[GROOVY-5758] @CompileStatic complains about ArrayList not being a String, but doesn't so about HashSet. Seems inconsistent.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.5
• Fix Version/s: 2.0.6
• Component/s: Compiler
• Environment: Hapens with eclipse-java-juno-SR1-win32 with Groovy plugin as well as with IntelliJ IDea 21 EAP with Groovy 2.0.5
• Assignee: Cédric Champeau
• Reporter: Oliver Plow
• Created: 15/Oct/12 02:48
• Updated: 22/Dec/12 01:10
• Resolved: 20/Nov/12 08:17

Description

@CompileStatic
class MyGroove {

    private String str = null;

    def static main(args)
    {
        MyGroove myGroove = new MyGroove();
        println myGroove.str
        myGroove.str = "abc"
        println myGroove.str.getClass()
        myGroove.str = new HashSet<String>()    // compiles fine
        println myGroove.str    // prints "[]" to the console

        // does not compile: [Static type checking] - Cannot assign 
        // value of type java.util.ArrayList to variable of 
        // type java.lang.String
        myGroove.str = new ArrayList<String>()
    }

}