Add regression test for rust-lang#56098
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// ignore-wasm32-bare no libc to test ffi with
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// ignore-wasm32-bare no libc to test ffi with
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// ignore-sgx no libc
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// ignore-sgx no libc
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// Ensure no false positive on "unused extern crate" lint
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#![deny(unused_extern_crates)]
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#![feature(rustc_private)]
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#![feature(rustc_private)]
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extern crate libc;
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extern crate libc;
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