syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"self.place_into_pattern(block,"}]}
source_snippet:                 self.place_into_pattern(block, irrefutable_pat, place_builder, true)
context_before:                     unpack!(block = self.lower_scrutinee(block, initializer_id, initializer.span));
context_after:             }