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https://issues.apache.org/jira/browse/GROOVY-10226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles resolved GROOVY-10226.
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Resolution: Fixed
> LUB is computed incorrectly when involving bounded type variables
> -----------------------------------------------------------------
>
> Key: GROOVY-10226
> URL: https://issues.apache.org/jira/browse/GROOVY-10226
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Thodoris Sotiropoulos
> Assignee: Eric Milles
> Priority: Major
>
> I have the following program
>
> {code:java}
> class Foo<T> {}class Main {
> static final <T extends Foo<String>> T test() {
> final T x = null;
> true ? (T) null: x
> }
> }
> {code}
> h3. Actual behaviour
> groovyc rejects the above program and produces
>
> {code:java}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
> failed:
> test.groovy: 6: [Static type checking] - Cannot return value of type
> Foo<java.lang.Object> on method returning type T
> @ line 6, column 5.
> true ? (T) null: x
> ^1 error
> {code}
> h3. Expected behaviour
> Compile successfully
>
> Note that if I replace the bound of type parameter `T` with a
> non-parameterized bound (e.g., Number), groovyc compiles the program as
> expected.
>
> Tested against master
>
>
>
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