[Webkit-unassigned] [Bug 203478] New: Poor Async/Await Syntax Error Message

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203478

            Bug ID: 203478
           Summary: Poor Async/Await Syntax Error Message
           Product: WebKit
           Version: Safari 13
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ezekielelin at me.com

The `await` keyword can only be used in functions marked `async.` When one tries to use it in a function not marked as such, evaluation fails with the error:

    function b() {
      const x = await "Hello";
    }

    SyntaxError: Unexpected string literal "Hello". Expected ';' after variable declaration.

This should instead say something like (copied from Firefox):

    SyntaxError: await is only valid in async functions and async generators

The correct code is:

    async function b() {
      const x = await "Hello";
    }

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