support binary expressions for pointers (#416)

[99NIMI]

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[codecov-commenter]

Codecov Report

Merging #422 (2d72ee6) into master (5729541) will increase coverage by 0.07%.
The diff coverage is 99.16%.

@@            Coverage Diff             @@
##           master     #422      +/-   ##
==========================================
+ Coverage   93.12%   93.19%   +0.07%     
==========================================
  Files          31       31              
  Lines       11292    11411     +119     
==========================================
+ Hits        10516    10635     +119     
  Misses        776      776              

Impacted Files	Coverage Δ
src/codegen/generators/expression_generator.rs	88.05% <99.13%> (+0.99%)	⬆️
src/ast.rs	92.95% <100.00%> (+1.03%)	⬆️
src/typesystem.rs	94.88% <100.00%> (-0.17%)	⬇️
src/validation/stmt_validator.rs	98.32% <100.00%> (ø)
src/index.rs	97.22% <0.00%> (-0.75%)	⬇️
src/validation.rs	89.65% <0.00%> (-0.50%)	⬇️

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