feat: check whether lower and upper bounds of a type parameter are compatible #885
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lars-reimann
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## [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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Closes #875
Summary of Changes
Show an error if the lower bound of a type parameter is not assignable to its upper bound. In this case, there is no valid substitution for the type parameter.