DSL EXPRESSION:
end{$x=1}

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

