`for ( async of` should be a syntax error

[Zzzen]

Bug Report

🔎 Search Terms

for async of syntax error

🕗 Version & Regression Information

• This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________

⏯ Playground Link

Playground link with relevant code

💻 Code

var async;
for (async of [42]) {}
console.log(async);

🙁 Actual behavior

no error reported.

🙂 Expected behavior

The compiler should throw a syntax error: Uncaught SyntaxError: The left-hand side of a for-of loop may not be 'async'.

context: tc39/ecma262#2034