Today's nightly fails with cannot find libz.so.1

[OmnipotentEntity]

Minimal nix-shell to reproduce:

with import <nixpkgs> {};
let src = fetchFromGitHub {
    owner = "mozilla";
    repo = "nixpkgs-mozilla";
    rev = "e912ed483e980dfb4666ae0ed17845c4220e5e7c";
    sha256 = "08fvzb8w80bkkabc1iyhzd15f4sm7ra10jn32kfch5klgl0gj3j3";
  };
in
with import "${src.out}/rust-overlay.nix" pkgs pkgs;
stdenv.mkDerivation (with pkgs; {
  name = "rust-env";

  nativeBuildInputs = [
    latest.rustChannels.nightly.rust
    #latest.rustChannels.beta.rust #works fine.
  ];
})

Then launch nix-shell and run $ rustc -V

Output expected: The nightly version string

Output received: "rustc: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory"

Further information:

ldd for nightly rustc:

	linux-vdso.so.1 (0x00007ffdc65db000)
	librustc_driver-5e50657ff02a973e.so => /nix/store/ni1af6hmg2s7zl1dlhmc0l922c9n1z6s-rust-1.46.0-nightly-2020-06-21-a8cf39911/bin/../lib/librustc_driver-5e50657ff02a973e.so (0x000015540b3e8000)
	libstd-b6aff3703feff874.so => /nix/store/ni1af6hmg2s7zl1dlhmc0l922c9n1z6s-rust-1.46.0-nightly-2020-06-21-a8cf39911/bin/../lib/libstd-b6aff3703feff874.so (0x000015540b0e7000)
	libpthread.so.0 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libpthread.so.0 (0x000015540b0c6000)
	libdl.so.2 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libdl.so.2 (0x000015540b0c1000)
	librt.so.1 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/librt.so.1 (0x000015540b0b7000)
	libc.so.6 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libc.so.6 (0x000015540aef6000)
	/nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/ld-linux-x86-64.so.2 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib64/ld-linux-x86-64.so.2 (0x000015540f99e000)
	libLLVM-10-rust-1.46.0-nightly.so => /nix/store/ni1af6hmg2s7zl1dlhmc0l922c9n1z6s-rust-1.46.0-nightly-2020-06-21-a8cf39911/bin/../lib/../lib/libLLVM-10-rust-1.46.0-nightly.so (0x000015540688f000)
	libgcc_s.so.1 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libgcc_s.so.1 (0x0000155406875000)
	libm.so.6 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libm.so.6 (0x0000155406735000)
	libz.so.1 => not found

ldd for beta rustc:

	linux-vdso.so.1 (0x00007fff96d32000)
	librustc_driver-3ec13ed752f7a54a.so => /nix/store/ih1vfc2zs0vqiw1j0n12zh60d5cd93sh-rust-1.45.0-beta.2-2020-06-15-1dc0f6d8e/bin/../lib/librustc_driver-3ec13ed752f7a54a.so (0x000014861b969000)
	libstd-44f8eb3d0b2fad61.so => /nix/store/ih1vfc2zs0vqiw1j0n12zh60d5cd93sh-rust-1.45.0-beta.2-2020-06-15-1dc0f6d8e/bin/../lib/libstd-44f8eb3d0b2fad61.so (0x000014861b666000)
	libpthread.so.0 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libpthread.so.0 (0x000014861b645000)
	libdl.so.2 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libdl.so.2 (0x000014861b640000)
	librt.so.1 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/librt.so.1 (0x000014861b636000)
	libc.so.6 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libc.so.6 (0x000014861b475000)
	/nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/ld-linux-x86-64.so.2 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib64/ld-linux-x86-64.so.2 (0x000014861fed6000)
	libLLVM-10-rust-1.45.0-beta.so => /nix/store/ih1vfc2zs0vqiw1j0n12zh60d5cd93sh-rust-1.45.0-beta.2-2020-06-15-1dc0f6d8e/bin/../lib/../lib/libLLVM-10-rust-1.45.0-beta.so (0x0000148616e7a000)
	libgcc_s.so.1 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libgcc_s.so.1 (0x0000148616e60000)
	libm.so.6 => /nix/store/9hy6c2hv8lcwc6clnc1p2jf09cs5q9dp-glibc-2.30/lib/libm.so.6 (0x0000148616d20000)

(New dependency on libz?)

[cole-h]

Probably related: NixOS/nixpkgs#91314.

[witchof0x20]

NixOS/nixpkgs#91327

Here's the fix I wrote for nixpkgs/rustup. It appears the minimal change that needs to be made is adding zlib to the RPATH for libLLVM-10-rust-1.45.0-beta.so because of rust-lang/rust#72696

[bkchr]

#227 fixes this bug