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Check: Cyclic type parameter bounds #874

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lars-reimann opened this issue Feb 10, 2024 · 0 comments · Fixed by #886
Closed

Check: Cyclic type parameter bounds #874

lars-reimann opened this issue Feb 10, 2024 · 0 comments · Fixed by #886
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@lars-reimann
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enhancement 💡 New feature or request released Included in a release validation ✔️ Improved or new static checks
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v0.7.0

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@lars-reimann
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Is your feature request related to a problem?

Type parameters can be bounded by another type parameter. This can lead to cycles:

class C<T1, T2> where {
    T1 sub T2,
    T2 sub T1
}

Desired solution

Detect such cycles and show an error.

Possible alternatives (optional)

No response

Screenshots (optional)

No response

Additional Context (optional)

No response
@lars-reimann lars-reimann added enhancement 💡 New feature or request validation ✔️ Improved or new static checks labels Feb 10, 2024
@lars-reimann lars-reimann self-assigned this Feb 10, 2024
@lars-reimann lars-reimann added this to the v0.7.0 milestone Feb 10, 2024
@lars-reimann lars-reimann mentioned this issue Feb 12, 2024
Merged
@lars-reimann lars-reimann linked a pull request Feb 12, 2024 that will close this issue
feat: check whether type parameter bounds are acyclic #886
Merged
lars-reimann added a commit that referenced this issue Feb 12, 2024
@lars-reimann
feat: check whether type parameter bounds are acyclic (#886)
bcf1a4b 
Closes #874

### Summary of Changes

Add a check to ensure type parameter bounds are acyclic.
lars-reimann pushed a commit that referenced this issue Feb 12, 2024
@semantic-release-bot
chore(release): 0.7.0 [skip ci]
e4be7b1 
## [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))
@lars-reimann lars-reimann added the released Included in a release label Feb 12, 2024
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enhancement 💡 New feature or request released Included in a release validation ✔️ Improved or new static checks
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DSL
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v0.7.0
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feat: check whether type parameter bounds are acyclic Safe-DS/DSL
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