Add missing file location info from PR #625

Author: ratmice

lrpar/src/lib/ctbuilder.rs

@@ -1543,6 +1543,8 @@ where
                             let inner_span =
                                 Span::new(span.start() + last + off + "$".len(), span.end());
                             let mut s = String::from("\n");
+                            s.push_str(&diag.file_location_msg("Error", Some(inner_span)));
+                            s.push_str("\n");
                             s.push_str(&diag.underline_span_with_text(
                                 inner_span,
                                 "Unknown text following '$'".to_string(),