issue example 1

[chenxiang2019]

Title: WTF the bug is?

Content:

I find a error:

heavy_hitter.p4(127): warning: -1: negative value with unsigned type
    add_to_field(ipv4.ttl, -1);
                            ^
heavy_hitter.p4(152): warning: csum16: unexpected algorithm
    algorithm : csum16;
                ^^^^^^
error: HashAlgorithm.csum16: Invalid enum tag
heavy_hitter.p4(177): error: hash: Cannot unify Type(HashAlgorithm) to HashAlgorithm
    modify_field_with_hash_based_offset(custom_metadata.hash_val1, 0,
    ^
/usr/local/share/p4c/p4include/v1model.p4(115)
enum HashAlgorithm {
^^^^

How to resolve this?

[chenxiang2019]

Mark this issue as invalid.