Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.81%. Comparing base (8b18bb0) to head (e431706).

@@            Coverage Diff             @@
##           master     #330      +/-   ##
==========================================
+ Coverage   93.74%   93.81%   +0.07%     
==========================================
  Files          29       28       -1     
  Lines        4570     4126     -444     
==========================================
- Hits         4284     3871     -413     
+ Misses        286      255      -31     

IMHO you should modify the dub.json file and specify that frontend version must be >= 2.111

Something like:

{
    "toolchainRequirements": {
        "frontend": ">=2.111"
    }
}

This is why I do not like JSON for these things, as I would put a comment there // switched to use std.sumtype so whoever reads the dub.json file understands why we have that constraint...

We don't require 2.111. We just wait several versions to make breaking changes.

So you would rather see someone who uses an old (few months even) compiler and see bunch of errors instead of DUB saying "you are using incompatible frontent, required version >=2.111" or something similar?

The last compiler to fail compiling dyaml will be several years old by that point, and not even debian stable supports it now.