syntax_data: {"ast_node_type":"variable","tokens":[{"end":60,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let cause_let = FakeReadCause::ForLet(None);
context_before:                 let pattern_source_info = self.source_info(irrefutable_pat.span);
context_after:                 self.cfg.push_fake_read(block, pattern_source_info, cause_let, place);