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Check node kind to avoid ICE in check_expr_return()

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This commit is contained in:
Fabian Wolff 2021-06-29 22:11:48 +02:00
parent e98897e5dc
commit 2586e962e0
3 changed files with 33 additions and 12 deletions
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28
compiler/rustc_typeck/src/check/expr.rs
View file

@ -682,23 +682,27 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
};
let encl_item_id = self.tcx.hir().get_parent_item(expr.hir_id);
let encl_item = self.tcx.hir().expect_item(encl_item_id);
if let hir::ItemKind::Fn(..) = encl_item.kind {
// We are inside a function body, so reporting "return statement
// outside of function body" needs an explanation.
// Somewhat confusingly, get_parent_item() does not necessarily return an
// item -- it can also return a Foreign-/Impl-/TraitItem or a Crate (see
// issue #86721). If it does, we still report the same error.
if let Some(hir::Node::Item(encl_item)) = self.tcx.hir().find(encl_item_id) {
if let hir::ItemKind::Fn(..) = encl_item.kind {
// We are inside a function body, so reporting "return statement
// outside of function body" needs an explanation.
let encl_body_owner_id = self.tcx.hir().enclosing_body_owner(expr.hir_id);
let encl_body_owner_id = self.tcx.hir().enclosing_body_owner(expr.hir_id);
// If this didn't hold, we would not have to report an error in
// the first place.
assert_ne!(encl_item_id, encl_body_owner_id);
// If this didn't hold, we would not have to report an error in
// the first place.
assert_ne!(encl_item_id, encl_body_owner_id);
let encl_body_id = self.tcx.hir().body_owned_by(encl_body_owner_id);
let encl_body = self.tcx.hir().body(encl_body_id);
let encl_body_id = self.tcx.hir().body_owned_by(encl_body_owner_id);
let encl_body = self.tcx.hir().body(encl_body_id);
err.encl_body_span = Some(encl_body.value.span);
err.encl_fn_span = Some(encl_item.span);
err.encl_body_span = Some(encl_body.value.span);
err.encl_fn_span = Some(encl_item.span);
}
}
self.tcx.sess.emit_err(err);

8
src/test/ui/typeck/issue-86721-return-expr-ice.rs Normal file
View file

@ -0,0 +1,8 @@
// Regression test for the ICE described in #86721.
#![crate_type="lib"]
trait T {
const U: usize = return;
//~^ ERROR: return statement outside of function body [E0572]
}

9
src/test/ui/typeck/issue-86721-return-expr-ice.stderr Normal file
View file

@ -0,0 +1,9 @@
error[E0572]: return statement outside of function body
--> $DIR/issue-86721-return-expr-ice.rs:6:22
|
LL | const U: usize = return;
| ^^^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0572`.