Better printing of non-identifier variables

[BenPH]

Fixes #314

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.97%. Comparing base (86a1170) to head (4e8e7d9).
⚠️ Report is 30 commits behind head on master.

Files with missing lines	Patch %	Lines
src/printing.jl	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #331      +/-   ##
==========================================
- Coverage   51.03%   50.97%   -0.07%     
==========================================
  Files           9        9              
  Lines         821      822       +1     
==========================================
  Hits          419      419              
- Misses        402      403       +1     

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