Common Errors: Rustfmt

rustfmt may have failed to format

Restyled can fail with this error:

error: left behind trailing whitespace
    --> /code/src/lib.rs:1058
     |
1058 |         // 
     |           ^

warning: rustfmt may have failed to format. See previous 1 errors.

This is an open rustfmt bug: https://github.com/rust-lang/rustfmt/issues/2916.

Once rustfmt has been fixed, Restyled can update. For now, unfortunately, you have to either edit the code in a way that doesn't cause this bug, or exclude it from Restyled via .restyled.yaml.

expected one of `!`, `)`, `,`, `.`, `::`, `?`, `{`, or an operator, found keyword `move`

The rustfmt Restyler is built to run the 2015 "edition"*, and constructions only available in the 2018 edition may cause such syntax errors.

The fix is to specify your edition via arguments:

restylers:
  - rustfmt:
      arguments:
        - "--edition"
        - "2018"

Or by creating a rustfmt.toml for the project:

edition = "2018"

NOTE: Unfortunately, specifying edition in Cargo.toml only effects invocations of cargo fmt, and not direct invocations of rustfmt (as the Restyler must do in order to only restyle changed files).

*PRs welcome :)