FuzzILTool Error

I have a JavaScript file:

let a = function() {
    return {}
 };

  for (let j = 0; j < 999; j++) {
    ((a = class b3 {[{c: eval()}]}) => {})();
    if (j == 8) {
      a();
    }
  }

I want to compile it into a .fzil file, but I encountered an error：

>swift run -c release FuzzILTool --compile ./tmp/tmp.js 
Building for production...
Build complete! (0.18s)
Failed to parse ./tmp/tmp.js: parsingFailed("\n/home/fuzzer/myspace/tools/fuzzilli/.build/x86_64-unknown-linux-gnu/release/Fuzzilli_Fuzzilli.resources/Parser/parser.js:19\n            throw \"Assertion failed\";\n            ^\nAssertion failed\n(Use `node --trace-uncaught ...` to show where the exception was thrown)\n")

When I remove the line ((a = class b3 {[{c: eval()}]}) => {})();, it compiles successfully. However, I cannot remove this line.

Reproduce the failure with FuzzILTool --compile ./tmp/tmp.js using the JavaScript snippet in the report. Start at the parser failure reported in parser.js:19 and trace how the ((a = class b3 {[{c: eval()}]}) => {})(); expression is handled. Done means the reproducer compiles into a .fzil file without the assertion failure.