{"ast_node_type":"other","tokens":[{"end":58,"kind":"keyword","start":0,"text":"//"}]}
                    // then suggest parens around the lhs.
                    // If the input is something like `if a { 1 } else { 2 } | if a { 3 } else { 4 }`
                    if let Some(sp) = this.psess.ambiguous_block_expr_parse.borrow().get(&lo) {