syntax_data: {"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":".map(|scrut_span|"}]}
source_snippet:                         .map(|scrut_span| scrut_span.shrink_to_hi().with_hi(expr_span.hi())),
context_before:                         .find_ancestor_in_same_ctxt(expr_span)
context_after:                     hir::MatchSource::Postfix => {