Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
`[packages.mylibrary]` `subdir='mylibrary-test'` or `[packages]`
`mylibrary='mylibrary-test'`). These override the locations for the
specified packages (so you can, for example, have multiple trees with
-the same package in). The `subdir` values are also added to the list
-of directories where `Cargo.toml` should be massaged.
+the same package in). These subdirectories are also added to the list
+of places where `Cargo.toml` should be massaged.
Out-of-tree builds
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