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https://issues.apache.org/jira/browse/GROOVY-9132?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-9132.
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> Improve type inference for method reference
> -------------------------------------------
>
> Key: GROOVY-9132
> URL: https://issues.apache.org/jira/browse/GROOVY-9132
> Project: Groovy
> Issue Type: Improvement
> Components: Static Type Checker
> Reporter: Paul King
> Assignee: Eric Milles
> Priority: Major
> Fix For: 4.0.0-alpha-2, 3.0.8
>
>
> Compiling this code:
> {code}
> assert 'Hi'.transform(String::length) * 3 == 6 // transform is JDK12
> {code}
> with type checking gives:
> {noformat}
> [Static type checking] - Cannot find matching method
> java.lang.Object#multiply(int). Please check if the declared type is correct
> and if the method exists.
> {noformat}
> We can close as duplicate if this overlaps with an existing issue. It might
> not be anything to do with method references but an existing limitation in
> the type checker around supporting generics involving bounded parameters. For
> reference, the definition of {{transform}} is:
> {code}
> public <R> R transform​(Function<? super String,​? extends R> f)
> {code}
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