syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // superseded by a more general implementation of deref patterns.
context_before:                 // FIXME(deref_patterns): This hack won't be necessary once `string_deref_patterns` is
context_after:                 let ct_ty = match pat_ty {