Dependency in workspace not recompiled after compiler version change

[euclio]

Steps to reproduce

1. Create a new crate.
2. Inside that crate, create another crate. This crate should be both a path dependency and a workspace member of the root crate.
3. Compile both crates.
4. Change your compiler version (using rustup, etc.)
5. Compile the member crate.
6. Compile the root crate.

You should get an error found crate "member" compiled by an incompatible version of rustc.

Expected behavior

The dependency is recompiled using the new compiler.

You can see this error happening in the rust-rosetta CI here. It seems that the artifacts in the cache were compiled with an older nightly, so the compilation failed.

[IvanUkhov]

I’ve experienced a similar problem. After updating the compiler, I tried to run the tests in the nested crate, and I got the following error:

error: found crate `foo` compiled by an incompatible version of rustc [E0514]
help: please recompile that crate using this compiler (rustc 1.12.0-nightly (936bfea94 2016-07-20))

I believe it should have been automatically recompiled.

[alexcrichton]

Thanks for the report! After investigating I've concluded that this is a dupe of #2897, so I'm going to close in favor of that.

[euclio]

@alexcrichton looks like you linked back to this issue 😄 what is the dupe number?

[alexcrichton]

Gah sorry about that! I meant to link to #2855