syntax_data: {"ast_node_type":"variable","tokens":[{"end":35,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let place_builder =
context_before:                 let initializer = &self.thir[initializer_id];
context_after:                     unpack!(block = self.lower_scrutinee(block, initializer_id, initializer.span));