[Webkit-unassigned] [Bug 195613] New: Webpage using CoffeeScript crashes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195613

            Bug ID: 195613
           Summary: Webpage using CoffeeScript crashes
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eelco at motif.co

Created attachment 364373

  --> https://bugs.webkit.org/attachment.cgi?id=364373&action=review

Files demonstrating the crash

On iOS 12.2 beta 4, using the CoffeeScript compiler* on a web page causes the page to crash.

This will happen for all but the most trivial CoffeeScript code.

To reproduce:
- Unzip attached `crash.zip`
- Host the files somewhere (`python -m SimpleHTTPServer`)
- Open the index.html on iOS 12.2 (either in the simulator or on a device)

Expected:
Page loads, console output is printed

Observed:
Page crashes on load.

*This might not happen with all version of the CoffeeScript compiler, I have not narrowed it down further.

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