eslint reporting no-unused-vars when variable is declared as @const and used in the key of an #each

[OlsonDev]

Describe the bug

I'm not sure if this belongs here or on the eslint issues, but I suspect here is more accurate.

I have a generic Grid component that has the ability to have sub-rows within it. I have a piece of logic that looks like:

            {#each _rows as row, i (rowKey(row))}
              {@const _subRows = subRows(row)}
              {@const hasSubRows = row !== _subRows}
              {@const rowspan = hasSubRows ? getCount(_subRows) : null}
              {@const __rows = hasSubRows ? _subRows : [row]}
              {@const keyFunc = hasSubRows ? subRowKey : rowKey}
              {#each __rows as subRow, j (keyFunc(subRow))}
                <tr
                  ...attributes>
                    ...inner HTML content
                </tr>
              {/each}

and eslint is reporting:

  69:23  error  'keyFunc' is assigned a value but never used  no-unused-vars

This will unfortunately prevent our build pipeline from accepting this build. I've tried adding <!-- eslint-disable-next-line no-unused-vars --> before, but that doesn't seem to fix it.

By the way, the code does compile and run perfectly.

Thanks!

Reproduction

Here's a fairly minimal reproduction: REPL -- if the REPL supports eslint, I couldn't figure out how to enable it.

Logs

No response

System Info

System:
    OS: Windows 10 10.0.19044
    CPU: (16) x64 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz
    Memory: 7.67 GB / 31.73 GB
  Binaries:
    Node: 18.10.0 - C:\Program Files\nodejs\node.EXE
    npm: 7.19.1 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Edge: Spartan (44.19041.1266.0), Chromium (108.0.1462.46)
    Internet Explorer: 11.0.19041.1566
  npmPackages:
    svelte: ^3.53.0 => 3.52.0
    webpack: ^5.75.0 => 5.74.0

### Severity

annoyance

[Conduitry]

If this is still happening, it should be reported in the ESLint plugin repo - https://github.com/sveltejs/eslint-plugin-svelte