Adding tests
Implemented more operators
Implemented GString
Implemented the backside of the switch/case statements
Tied switch/case to CPS transformation.
I wasn't handling the fall through correctly
The first test for switch/case and bug fixes discovered by it
More test cases
More tests
Testing the isCase method
'break' is already tested heavily
More tests for switch/case
More tests for switch/case
Groovy itself doesn't handle this correctly.
These test cases are complete
Implemented support for static method call expression

According to the usage search, this AST node gets created only in very limited situations
Implemented "exp ? exp : exp"
added another test for a ternary operator
Implemented elvis operator
Implemented FieldExpression support, but compiler doesn't appear to produce this.