syntax_data: {"ast_node_type":"variable","tokens":[{"end":48,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let outer_mark = self.outer_mark(*ctxt);
context_before:     fn remove_mark(&self, ctxt: &mut SyntaxContext) -> (ExpnId, Transparency) {
context_after:         *ctxt = self.parent_ctxt(*ctxt);