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https://issues.apache.org/jira/browse/GROOVY-10858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-10858.
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> STC method reference return type checking
> -----------------------------------------
>
> Key: GROOVY-10858
> URL: https://issues.apache.org/jira/browse/GROOVY-10858
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Affects Versions: 3.0.13, 4.0.6
> Reporter: Eric Milles
> Assignee: Eric Milles
> Priority: Minor
> Fix For: 5.0.0-alpha-1
>
>
> Consider the following:
> {code:groovy}
> @groovy.transform.CompileStatic
> void test() {
> java.util.function.Function<Object,Number> f = Object::toString
> print(f.apply('xxx'))
> }
> {code}
> This code compiles and prints the string instead of a compile-time error
> indicating that String is not compatible with Number.
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