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Reject closures in patterns

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This commit is contained in:
Tomasz Miąsko
2021-10-18 00:00:00 +00:00
parent 1af55d19c7
commit c97cf7fed7
5 changed files with 44 additions and 1 deletions
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6
compiler/rustc_trait_selection/src/traits/structural_match.rs
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@@ -17,6 +17,7 @@ pub enum NonStructuralMatchTy<'tcx> {
Dynamic,
Foreign,
Opaque,
Closure,
Generator,
Projection,
}
@@ -154,6 +155,9 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for Search<'a, 'tcx> {
ty::Projection(..) => {
return ControlFlow::Break(NonStructuralMatchTy::Projection);
}
ty::Closure(..) => {
return ControlFlow::Break(NonStructuralMatchTy::Closure);
}
ty::Generator(..) | ty::GeneratorWitness(..) => {
return ControlFlow::Break(NonStructuralMatchTy::Generator);
}
@@ -197,7 +201,7 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for Search<'a, 'tcx> {
// First check all contained types and then tell the caller to continue searching.
return ty.super_visit_with(self);
}
ty::Closure(..) | ty::Infer(_) | ty::Placeholder(_) | ty::Bound(..) => {
ty::Infer(_) | ty::Placeholder(_) | ty::Bound(..) => {
bug!("unexpected type during structural-match checking: {:?}", ty);
}
ty::Error(_) => {