[GROOVY-5894] Left shift on collection fails for list with CompileStatic

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.6
• Fix Version/s: 2.1.1
• Component/s: Static compilation
• Assignee: Cédric Champeau
• Reporter: Tim Yates
• Created: 09/Jan/13 06:32
• Updated: 16/Feb/13 00:47
• Resolved: 11/Feb/13 03:11

Description

Don't think I've reported this before...

This code works fine:

@groovy.transform.CompileStatic
def List<Integer> append( Closure<Integer> method ) {
  List<Integer> ret = []
  ret << method()
}

Closure<Integer> cl = { 2 }

// prints '[2]'
println append( cl )

However, if you use a generic placeholder like so:

@groovy.transform.CompileStatic
def <T> List<T> append( Closure<T> method ) {
  List<T> ret = []
  ret << method()
}

Closure<Integer> cl = { 2 }

println append( cl )

You get:

[Static type checking] - Cannot call 
  org.codehaus.groovy.runtime.DefaultGroovyMethods#leftShift(java.util.Collection <T>, java.lang.Object)
  with arguments [java.util.List <T>, java.lang.Object] 

Shouldn't that be ok?