Incorrect type inference for Assign Return Value To New Variable

[nmatt]

Apache NetBeans version

Apache NetBeans 28

What happened

Assign Return Value To New Variable in some cases yields code that doesn't compile due to type errors. See the example below.

Language / Project Type / NetBeans Component

Java, Hints

How to reproduce

Example:

List<? extends CharSequence> list = Collections.emptyList();
list.stream().collect(Collectors.groupingBy(CharSequence::toString));

Performing "Assign Return Value To New Variable" on the collect() call results in:

Map<String, List<? extends CharSequence>> collect = list.stream().collect(Collectors.groupingBy(CharSequence::toString));

However, this is incorrect and doesn't compile.

A correct result would be:

Map<String, ? extends List<? extends CharSequence>> collect = list.stream().collect(Collectors.groupingBy(CharSequence::toString));

Maybe wildcard captures aren't considered correctly.

Did this work correctly in an earlier version?

No / Don't know

Operating System

Windows

JDK

NetBeans runs on JDK 21, the project is JDK 17

Apache NetBeans packaging

Apache NetBeans binary zip

Anything else

No response

Are you willing to submit a pull request?

No