[GROOVY-5780] CompileStatic - Calling vargarg parameter GString is converted to array of strings

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.0.5
• Fix Version/s: 2.0.6
• Component/s: Compiler, Static compilation
• Environment: Windows 7, JDK 1.7.0_09 64 bits, Groovy 2.0.5 (windows installer)
• Assignee: Cédric Champeau
• Reporter: Boaz Nahum
• Created: 02/Nov/12 06:12
• Updated: 22/Dec/12 01:10
• Resolved: 20/Nov/12 03:14

Description

OOPS... It happens again, almost the same bug as http://jira.codehaus.org/browse/GROOVY-5703
But now we call with GString instead of String

Assume we have this method:

static void printMsgs(String ... msgs) {
    for(String s : msgs) { println s;}
}

Calling it from @CompileStatic:

@CompileStatic
    static void testCS() {
        String n1="hello"
        //Print:
        // H
        // e
        // l
        // l
        // o
        printMsgs("${n1}");
    }

The string 'hello' is converted to array of strings.

Calling it from non CompileStatic works fines.
Also if the passed parameter is String and not GString then it also works fine.

The complete test case:

import groovy.transform.CompileStatic

public class CompileStaticVarArg {

    static void main(String[] args) {

        println GroovySystem.version
        println '-' * 20

        test();

        println '-' * 20

        testCS()

    }


    static void test() {
        String n1="hello"
        // Print 'hello'
        printMsgs("${n1}");
    }

    @CompileStatic
    static void testCS() {
        String n1="hello"
        //Print:
        // H
        // e
        // l
        // l
        // o
        printMsgs("${n1}");
    }

    //@CompileStatic
    static void printMsgs(String... msgs) {

        for (String s : msgs) {
            println s;
        }

    }

}