[GROOVY-7729] DefaultGroovyMethods.sum(Iterable) is not CompileStatic aware

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 2.4.4, 2.4.5
• Component/s: groovy-jdk
• Environment: JDK 1.8.0_51/win32
• Assignee: Unassigned
• Reporter: Fabiano Biagini
• Created: 13/Jan/16 21:48
• Updated: 15/Jan/16 18:27
• Resolved: 15/Jan/16 18:27

Description

@groovy.transform.CompileStatic
void bug() {
    int a = [1,2,3].sum()
}

The code above works correctly with CompileDynamic, but CompileStatic will produce the following error:

[Static type checking] - Cannot assign value of type java.lang.Object to variable of type int

Seems to be a problem of DefaultGroovyMethods.sum(Iterable).

I think it just need to be changed from

public static Object sum(Iterable self)

to

public static <T> T sum(Iterable<T> self)