parsedigit_int

    pub fn parsedigit_int(p: *Parser) Error!bool {
        const def_index = @backingInt(Def.defdigit_int);
        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.parsedigit()) break :blk_0 true;
            p.i = pos_0;
            if ((p.i < p.source.len and switch (p.source[p.i]) {
                'e'...'e',
                'E'...'E',
                'p'...'p',
                'P'...'P',
                => blk_1: {
                    p.i += 1;
                    break :blk_1 true;
                },
                else => false,
            })) break :blk_0 true;
            p.i = pos_0;
            break :blk_0 false;
        };
    }