dereference the return value",