syntax_data: {"ast_node_type":"variable","tokens":[{"end":44,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let place_builder = unpack!(
context_before:             ExprKind::PlaceUnwrapUnsafeBinder { source } => {
context_after:                     block = this.expr_as_place(block, source, mutability, fake_borrow_temps,)