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e81d84cc17
This is an alternative to #12158's `CARGO_WORKSPACE_DIR` that was implementing the solution to #3946 that previously discussed in the cargo team meeting. `CARGO_WORKSPACE_DIR` is a bit awkward to document / describe because its the effective workspace directory of the thing being built. If the thing being built doesn't have a workspace, it falls back to `CARGO_MANIFEST_DIR`. It would also be hard to take into account what the `CARGO_WORKSPACE_DIR` would be for path dependencies into foreign workspaces *and* it wouldn't solve the problem the user is having. What the user really wants is the CWD of rustc when it is invoked. This is much simpler to describe and is accurate when using a path dependency to a foreign package. Because the CWD is a much simpler mechanism to talk about, I figured we could diverge from our prior consensus and make it always present, rather than limiting it to tests. Remaining work for #3946: get this stabilized