[GROOVY-10079] groovyc does not perform unboxing on Character type

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-beta-1, 3.0.9
• Component/s: Static Type Checker
• Assignee: Eric Milles
• Reporter: Thodoris Sotiropoulos
• Created: 10/May/21 10:07
• Updated: 03/Feb/22 22:34
• Resolved: 11/May/21 23:16

Description

I have the following code

public class Main {
  public static char foo() {
    return (Character) 'd';
  }
}

Actual behaviour

groovyc rejects this code with

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 4: [Static type checking] - Cannot return value of type java.lang.Character on method returning type char
 @ line 4, column 12.
       return (Character) 'd';
              ^1 error

Expected behaviour

Compile successfully

 

Note that javac accepts this code. Beyond that, groovyc performs unboxing as expected when encountering other wrapper classes, e.g. Short. So, for example the following code is accepted by groovyc.

 

public class Main {
  public static short foo() {
    return (Short) 1;
  }
}

Tested against master: https://github.com/apache/groovy/commit/1def25301b42132f0fce82f2f524aa09c53835d4