syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"ExpnKind::Desugaring(k)"}]}
source_snippet:             ExpnKind::Desugaring(k) => k == kind,
context_before:         match self.ctxt().outer_expn_data().kind {
context_after:             _ => false,