Ui tests with compile_error resolved at call site

test_suite/tests/ui/identifier/not_unit.stderr

@@ -1,6 +1,11 @@
 error: #[serde(other)] must be on a unit variant
  --> tests/ui/identifier/not_unit.rs:7:5
   |
+3 |   #[derive(Deserialize)]
+  |            ----------- in this derive macro expansion
+...
 7 | /     #[serde(other)]
 8 | |     Other(u8, u8),
   | |_________________^
+  |
+  = note: this error originates in the derive macro `Deserialize` (in Nightly builds, run with -Z macro-backtrace for more info)