[GROOVY-7512] Cannot call Trait method from Closure when using static compilation

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.4
• Fix Version/s: 4.0.0-alpha-1, 3.0.5, 2.5.16
• Component/s: Compiler, Static compilation, Static Type Checker
• Labels: traits
• Assignee: Eric Milles
• Reporter: César Izurieta
• Created: 20/Jul/15 14:30
• Updated: 05/Jan/24 16:43
• Resolved: 13/Jun/20 13:29

Description

When running:

test.groovy

class X {
    Closure action = {}
}

trait T {

    void say(String text) {
        println text
    }

    @groovy.transform.CompileStatic
    X getX() {
        new X(action: {
            say "Hello!"
        })
    }

}

class A implements T {
}

new A().x.action()

The following exception is thrown:

Caught: java.lang.ClassCastException: java.lang.Class cannot be cast to T
java.lang.ClassCastException: java.lang.Class cannot be cast to T
	at T$Trait$Helper$_getX_closure1.doCall(test.groovy:14)
	at T$Trait$Helper$_getX_closure1.doCall(test.groovy)
	at test.run(test.groovy:23)

This is only happening on groovy 2.4.4. Removing the static compilation annotation or reverting to groovy version 2.4.3 makes the code work.

The commit that is causing this problem seems to be: 1bbed25aa3a08bc0cb7e14e49a1e7c2b82f21a26