only warn for anon functions

[JonasIsensee]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.17%. Comparing base (3647927) to head (5ed91ab).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
src/data/writing_datatypes.jl	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #597      +/-   ##
==========================================
- Coverage   85.19%   85.17%   -0.03%     
==========================================
  Files          36       36              
  Lines        4391     4391              
==========================================
- Hits         3741     3740       -1     
- Misses        650      651       +1     

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