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https://issues.apache.org/jira/browse/GROOVY-9635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles reassigned GROOVY-9635:
-----------------------------------
Assignee: Eric Milles
> Generic types get mixed up
> --------------------------
>
> Key: GROOVY-9635
> URL: https://issues.apache.org/jira/browse/GROOVY-9635
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation
> Affects Versions: 2.4.15, 3.0.4
> Reporter: Felix Scheinost
> Assignee: Eric Milles
> Priority: Major
>
> When having a generic function inside a generic class with a constraint the
> generic types somehow get mixed up.
> In the following example the variable v should have the type V. But the
> generated bytecode contains a cast to the constraint on the generic type of
> the class.
>
> {code:java}
> import groovy.transform.CompileStatic
> import java.util.function.Function
> @CompileStatic
> class Test<R extends Integer> {
> def <V> V method(Function<Test, V> f) {
> /**
> * org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot
> cast object '' with class 'java.lang.String' to class 'java.lang.Integer'
> * at Test.traverseFindResult(ConsoleScript4:7)
> * at Test$traverseFindResult.call(Unknown Source)
> * at ConsoleScript4.run(ConsoleScript4:12)
> */
> def v = f.apply(this) // V v = f.apply(this) doesn't work as well, but
> directly returning without assignment works
> return v
> }
> }
> new Test().method(new Function<Test, String>() {
> @Override
> String apply(Test test) {
> ""
> }
> })
> {code}
>
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