1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/ui/proc-macro/disappearing-resolution.rs b/src/test/ui/proc-macro/disappearing-resolution.rs
new file mode 100644
index 000000000..50f04b1ea
--- /dev/null
+++ b/src/test/ui/proc-macro/disappearing-resolution.rs
@@ -0,0 +1,22 @@
+// Regression test for issue #64803 (initial attribute resolution can disappear later).
+
+// aux-build:test-macros.rs
+
+#[macro_use]
+extern crate test_macros;
+
+mod m {
+    use test_macros::Empty;
+}
+use m::Empty; //~ ERROR derive macro import `Empty` is private
+
+// To resolve `empty_helper` we need to resolve `Empty`.
+// During initial resolution `use m::Empty` introduces no entries, so we proceed to `macro_use`,
+// successfully resolve `Empty` from there, and then resolve `empty_helper` as its helper.
+// During validation `use m::Empty` introduces a `Res::Err` stub, so `Empty` resolves to it,
+// and `empty_helper` can no longer be resolved.
+#[empty_helper] //~ ERROR cannot find attribute `empty_helper` in this scope
+#[derive(Empty)]
+struct S;
+
+fn main() {}