syntax_data: {"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                     if mutbl.is_mut() && !arg_ty.is_unpin(self.tcx, self.typing_env) {
context_before:                     // `$place` to ensure it will not be used afterwards.
context_after:                         let block = self.thir.blocks.push(Block {