[GROOVY-9914] map.collectEntries extension method variant returns Map<?,?>

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.0.8, 4.0.0-alpha-3
• Assignee: Eric Milles
• Reporter: Eric Milles
• Created: 27/Jan/21 14:36
• Updated: 02/May/21 09:16
• Resolved: 02/Mar/21 15:06

Description

Consider the following:

@groovy.transform.TypeChecked
void test(Map<String,String> one) {
  Map<String,Integer> two = one.collectEntries { k,v ->
    [k: v.hashCode()]
  }
}

Assignment to "two" produces the following error "[Static type checking] - Incompatible generic argument types. Cannot assign java.util.Map <?, ?> to: java.util.Map <String, Integer>".

The "collectEntries" variant called here returns "Map<?,?>"; all other variants return a parameterized type that is determined by the caller.