only query `params_in_repr` if def kind is adt

5 files changed, 45 insertions, 6 deletions

diff --git a/compiler/rustc_middle/src/values.rs b/compiler/rustc_middle/src/values.rs
index c98d88e22d4..48ca38344cf 100644
--- a/compiler/rustc_middle/src/values.rs
+++ b/compiler/rustc_middle/src/values.rs
@@ -358,7 +358,7 @@ fn find_item_ty_spans(
     match ty.kind {
         hir::TyKind::Path(hir::QPath::Resolved(_, path)) => {
             if let Res::Def(kind, def_id) = path.res
-                && !matches!(kind, DefKind::TyAlias)
+                && matches!(kind, DefKind::Enum | DefKind::Struct | DefKind::Union)
             {
                 let check_params = def_id.as_local().map_or(true, |def_id| {
                     if def_id == needle {
diff --git a/tests/crashes/128327.rs b/tests/crashes/128327.rs
deleted file mode 100644
index a63f758c317..00000000000
--- a/tests/crashes/128327.rs
+++ /dev/null
@@ -1,5 +0,0 @@
-//@ known-bug: rust-lang/rust#128327
-
-use std::ops::Deref;
-struct Apple((Apple, <&'static [f64] as Deref>::Target(Banana ? Citron)));
-fn main(){}
diff --git a/tests/ui/infinite/auxiliary/alias.rs b/tests/ui/infinite/auxiliary/alias.rs
index 59add7eb18b..5ae124e8aba 100644
--- a/tests/ui/infinite/auxiliary/alias.rs
+++ b/tests/ui/infinite/auxiliary/alias.rs
@@ -1,2 +1,5 @@
 pub struct W<T>(T);
 pub type Wrapper<T> = W<T>;
+pub trait Trait {
+    type T;
+}
diff --git a/tests/ui/infinite/infinite-assoc.rs b/tests/ui/infinite/infinite-assoc.rs
new file mode 100644
index 00000000000..d128a7e0d2d
--- /dev/null
+++ b/tests/ui/infinite/infinite-assoc.rs
@@ -0,0 +1,16 @@
+//@ aux-build: alias.rs
+
+// issue#128327
+
+extern crate alias;
+
+use alias::Trait;
+struct S;
+impl Trait for S {
+    type T = ();
+}
+struct A((A, <S as Trait>::T<NOT_EXIST?>));
+//~^ ERROR: invalid `?` in type
+//~| ERROR: recursive type `A` has infinite size
+
+fn main() {}
diff --git a/tests/ui/infinite/infinite-assoc.stderr b/tests/ui/infinite/infinite-assoc.stderr
new file mode 100644
index 00000000000..e6b91f13241
--- /dev/null
+++ b/tests/ui/infinite/infinite-assoc.stderr
@@ -0,0 +1,25 @@
+error: invalid `?` in type
+  --> $DIR/infinite-assoc.rs:12:39
+   |
+LL | struct A((A, <S as Trait>::T<NOT_EXIST?>));
+   |                                       ^ `?` is only allowed on expressions, not types
+   |
+help: if you meant to express that the type might not contain a value, use the `Option` wrapper type
+   |
+LL | struct A((A, <S as Trait>::T<Option<NOT_EXIST>>));
+   |                              +++++++         ~
+
+error[E0072]: recursive type `A` has infinite size
+  --> $DIR/infinite-assoc.rs:12:1
+   |
+LL | struct A((A, <S as Trait>::T<NOT_EXIST?>));
+   | ^^^^^^^^  - recursive without indirection
+   |
+help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
+   |
+LL | struct A((Box<A>, <S as Trait>::T<NOT_EXIST?>));
+   |           ++++ +
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0072`.