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feat: check position of usages of variant type parameters #852

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merged 2 commits into from
Feb 2, 2024

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@lars-reimann lars-reimann commented Feb 2, 2024

Closes #743

Summary of Changes

  • Covariant type parameters must only be used in covariant positions.
  • Contravariant type parameters must only be used in contravariant positions.

This PR adds checks for this.

@lars-reimann lars-reimann linked an issue Feb 2, 2024 that may be closed by this pull request
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All modified and coverable lines are covered by tests ✅

Comparison is base (3362b6c) 100.00% compared to head (23d309a) 100.00%.

Additional details and impacted files
@@            Coverage Diff             @@
##              main      #852    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           89        89            
  Lines        14259     14368   +109     
  Branches      3019      3044    +25     
==========================================
+ Hits         14259     14368   +109     

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@lars-reimann lars-reimann merged commit a2672d7 into main Feb 2, 2024
7 of 8 checks passed
@lars-reimann lars-reimann deleted the 743-validation-error-type-parameter-variance branch February 2, 2024 16:39
lars-reimann pushed a commit that referenced this pull request Feb 12, 2024
## [0.7.0](v0.6.0...v0.7.0) (2024-02-12)

### Features

* apply type parameter substitutions of receiver type for member accesses ([#859](#859)) ([5780ed7](5780ed7)), closes [#23](#23)
* check position of usages of variant type parameters ([#852](#852)) ([a2672d7](a2672d7)), closes [#743](#743)
* check whether lower and upper bounds of a type parameter are compatible ([#885](#885)) ([2fc7fe6](2fc7fe6)), closes [#875](#875)
* check whether type parameter bounds are acyclic ([#886](#886)) ([bcf1a4b](bcf1a4b)), closes [#874](#874)
* check whether type parameter bounds are named types ([#878](#878)) ([d8b4168](d8b4168)), closes [#876](#876)
* error if type parameter has multiple lower/upper bounds ([#870](#870)) ([6035b76](6035b76)), closes [#867](#867)
* error if type parameter of class is used in static context ([#830](#830)) ([d5cf420](d5cf420)), closes [#809](#809)
* error if type parameters of functions are variant ([#869](#869)) ([9bf5fec](9bf5fec))
* handle type parameter types in type checker ([#884](#884)) ([6b6f738](6b6f738)), closes [#877](#877)
* handle type parameters (part 1) ([#856](#856)) ([8a35558](8a35558)), closes [#23](#23)
* improve type simplification ([#871](#871)) ([0daafb9](0daafb9))
* Memoization ([#827](#827)) ([d0a6c71](d0a6c71))
* null-safe call & indexed access ([#872](#872)) ([f1420a2](f1420a2)), closes [#857](#857) [#858](#858)
* optional type parameters ([#829](#829)) ([0e9f67a](0e9f67a)), closes [#739](#739)
* optionally generate code without runner integration ([#836](#836)) ([0ed9d6e](0ed9d6e)), closes [#831](#831)
* pre-load all relevant workspace files before executing pipeline ([#822](#822)) ([67ab766](67ab766))
* simplify computed types ([#866](#866)) ([bde3274](bde3274))
* simplify substitutions passed to `computeType` ([#873](#873)) ([aa444d4](aa444d4))
* substitute type parameters when checking assignability of overriding members ([#865](#865)) ([a1f24e0](a1f24e0)), closes [#862](#862)
* substitute type parameters when computing type of inherited members ([#864](#864)) ([33de1e8](33de1e8)), closes [#863](#863)
* support placeholder queries that only request a subset of data ([#826](#826)) ([1e39300](1e39300))
* type casts ([#838](#838)) ([66c3666](66c3666)), closes [#835](#835)

### Bug Fixes

* allow usage of covariant type parameters in own constructor ([#854](#854)) ([4ebae94](4ebae94))
* check for duplicate bounds if type parameters occur as right operand ([#882](#882)) ([8776ce0](8776ce0)), closes [#881](#881)
* generation of static class functions ([#832](#832)) ([57eac45](57eac45))
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Validation error: Type parameter variance
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