[GROOVY-9813] Support matching functional interface to variadic method reference

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.4
• Labels: varargs
• Assignee: Eric Milles
• Reporter: Eric Milles
• Created: 12/Nov/20 21:28
• Updated: 23/Jul/22 21:05
• Resolved: 09/Jun/22 16:51

Description

Java supports each of the following functional interface assignments for a variadic method like java.util.Arrays#asList.

import java.util.function.*
@groovy.transform.CompileStatic
void test() {
    Supplier<List> zero = Arrays::asList
    Function<Integer, List> one = Arrays::asList
    BiFunction<Integer, Integer, List> two = Arrays::asList
}

Note: Groovy compiler only produces error for first incompatible method reference.

Issue Links

• relates to: GROOVY-10653 SC: support extension or variadic method reference with instance expression