False positive `no-unreachable`

[wcjohnson]

Minimum test case looks like:

match 1:
  | else: throw 2

3

This is a problem with the linter's CodePathAnalyzer, which can't be overridden by plugins. It's seeing the throw and not realizing it's in a separate code path.

[wcjohnson]

See: eslint/eslint#10823

[wcjohnson]

Interesting:

https://github.com/helixbass/eslint-plugin-coffee/blob/master/src/patch-code-path-analysis.coffee