save-analysis: Don't panic for macro-generated use globs

Follow-up to c2bb7ca.

Author: Xanewok

src/librustc_save_analysis/dump_visitor.rs

@@ -1256,21 +1256,25 @@ impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> DumpVisitor<'l, 'tcx, 'll, O> {
  Vec::new()
  };
 
- let sub_span =
- self.span.sub_span_of_token(use_tree.span, token::BinOp(token::Star));
- if !self.span.filter_generated(use_tree.span) {
- let span =
- self.span_from_span(sub_span.expect("No span found for use glob"));
- self.dumper.import(&access, Import {
- kind: ImportKind::GlobUse,
- ref_id: None,
- span,
- alias_span: None,
- name: "*".to_owned(),
- value: names.join(", "),
- parent,
- });
- self.write_sub_paths(&path);
+ // Otherwise it's a span with wrong macro expansion info, which
+ // we don't want to track anyway, since it's probably macro-internal `use`
+ if let Some(sub_span) =
+ self.span.sub_span_of_token(use_tree.span, token::BinOp(token::Star))
+ {
+ if !self.span.filter_generated(use_tree.span) {
+ let span = self.span_from_span(sub_span);
+
+ self.dumper.import(&access, Import {
+ kind: ImportKind::GlobUse,
+ ref_id: None,
+ span,
+ alias_span: None,
+ name: "*".to_owned(),
+ value: names.join(", "),
+ parent,
+ });
+ self.write_sub_paths(&path);
+ }
  }
  }
  ast::UseTreeKind::Nested(ref nested_items) => {