syntax_data: {"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if let ty::Adt(adt_def, _) = lhs_expr.ty.kind() {
context_before:                     unpack!(block = this.expr_as_place(block, lhs, mutability, fake_borrow_temps,));
context_after:                     if adt_def.is_enum() {