[jira] [Resolved] (GROOVY-10053) STC: Wrong type inferred for lambda parameter in a generic method

["Eric Milles (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/GROOVY-10053?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Milles resolved GROOVY-10053.
----------------------------------
    Fix Version/s: 4.0.0-beta-1
       Resolution: Fixed

> STC: Wrong type inferred for lambda parameter in a generic method
> -----------------------------------------------------------------
>
>                 Key: GROOVY-10053
>                 URL: https://issues.apache.org/jira/browse/GROOVY-10053
>             Project: Groovy
>          Issue Type: Bug
>          Components: Static Type Checker
>         Environment: OpenJDK8
>            Reporter: Lyuben Atanasov
>            Assignee: Eric Milles
>            Priority: Major
>             Fix For: 4.0.0-beta-1
>
>
> Following the fix of GROOVY-10049, a new issue has appeared. Consider the following code example:
> {code}
> class Test {
> 	Set<Number> getNumbers() {
> 		// mock return value, needed to demonstrate the issue
> 		return Collections.emptySet();
> 	}
> 	
> 	<T extends Number> Set<T> filterNumbers(Class<T> numberType) {
> 		Set<T> filteredNumbers = new HashSet<>();
> 		getNumbers().stream()
> 			.filter(numberType::isInstance)
> 			.map(numberType::cast)
> 			.forEach(num -> {
> 				filteredNumbers.add(num);
> 			});
> 		return filteredNumbers;
> 	}
> }
> def test = new Test()'
> test.filterNumbers(Integer);
> {code}
> Compiling with static type checking enabled produces an error:
> {noformat}
> Script_de4295e2a5171ce6c5ecd73605504d73.groovy: 14: [Static type checking] - Cannot call java.util.Set#add(T) with arguments [R] 
>  @ line 14, column 5.
>    				filteredNumbers.add(num);
> {noformat}
> This used to work fine before applying the fix for GROOVY-10049. Tested against https://github.com/apache/groovy/commit/e07f0112c5eff8d9c6828bd0ddb69e4b7f7cc1d6



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