Add a test to confirm that #254 is fixed

[juntyr]

Fixes #254

* [ ] I've included my change in CHANGELOG.md

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.31% 🎉

Comparison is base (709486e) 84.88% compared to head (a6f0eeb) 85.19%.
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #478      +/-   ##
==========================================
+ Coverage   84.88%   85.19%   +0.31%     
==========================================
  Files          64       66       +2     
  Lines        8321     8513     +192     
==========================================
+ Hits         7063     7253     +190     
- Misses       1258     1260       +2     

Files Changed	Coverage Δ
tests/254_typetag.rs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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