parseBitShiftExpr

    pub fn parseBitShiftExpr(p: *Parser) Error!bool {
        const def_index = @backingInt(Def.defBitShiftExpr);
        if (p.depths[def_index] > max_depth) return error.MaxDepth;
        p.depths[def_index] += 1;
        defer p.depths[def_index] -= 1;
        return blk_0: {
            const pos_0 = p.i;
            if (try p.parseAdditionExpr() and blk_1: {
                var i_1: usize = 0;
                while (blk_3: {
                    const pos_3 = p.i;
                    if (try p.parseBitShiftOp() and try p.parseAdditionExpr()) break :blk_3 true;
                    p.i = pos_3;
                    break :blk_3 false;
                }) {
                    if (i_1 > max_depth) return error.MaxDepth;
                    i_1 += 1;
                }
                break :blk_1 true;
            } and blk_1: {
                const pos_1 = p.i;
                const match_1 = try p.parseBitShiftOp();
                p.i = pos_1;
                break :blk_1 !match_1;
            }) break :blk_0 true;
            p.i = pos_0;
            break :blk_0 false;
        };
    }