syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:         match self.ctxt().outer_expn_data().kind {
context_before:     pub fn desugaring_kind(self) -> Option<DesugaringKind> {
context_after:             ExpnKind::Desugaring(k) => Some(k),