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https://issues.apache.org/jira/browse/GROOVY-11275?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles closed GROOVY-11275.
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Resolution: Duplicate
> Support type witness in method reference
> ----------------------------------------
>
> Key: GROOVY-11275
> URL: https://issues.apache.org/jira/browse/GROOVY-11275
> Project: Groovy
> Issue Type: Improvement
> Components: Compiler, parser-antlr4
> Affects Versions: 4.0.17
> Reporter: Christopher Smith
> Priority: Major
>
> Java permits type witnesses as part of a method reference to provide the
> usual hinting:
> {code:java}
> Optional<List<Number>> foo = Optional.of(42).map(List::<Number>of);
> {code}
> The Groovy grammar as of 4.0.17 does not support type witnesses in this
> position, but there are a number of cases where the compiler (particularly
> the STC) has limitations with type inference and it would be helpful to have.
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