DSL EXPRESSION:
$x=2; end{@y=1}


AST:
"block" [tt:block] [nt:StatementBlock]
    "=" [tt:equals] [nt:Assignment]
        "$x" [tt:field_name] [nt:DirectFieldValue]
        "2" [tt:int_literal] [nt:int_literal]
    "end" [tt:kw_end] [nt:EndBlock]
        "block" [tt:block] [nt:StatementBlockInBraces]
            "block" [tt:block] [nt:StatementBlock]
                "=" [tt:equals] [nt:Assignment]
                    "@y" [tt:oosvar_name] [nt:DirectOosvarValue]
                    "1" [tt:int_literal] [nt:int_literal]

