• Adam Klein's avatar
    [parsing] Add a UseCounter for labeled expression statements · 946f78a0
    Adam Klein authored
    This was suggested by bmeurer after running into the confusing
    example of:
    
      x => {x:x}
    
    which might appear to be an arrow function that returns an object
    literal containing its argument, but instead is an arrow function
    that does nothing.
    
    While it's unclear whether the language would change to make this
    probable programmer error an actual syntax error, we can at least
    gather some data on the question of whether we see any such code
    in the wild.
    
    Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
    Change-Id: I08202039ecf7a7a4c71ad95ecd839436b4ec2af8
    Reviewed-on: https://chromium-review.googlesource.com/600888
    Commit-Queue: Adam Klein <adamk@chromium.org>
    Reviewed-by: 's avatarBenedikt Meurer <bmeurer@chromium.org>
    Reviewed-by: 's avatarMarja Hölttä <marja@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#47171}
    946f78a0
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