DSL EXPRESSION:
$x=1;$y=2;


AST:
"block" [tt:block] [nt:StatementBlock]
    "=" [tt:equals] [nt:Assignment]
        "$x" [tt:field_name] [nt:DirectFieldValue]
        "1" [tt:int_literal] [nt:int_literal]
    "=" [tt:equals] [nt:Assignment]
        "$y" [tt:field_name] [nt:DirectFieldValue]
        "2" [tt:int_literal] [nt:int_literal]

