Rollup merge of #61118 - pnkfelix:issue-60654-dont-ice-on-gat, r=varkor
Dont ICE on an attempt to use GAT without feature gate Fix #60654
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57139e2055
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@ -658,12 +658,15 @@ impl<'tcx> ScopeTree {
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// The lifetime was defined on node that doesn't own a body,
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// which in practice can only mean a trait or an impl, that
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// is the parent of a method, and that is enforced below.
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assert_eq!(Some(param_owner_id), self.root_parent,
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"free_scope: {:?} not recognized by the \
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region scope tree for {:?} / {:?}",
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param_owner,
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self.root_parent.map(|id| tcx.hir().local_def_id_from_hir_id(id)),
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self.root_body.map(|hir_id| DefId::local(hir_id.owner)));
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if Some(param_owner_id) != self.root_parent {
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tcx.sess.delay_span_bug(
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DUMMY_SP,
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&format!("free_scope: {:?} not recognized by the \
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region scope tree for {:?} / {:?}",
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param_owner,
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self.root_parent.map(|id| tcx.hir().local_def_id_from_hir_id(id)),
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self.root_body.map(|hir_id| DefId::local(hir_id.owner))));
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}
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// The trait/impl lifetime is in scope for the method's body.
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self.root_body.unwrap().local_id
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@ -479,21 +479,22 @@ impl<'a, 'gcx, 'tcx> TypeFolder<'gcx, 'tcx> for SubstFolder<'a, 'gcx, 'tcx> {
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// the specialized routine `ty::replace_late_regions()`.
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match *r {
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ty::ReEarlyBound(data) => {
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let r = self.substs.get(data.index as usize).map(|k| k.unpack());
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match r {
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let rk = self.substs.get(data.index as usize).map(|k| k.unpack());
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match rk {
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Some(UnpackedKind::Lifetime(lt)) => {
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self.shift_region_through_binders(lt)
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}
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_ => {
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let span = self.span.unwrap_or(DUMMY_SP);
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span_bug!(
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span,
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let msg = format!(
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"Region parameter out of range \
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when substituting in region {} (root type={:?}) \
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(index={})",
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data.name,
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self.root_ty,
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data.index);
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self.tcx.sess.delay_span_bug(span, &msg);
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r
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}
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}
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}
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@ -0,0 +1,14 @@
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// rust-lang/rust#60654: Do not ICE on an attempt to use GATs that is
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// missing the feature gate.
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struct Foo;
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impl Iterator for Foo {
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type Item<'b> = &'b Foo; //~ ERROR generic associated types are unstable [E0658]
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fn next(&mut self) -> Option<Self::Item> {
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None
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}
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}
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fn main() { }
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@ -0,0 +1,12 @@
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error[E0658]: generic associated types are unstable
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--> $DIR/gat-dont-ice-on-absent-feature.rs:7:5
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LL | type Item<'b> = &'b Foo;
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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= note: for more information, see https://github.com/rust-lang/rust/issues/44265
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= help: add #![feature(generic_associated_types)] to the crate attributes to enable
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0658`.
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