resultish 0.1.6

A `Resultish` represents success (`Ok`), error (`Err`), or `Both`.
Documentation 
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{
  inputs = {
    # nixpkgs 21808d22b1cda1898b71cf1a1beb524a97add2c4
    #   https://lazamar.co.uk/nix-versions/?channel=nixos-unstable&package=cargo
    #   cargo 1.83
    nixpkgs.url = "github:nixos/nixpkgs/21808d22b1cda1898b71cf1a1beb524a97add2c4";
  };

  outputs = { nixpkgs, ... }:
    let
      systems = [ "aarch64-darwin" "aarch64-linux" "x86_64-darwin" "x86_64-linux" ];
      forEachSystem = function:
        nixpkgs.lib.genAttrs systems (system: function nixpkgs.legacyPackages.${system});
    in {
      devShells = forEachSystem (pkgs: {
        default = pkgs.mkShell {
          packages = [
            pkgs.cargo
            pkgs.clippy
            pkgs.rust-analyzer
            pkgs.rustc
            pkgs.rustfmt
          ];
          # Allow rust-analyzer to provide std docs
          RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
        };
      });
    };
}