syntax_data: {"ast_node_type":"variable","tokens":[{"end":35,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let place_builder =
context_before:             ExprKind::Deref { arg } => {
context_after:                     unpack!(block = this.expr_as_place(block, arg, mutability, fake_borrow_temps,));