Groovyc is unable to compile a class which implements interface and uses @Delegate annotation

Groovy source file is attached.

I am trying to compile this file with the command:
groovy Temp.groovy

Compiler's output is as follows:

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Temp.groovy: 4: Can't have an abstract method in a non-abstract class. The class 'Temp' must be declared abstract or the method 'void run()' must be implemented.
@ line 4, column 1.
class Temp implements Runnable {
^

1 error