Rollup merge of #130033 - compiler-errors:foreign-fn-types, r=BoxyUwU

Don't call `fn_arg_names` query for non-`fn` foreign items in resolver

Fixes #130015

3 files changed, 28 insertions, 0 deletions

diff --git a/tests/ui/resolve/auxiliary/foreign-trait-with-assoc.rs b/tests/ui/resolve/auxiliary/foreign-trait-with-assoc.rs
new file mode 100644
index 00000000000..952957ec480
--- /dev/null
+++ b/tests/ui/resolve/auxiliary/foreign-trait-with-assoc.rs
@@ -0,0 +1,3 @@
+pub trait Foo {
+    type Bar;
+}
diff --git a/tests/ui/resolve/dont-compute-arg-names-for-non-fn.rs b/tests/ui/resolve/dont-compute-arg-names-for-non-fn.rs
new file mode 100644
index 00000000000..20bbbff8fd2
--- /dev/null
+++ b/tests/ui/resolve/dont-compute-arg-names-for-non-fn.rs
@@ -0,0 +1,11 @@
+//@ aux-build:foreign-trait-with-assoc.rs
+
+extern crate foreign_trait_with_assoc;
+use foreign_trait_with_assoc::Foo;
+
+// Make sure we don't try to call `fn_arg_names` on a non-fn item.
+
+impl Foo for Bar {}
+//~^ ERROR cannot find type `Bar` in this scope
+
+fn main() {}
diff --git a/tests/ui/resolve/dont-compute-arg-names-for-non-fn.stderr b/tests/ui/resolve/dont-compute-arg-names-for-non-fn.stderr
new file mode 100644
index 00000000000..a1a8bb575e1
--- /dev/null
+++ b/tests/ui/resolve/dont-compute-arg-names-for-non-fn.stderr
@@ -0,0 +1,14 @@
+error[E0412]: cannot find type `Bar` in this scope
+  --> $DIR/dont-compute-arg-names-for-non-fn.rs:8:14
+   |
+LL | impl Foo for Bar {}
+   |              ^^^
+   |
+help: you might have meant to use the associated type
+   |
+LL | impl Foo for Self::Bar {}
+   |              ++++++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0412`.