Fix source positions in error messsages

[raviqqe]

Close #1728.

Todo

• Remove the Type::set_position() function.

[codecov]

Codecov Report

Base: 87.94% // Head: 87.91% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (0a77320) compared to base (8f98505).
Patch coverage: 80.90% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1729      +/-   ##
==========================================
- Coverage   87.94%   87.91%   -0.03%     
==========================================
  Files         467      467              
  Lines       54614    55056     +442     
==========================================
+ Hits        48029    48404     +375     
- Misses       6585     6652      +67     

Impacted Files	Coverage Δ
lib/hir-mir/src/module.rs	94.19% <0.00%> (-1.28%)	⬇️
lib/hir/src/analysis/error.rs	0.54% <0.00%> (+0.01%)	⬆️
lib/hir/src/analysis/record_field_validator.rs	96.11% <25.00%> (-3.03%)	⬇️
lib/hir-mir/src/built_in_call.rs	93.67% <40.00%> (-3.57%)	⬇️
lib/hir/src/analysis/type_inferrer.rs	96.29% <55.31%> (-0.75%)	⬇️
lib/hir/src/analysis/type_coercer.rs	95.74% <55.55%> (-0.41%)	⬇️
lib/hir-mir/src/expression.rs	93.14% <70.58%> (-0.45%)	⬇️
lib/hir/src/analysis/type_extractor.rs	95.63% <82.60%> (-0.84%)	⬇️
lib/hir/src/analysis/type_checker.rs	98.49% <93.18%> (-0.79%)	⬇️
lib/hir-mir/src/downcast.rs	100.00% <100.00%> (ø)
... and 11 more

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