syntax_data: {"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                         let block = self.thir.blocks.push(Block {
context_before:                     if mutbl.is_mut() && !arg_ty.is_unpin(self.tcx, self.typing_env) {
context_after:                             targeted_by_break: false,