Error improvements

[samuelcolvin]

No description provided.

[codecov]

Codecov Report

Merging #138 (18ba518) into main (b95b3d2) will increase coverage by 0.01%.
The diff coverage is 99.25%.

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
+ Coverage   97.44%   97.45%   +0.01%     
==========================================
  Files          41       41              
  Lines        4068     4007      -61     
  Branches       28       28              
==========================================
- Hits         3964     3905      -59     
+ Misses        104      102       -2     

Impacted Files	Coverage Δ
src/build_tools.rs	98.43% <ø> (ø)
src/errors/mod.rs	92.30% <ø> (ø)
src/input/input_abstract.rs	100.00% <ø> (ø)
src/validators/nullable.rs	100.00% <ø> (ø)
src/validators/union.rs	98.41% <ø> (ø)
src/validators/function.rs	95.00% <93.75%> (+0.02%)	⬆️
src/errors/line_error.rs	95.08% <95.65%> (-2.04%)	⬇️
src/input/input_python.rs	98.20% <97.67%> (-0.02%)	⬇️
src/errors/kinds.rs	100.00% <100.00%> (ø)
src/errors/location.rs	100.00% <100.00%> (ø)
... and 23 more

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