syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"\"\\n#{}:"}]}
source_snippet:                     "\n#{}: parent: {:?}, outer_mark: ({:?}, {:?})",
context_before:                 s.push_str(&format!(
context_after:                     id, ctxt.parent, ctxt.outer_expn, ctxt.outer_transparency,