{"ast_node_type":"import","tokens":[{"end":95,"kind":"keyword","start":0,"text":"//"}]}
            // Compute this as `0 - arg` so we can use `SubWithOverflow` to check for overflow.
        if op == UnOp::Neg && arg.layout.ty.is_integral() {
            let (arg, overflow) = self.use_ecx(|this| {