Add a test for rust-lang#46101

src/test/ui/issues/issue-46101.rs

@@ -0,0 +1,4 @@
+#![feature(use_extern_macros)]
+trait Foo {}
+#[derive(Foo::Anything)] //~ ERROR failed to resolve: partially resolved path in a derive macro
+struct S;

src/test/ui/issues/issue-46101.stderr

@@ -0,0 +1,14 @@
+error[E0433]: failed to resolve: partially resolved path in a derive macro
+  --> $DIR/issue-46101.rs:3:10
+   |
+LL | #[derive(Foo::Anything)] //~ ERROR failed to resolve: partially resolved path in a derive macro
+   |          ^^^^^^^^^^^^^ partially resolved path in a derive macro
+
+error[E0601]: `main` function not found in crate `issue_46101`
+   |
+   = note: consider adding a `main` function to `$DIR/issue-46101.rs`
+
+error: aborting due to 2 previous errors
+
+Some errors occurred: E0433, E0601.
+For more information about an error, try `rustc --explain E0433`.