cargo fmt --all -- --check issues error for crate that is not part of either the workspace or the path dependencies.

[taiki-e]

https://dev.azure.com/tokio-rs/Tokio/_build/results?buildId=1748&view=logs

Diff in /usr/share/rust/.cargo/registry/src/github.com-1ecc6299db9ec823/tokio-codec-0.1.1/src/bytes_codec.rs at line 1:
-use bytes::{Bytes, BufMut, BytesMut};
-use tokio_io::_tokio_codec::{Encoder, Decoder};
+use bytes::{BufMut, Bytes, BytesMut};
 use std::io;
+use tokio_io::_tokio_codec::{Decoder, Encoder};

toolchain: nightly-2019-08-01, (Probably nightly-2019-07-18 and later, it didn't happen in nightly-2019-07-17 or earlier versions)

[calebcartwright]

Think I know why this one is happening (unintended side effect of #3664)

tokio-codec is a member of the top level workspace, but it's also separately consumed from crates.io by other dependencies in the broader dependency tree as seen in the cargo metadata output.

The check used for the All strategy is incorrectly including those non-local dependencies because the non-local dependency name (tokio-codec) also happens to match the name of a workspace member. Augmenting that check should resolve this issue