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When an archive fails to build, print the path
Currently the output on failure is as follows:
Compiling block-buffer v0.10.4
Compiling crypto-common v0.1.6
Compiling digest v0.10.7
Compiling sha2 v0.10.8
Compiling xz2 v0.1.7
error: failed to build archive: No such file or directory
error: could not compile `bootstrap` (lib) due to 1 previous error
Change this to print which file is being constructed, to give some hint about what is going on.
error: failed to build archive at `path/to/output`: No such file or directory
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.