Rollup merge of rust-lang#90854 - sanxiyn:unsized-and-uninhabited, r=estebank

Type can be unsized and uninhabited

Fix rust-lang#88150.

Author: matthiaskrgr

compiler/rustc_middle/src/ty/layout.rs

@@ -533,7 +533,7 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
             }
         }
 
-        if sized && fields.iter().any(|f| f.abi.is_uninhabited()) {
+        if fields.iter().any(|f| f.abi.is_uninhabited()) {
             abi = Abi::Uninhabited;
         }
 

src/test/ui/issues/issue-88150.rs

@@ -0,0 +1,21 @@
+// run-pass
+// compile-flags:-C debuginfo=2
+// edition:2018
+
+use core::marker::PhantomData;
+
+pub struct Foo<T: ?Sized, A>(
+    PhantomData<(A, T)>,
+);
+
+enum Never {}
+
+impl<T: ?Sized> Foo<T, Never> {
+    fn new_foo() -> Foo<T, Never> {
+        Foo(PhantomData)
+    }
+}
+
+fn main() {
+    let _ = Foo::<[()], Never>::new_foo();
+}