collect-once-hashmap 0.2.0

A hashmap that can be collected only when there are unique keys in the iterator
Documentation 
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{ ... }:

let
  moz_overlay = import (
    builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz
  );

  pkgs = import <nixpkgs> { overlays = [ moz_overlay ]; };

in
pkgs.mkShell {
  buildInputs = with pkgs; [
    rustChannels.stable.rust-std
    rustChannels.stable.rust
    rustChannels.stable.rustc
    rustChannels.stable.cargo
  ];

  LIBCLANG_PATH   = "${pkgs.llvmPackages.libclang}/lib";
}