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https://issues.apache.org/jira/browse/GROOVY-10372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul King closed GROOVY-10372.
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> STC: check lambda or closure parameter types against target method
> ------------------------------------------------------------------
>
> Key: GROOVY-10372
> URL: https://issues.apache.org/jira/browse/GROOVY-10372
> Project: Groovy
> Issue Type: Improvement
> Components: Static Type Checker
> Reporter: Eric Milles
> Assignee: Eric Milles
> Priority: Major
> Fix For: 4.0.0-rc-1
>
>
> Follow up from GROOVY-10277. Consider the following:
> {code:groovy}
> @groovy.transform.TypeChecked
> void test() {
> Comparator<Integer> cmp = (int one, int two) -> Integer.compare(one,two)
> }
> {code}
> Instead of an error for mismatched generics -- which was the previous
> disposition of the compiler -- there could be an error for each typed
> parameter that does not match expectations. {{ecj}} produces the following
> error for the above's Java equivalent: "Lambda expression's parameter {{one}}
> is expected to be of type {{Integer}}"
> These checks should extend to lambdas or closures that are cast, coerced or
> passed as arguments.
> https://github.com/apache/groovy/blob/eb8854afcf02057f70b8a979a873e0a34393b740/src/test/groovy/transform/stc/LambdaTest.groovy#L243
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