diff --git a/compiler/rustc_hir_typeck/src/closure.rs b/compiler/rustc_hir_typeck/src/closure.rs index d4d62a40328..e506c150f7d 100644 --- a/compiler/rustc_hir_typeck/src/closure.rs +++ b/compiler/rustc_hir_typeck/src/closure.rs @@ -56,7 +56,9 @@ pub fn check_expr_closure( // closure sooner rather than later, so first examine the expected // type, and see if can glean a closure kind from there. let (expected_sig, expected_kind) = match expected.to_option(self) { - Some(ty) => self.deduce_closure_signature(ty), + Some(ty) => { + self.deduce_closure_signature(self.try_structurally_resolve_type(expr_span, ty)) + } None => (None, None), }; let body = self.tcx.hir().body(closure.body); diff --git a/tests/ui/traits/new-solver/deduce-closure-signature-after-normalization.rs b/tests/ui/traits/new-solver/deduce-closure-signature-after-normalization.rs new file mode 100644 index 00000000000..d67fc65032c --- /dev/null +++ b/tests/ui/traits/new-solver/deduce-closure-signature-after-normalization.rs @@ -0,0 +1,12 @@ +// compile-flags: -Ztrait-solver=next +// check-pass + +#![feature(return_position_impl_trait_in_trait)] + +trait Foo { + fn test() -> impl Fn(u32) -> u32 { + |x| x.count_ones() + } +} + +fn main() {}