erlware/relx — pull request #263 by tsloughter (2014-11-10 00:24:48+00:00)
Title: move back to using format_error/1

Ok, so I had moved `format_error` to be `format_error/2` for use in `rebar3` as well. But came to realize that passing the `State` actually makes little sense, since we expect a provider that errors to return `{error, term()}`, so no `State`. Meaning cleanup is already done simply by ignoring any changes a crashed provider does to the state.