/usr/lib/llvm-3.5/include/clang-c/module.modulemap is in libclang-3.5-dev 1:3.5.2-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | module Clang_C {
umbrella "."
module * { export * }
}
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