Fixes a handful of clippy warnings

[collinc97]

No description provided.

[codecov]

Codecov Report

Merging #2539 (16473f2) into testnet3 (a255113) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##           testnet3    #2539      +/-   ##
============================================
- Coverage     79.03%   79.01%   -0.02%     
============================================
  Files           159      159              
  Lines          5309     5309              
  Branches       5309     5309              
============================================
- Hits           4196     4195       -1     
- Misses         1113     1114       +1     

Files Changed	Coverage Δ
...ompiler/passes/src/flattening/flatten_statement.rs	62.96% <21.42%> (ø)
compiler/ast/src/functions/mod.rs	100.00% <100.00%> (ø)
...er/passes/src/code_generation/visit_expressions.rs	77.92% <100.00%> (ø)
...mpiler/passes/src/flattening/flatten_expression.rs	81.64% <100.00%> (+0.11%)	⬆️
.../passes/src/function_inlining/inline_expression.rs	94.73% <100.00%> (ø)
...r/passes/src/function_inlining/inline_statement.rs	63.15% <100.00%> (ø)
.../src/static_single_assignment/rename_expression.rs	94.49% <100.00%> (ø)
...iler/passes/src/type_checking/check_expressions.rs	82.35% <100.00%> (-0.06%)	⬇️

... and 1 file with indirect coverage changes

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[d0cd]

LGTM!