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...

see the revision history for lock files, if required

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{ lib ? import <nixpkgs/lib>, pkgs ? import <nixpkgs> { config.checkMeta = true; }, config ? pkgs.config }: let

  extendedMetaAttrs = [ "agsRoles" ];

  removeExtendedFromMeta = attrs: attrs // (lib.optionalAttrs (attrs ? meta) {
    meta = builtins.removeAttrs attrs.meta extendedMetaAttrs;
  });
  getExtendedMeta = attrs: lib.filterAttrs
    (n: _: builtins.elem n extendedMetaAttrs)
    (attrs.meta or {})

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{ pkgs ? import ./. {} }: let
  overlay = f: p: let base = p.llvmPackages_15; in {
    llvmPackages_15 = let
      patch = f.fetchpatch {
        url = "https://github.com/llvm/llvm-project/commit/57c7bb3ec89565c68f858d316504668f9d214d59.patch";
        hash = "sha256-AaM9A6tQ4YAw7uDqCIV4VaiUyLZv+unwcOqbakwW9/k=";
        relative = "libcxx";
      };

      tools = base.tools;

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// We want to slice and dice our opcode map on:
//  - opcode byte
//  - opcode map (aka leading opcode bytes; if present)
//  - prefixes
//
// Unfortunately, C doesn't have pattern matching. The macros that follow are
// our (unfortunate) facsimile.
//
// Essentially we are — in the style of `disas_insn` — appropriating the upper

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#! /usr/bin/env nix-shell
#! nix-shell -i bash -p bash coreutils procps cpuset which

# shellcheck shell=bash

# Based on suggestions from here: https://llvm.org/docs/Benchmarking.html.
# Also see: https://juliaci.github.io/BenchmarkTools.jl/dev/linuxtips/.
# And: https://man7.org/linux/man-pages/man7/cpuset.7.html.

set -euo pipefail

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{
  inputs = {
    nixpkgs-working.url = github:NixOS/nixpkgs/2ebb6c1e5ae402ba35cca5eec58385e5f1adea04;
    nixpkgs-broken.url = github:NixOS/nixpkgs/nixos-unstable; # d917136f550a8c36efb1724390c7245105f79023 as of this writing

    nixpkgs-test.url = github:NixOS/nixpkgs/2fe19fe24a225c33c4011ee9dbc0b4310b798134;
  };

  outputs = { self, nixpkgs-working, nixpkgs-broken, nixpkgs-test }: let
    old = nixpkgs-working.legacyPackages.x86_64-linux;

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{ lib
, phases ? [
    "Patch"
    "Unpack"
    "Configure"
    "Build"
    "Install"
    "Check"
    "InstallCheck"
  ]

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//! Implementation of the [Playfair cipher].
//!
//! [Playfair cipher]: https://en.wikipedia.org/wiki/Playfair_cipher

#![cfg_attr(feature = "no_std", no_std)]
#![cfg_attr(all(docs, not(doctest)), feature(doc_auto_cfg))]

use core::fmt::{self, Display};

// Normally we'd use a `std` feature instead of a `no_std` feature (this works

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{ nixpkgs ? ./.
, lib ? import ./lib

# Host systems to test from.
, systems ? [
    "i686-linux"

    "x86_64-linux"
    # "x86_64-darwin"

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# Look at `lib/customization.nix`, specifically `makeOverridable`.
#
# ```
# func(args) -> Res
#
# override:
#   func( override(args) ) -> Res
# where override :: Args -> Args
#   + to reinsert the overrides: `makeOverridable func override(args)`
#