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

["Lyuben Atanasov (Jira)" <ji...@apache.org>]

Lyuben Atanasov created GROOVY-10053:
----------------------------------------

             Summary: 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


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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