Remove map iteration from list comprehension

[raviqqe]

Close #1722.

[codecov]

Codecov Report

Base: 88.05% // Head: 87.94% // Decreases project coverage by -0.11% ⚠️

Coverage data is based on head (8947c84) compared to base (fa7b4f3).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1726      +/-   ##
==========================================
- Coverage   88.05%   87.94%   -0.12%     
==========================================
  Files         467      467              
  Lines       55653    54614    -1039     
==========================================
- Hits        49005    48029     -976     
+ Misses       6648     6585      -63     

Impacted Files	Coverage Δ
lib/format/src/lib.rs	99.44% <ø> (-0.01%)	⬇️
lib/hir-mir/src/error.rs	12.90% <ø> (+3.60%)	⬆️
lib/hir-mir/src/lib.rs	98.61% <ø> (-0.12%)	⬇️
lib/hir/src/analysis/error.rs	0.53% <ø> (+<0.01%)	⬆️
lib/parse/src/parser.rs	99.90% <ø> (-0.01%)	⬇️
lib/hir-mir/src/list_comprehension.rs	100.00% <100.00%> (+8.15%)	⬆️
lib/hir-mir/src/variant_type_collection.rs	100.00% <100.00%> (+0.52%)	⬆️
lib/hir/src/analysis/type_checker.rs	99.27% <100.00%> (+0.25%)	⬆️
lib/hir/src/analysis/type_coercer.rs	96.14% <100.00%> (-0.34%)	⬇️
lib/hir/src/analysis/type_inferrer.rs	97.04% <100.00%> (-0.01%)	⬇️
... and 5 more

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