hygiene: Do not treat Self ctor as a local variable

src/test/ui/resolve/issue-57523.rs

@@ -0,0 +1,21 @@
+// compile-pass
+
+struct S(u8);
+
+impl S {
+    fn method1() -> Self {
+        Self(0)
+    }
+}
+
+macro_rules! define_method { () => {
+    impl S {
+        fn method2() -> Self {
+            Self(0) // OK
+        }
+    }
+}}
+
+define_method!();
+
+fn main() {}