esmeta doesn’t support ~~ in grammar

[mathiasbynens]

See tc39/ecma262#2418 (comment). As part of this patch, we define a grammar that includes ~~:

      <emu-grammar type="definition">
        ClassSetReservedDoublePunctuator :: one of
          `&amp;&amp;` `!!` `##`
          `$$` `%%` `**`
          `++` `,,` `..`
          `::` `;;` `&lt;&lt;`
          `==` `&gt;&gt;` `??`
          `@@` `^^` `&grave;&grave;`
          `~~`
      </emu-grammar>

It seems esmeta doesn’t like this for some reason. The check fails: https://github.com/tc39/ecma262/actions/runs/5088350689/jobs/9144652112?pr=2418#step:7:1

Run "${ESMETA_HOME}"/bin/esmeta tycheck -status -tycheck:log -tycheck:ignore=esmeta-ignore.json
========================================
 extract phase
----------------------------------------
[ESMeta v0.3.0] [Parser (List[spec.Production])] [2[8](https://github.com/tc39/ecma262/actions/runs/5088350689/jobs/9144652112?pr=2418#step:7:9).[12](https://github.com/tc39/ecma262/actions/runs/5088350689/jobs/9144652112?pr=2418#step:7:13)] failure: end of input expected

          `~~`
           ^
Error: Process completed with exit code 1.

@bakkot said:

No idea what's up with that one; probably an esmeta bug. We'll turn the check off or fix esmeta before merging

It would be great if this could be fixed in esmeta.

[jhnaldo]

Hi, @mathiasbynens. Thanks for your kind report on the bugs in the current version of ESMeta.
Since I fixed this issue in #146, I closed this issue.