Test that none of the macros are reparsed

Author: jonas-schievink

crates/hir_def/src/nameres/tests/incremental.rs

@@ -137,6 +137,9 @@ m!(Z);
         });
         let n_recalculated_item_trees = events.iter().filter(|it| it.contains("item_tree")).count();
         assert_eq!(n_recalculated_item_trees, 6);
+        let n_reparsed_macros =
+            events.iter().filter(|it| it.contains("parse_macro_expansion")).count();
+        assert_eq!(n_reparsed_macros, 3);
     }
 
     let new_text = r#"
@@ -155,5 +158,8 @@ m!(Z);
         });
         let n_recalculated_item_trees = events.iter().filter(|it| it.contains("item_tree")).count();
         assert_eq!(n_recalculated_item_trees, 1);
+        let n_reparsed_macros =
+            events.iter().filter(|it| it.contains("parse_macro_expansion")).count();
+        assert_eq!(n_reparsed_macros, 0);
     }
 }