Umbrella language/front-end JIRA for X10 2.3.1

XTENLANG-2733 What should we do about casts to instances of generic types?

XTENLANG-2764 Need to reconsider fine points of instantiating a generic type in a way that makes method overloading ambiguous

XTENLANG-2823 A "return" statement in an "at" expression should not be interpreted as the value being computed, but as a return from the enclosing method, and treated accordingly

XTENLANG-2851 Restrict implicit 'this' in at body

XTENLANG-2951 Local variable not correctly captured in field initialization expression of anonymous class

XTENLANG-2991 ArrayList[Rail[Int]] doesn't contain Rail[Int]s

XTENLANG-2700 Incorrect contexts for method/constructor type inference leads to less precise type inference

XTENLANG-2942 Constructor invocation should type expand before inferring types

XTENLANG-2948 Type synonyms not expanding correctly

XTENLANG-2958 Casting null to constrained type

XTENLANG-2992 Overriding an abstract method with a method returning null gives a Java compilation error

XTENLANG-2949 Guard on superclass isn't entailed when it ought to be

XTENLANG-2429 Add package declaration node to synthetic ASTs

XTENLANG-2469 Implement new 'at' and 'athome' constructs.

XTENLANG-1244 Compiler support for regression testing

XTENLANG-2683 Represent function type guards in the function type object, rather than in the method def of the base interface

XTENLANG-2938 Define operator this - (Int) on IntRange

XTENLANG-1913 Copying semantics: copying 'at' should not copy 'this'