feat: improvements to constraints #896
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Since type parameters can only refer to prior type parameters, we will eventually reach the start of the type parameter list and stop anyway.
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Additional details and impacted files@@ Coverage Diff @@
## main #896 +/- ##
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Coverage 100.00% 100.00%
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Files 93 92 -1
Lines 16792 16517 -275
Branches 3423 3350 -73
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## [0.8.0](v0.7.0...v0.8.0) (2024-02-26) ### Features * check the runner version to be compatible ([#888](#888)) ([83378a3](83378a3)), closes [#880](#880) * check type parameter bounds for default values and named types ([#919](#919)) ([7003ea6](7003ea6)), closes [#614](#614) * clamp default values of parameter types to upper bound ([#921](#921)) ([76ad869](76ad869)) * compute highest common subtype ([#901](#901)) ([5630a9f](5630a9f)), closes [#860](#860) * compute type parameters for calls ([#920](#920)) ([35dc826](35dc826)), closes [#861](#861) * consider nullability of upper type parameter bound in various checks ([#892](#892)) ([940515a](940515a)) * constraints for segments ([#911](#911)) ([e57f886](e57f886)), closes [#903](#903) * EDA on pipeline Tables ([#834](#834)) ([f42c9aa](f42c9aa)) * error if parent type is nullable ([#891](#891)) ([add650d](add650d)) * escape characters in string conversion of string constants ([#908](#908)) ([72a9c3c](72a9c3c)), closes [#904](#904) * format upper bound of type parameters ([#898](#898)) ([9d6ce28](9d6ce28)) * handle invariant/covariant type parameters when computing lowest common supertype ([#868](#868)) ([4d6cb4e](4d6cb4e)), closes [#860](#860) [#861](#861) * improve handling of subclasses of lists/maps ([#890](#890)) ([bb0c94b](bb0c94b)) * improvements to constraints ([#896](#896)) ([b81bef9](b81bef9)), closes [#18](#18) [#860](#860) [#18](#18) * include enum name in string conversion of enum variant types ([#907](#907)) ([1f6502e](1f6502e)), closes [#902](#902) * scoping for member accesses if receiver has type parameter type ([#889](#889)) ([1277bd1](1277bd1)) * shorter message if runner is started but files have errors ([#912](#912)) ([b611b44](b611b44)), closes [#910](#910) * simplify union types containing type parameter types disregarding entry order ([#894](#894)) ([cf6e77e](cf6e77e)) * singular type is its own lowest common supertype ([#893](#893)) ([79d611d](79d611d)) * substitute type parameter when type checking calls ([#923](#923)) ([2e09306](2e09306)), closes [#915](#915) * substitute type parameters when checking overridden members ([#922](#922)) ([0e657cf](0e657cf)), closes [#917](#917) * update to `safe-ds-runner` v0.7.0 ([#906](#906)) ([070f406](070f406)) * use bounds of type system where possible ([#899](#899)) ([cf92762](cf92762)) ### Bug Fixes * lenient type checking involving type parameter types ([#916](#916)) ([b9d3641](b9d3641)), closes [#915](#915) [#915](#915) * runner startup silent failure ([#914](#914)) ([8812944](8812944)), closes [#909](#909) * save dirty files before running pipeline ([#918](#918)) ([4302ca6](4302ca6)) * simplification of union types ([#897](#897)) ([4c577a3](4c577a3))
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🎉 This PR is included in version 0.8.0 🎉 The release is available on: Your semantic-release bot 📦🚀 |
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Closes partially #18
Summary of Changes
Nothingis no subtype of a type parameter type with a lower bound other thanNothing. This means, when computing the highest common subtype (Handle type parameters when computing lowest common supertype #860), we could only return$unknownfor a type parameter type with a lower bound of, say,Int, and another type likeNumber.