syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // [1]: https://bugs.llvm.org/show_bug.cgi?id=44316
context_before:     //   both for exports and imports through foreign items. This is handled above.
context_after:     if tcx.is_foreign_item(def_id)