Bug in Exists(func)

[araddon]

see #234

[codecov-io]

Codecov Report

Merging #235 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #235      +/-   ##
==========================================
- Coverage   67.56%   67.55%   -0.01%     
==========================================
  Files          87       87              
  Lines       17027    17028       +1     
==========================================
  Hits        11504    11504              
- Misses       4599     4600       +1     
  Partials      924      924

Impacted Files	Coverage Δ
expr/parse.go	64.49% <ø> (ø)	⬆️
lex/lexer.go	69.15% <0%> (-0.04%)	⬇️

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