[GROOVY-10961] STC rejects program when having SAM types and conditionals

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: Static Type Checker
• Assignee: Unassigned
• Reporter: Thodoris Sotiropoulos
• Created: 06/Mar/23 12:06
• Updated: 15/Apr/23 15:56

Description

I have the following program

import java.util.function.*;
import java.util.Deque;


class Main {
  static final void test(Deque<Integer> p1, Supplier<Integer> p2) {
    Supplier<Integer> x = (true) ? p1::peek : p2;
    
  }
}

Actual behavior

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 8: [Static type checking] - Cannot assign value of type java.lang.Object to variable of type java.util.function.Supplier<java.lang.Integer>
 @ line 8, column 27.
       Supplier<Integer> x = (true) ? p1::peek : p2;
                             ^

1 error

Expected behavior

Compile successfully

Tested against master (commit: ee93378e5c9560032284b66d33af440884c8505f)