Add new import macro prototype.
#1142
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UebelAndre
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Feb 17, 2022
directory var when renaming is enabled.
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This PR implements the experimental import macro discussed in #1008 and #1013. This macro is the compiler-side of the changes required to do this renaming, so that the compiler looks for the crate using the correct name.
The macro reads two environment variables, in order to be aware of whether renaming is turned on for this repository, and if so, which directory is considered "third-party" (and therefore should not be renamed).