text: "use strict";
  
  // Fix back button cache problem
  window.onunload = function() {};
  
  // Global variable, shared between modules
  function playpen_text(playpen) {
    let code_block = playpen.querySelector("code");
  
    if (window.ace && code_block.classList.contains("editable")) {
      let editor = window.ace.edit(code_block);
      return editor.getValue();
    } else {
      return code_block.textContent;
    }
  }
  
  (function codeSnippets() {
    // Hide Rust code lines prepended with a specific character
    var hiding_character = "#";
  
    var playpens = Array.from(document.querySelectorAll(".playpen"));
    if (playpens.length > 0) {
      fetch("https://play.rust-lang.org/meta/crates", {
        headers: {
          "Content-Type": "application/json"
        },
        method: "POST",
        mode: "cors"
      })
        .then(response => response.json())
        .then(response => {
          // get list of crates available in the rust playground
          let playground_crates = response.crates.map(item => item["id"]);
          playpens.forEach(block =>
            handle_crate_list_update(block, playground_crates)
          );
        });
    }
  
    function handle_crate_list_update(playpen_block, playground_crates) {
      // update the play buttons after receiving the response
      update_play_button(playpen_block, playground_crates);
  
      // and install on change listener to dynamically update ACE editors
      if (window.ace) {
        let code_block = playpen_block.querySelector("code");
        if (code_block.classList.contains("editable")) {
          let editor = window.ace.edit(code_block);
          editor.addEventListener("change", function(e) {
            update_play_button(playpen_block, playground_crates);
          });
        }
      }
    }
  
    // updates the visibility of play button based on `no_run` class and
    // used crates vs ones available on http://play.rust-lang.org
    function update_play_button(pre_block, playground_crates) {
      var play_button = pre_block.querySelector(".play-button");
  
      // skip if code is `no_run`
      if (pre_block.querySelector("code").classList.contains("no_run")) {
        play_button.classList.add("hidden");
        return;
      }
  
      // get list of `extern crate`'s from snippet
      var txt = playpen_text(pre_block);
      var re = /extern\s+crate\s+([a-zA-Z_0-9]+)\s*;/g;
      var snippet_crates = [];
      var item;
      while ((item = re.exec(txt))) {
        snippet_crates.push(item[1]);
      }
  
      // check if all used crates are available on play.rust-lang.org
      var all_available = snippet_crates.every(function(elem) {
        return playground_crates.indexOf(elem) > -1;
      });
  
      if (all_available) {
        play_button.classList.remove("hidden");
      } else {
        play_button.classList.add("hidden");
      }
    }
  
    function run_rust_code(code_block) {
      var result_block = code_block.querySelector(".result");
      if (!result_block) {
        result_block = document.createElement("code");
        result_block.className = "result hljs language-bash";
  
        code_block.append(result_block);
      }
  
      let text = playpen_text(code_block);
  
      var params = {
        channel: "stable",
        mode: "debug",
        crateType: "bin",
        tests: false,
        code: text
      };
  
      if (text.indexOf("#![feature") !== -1) {
        params.channel = "nightly";
      }
  
      result_block.innerText = "Running...";
  
      var request = fetch("https://play.rust-lang.org/execute", {
        headers: {
          "Content-Type": "application/json"
        },
        method: "POST",
        mode: "cors",
        body: JSON.stringify(params)
      });
  
      request
        .then(function(response) {
          return response.json();
        })
        .then(function(response) {
          result_block.innerText = response.success
            ? response.stdout
            : response.stderr;
        })
        .catch(function(error) {
          result_block.innerText = "Playground communication" + error.message;
        });
    }
  
    // Syntax highlighting Configuration
    hljs.configure({
      tabReplace: "    ", // 4 spaces
      languages: [] // Languages used for auto-detection
    });
  
    if (window.ace) {
      // language-rust class needs to be removed for editable
      // blocks or highlightjs will capture events
      Array.from(document.querySelectorAll("code.editable")).forEach(function(
        block
      ) {
        block.classList.remove("language-rust");
      });
  
      Array.from(document.querySelectorAll("code:not(.editable)")).forEach(
        function(block) {
          hljs.highlightBlock(block);
        }
      );
    } else {
      Array.from(document.querySelectorAll("code")).forEach(function(block) {
        hljs.highlightBlock(block);
      });
    }
  
    // Adding the hljs class gives code blocks the color css
    // even if highlighting doesn't apply
    Array.from(document.querySelectorAll("code")).forEach(function(block) {
      block.classList.add("hljs");
    });
  
    Array.from(document.querySelectorAll("code.language-rust")).forEach(function(
      block
    ) {
      var code_block = block;
      var pre_block = block.parentNode;
      // hide lines
      var lines = code_block.innerHTML.split("\n");
      var first_non_hidden_line = false;
      var lines_hidden = false;
      var trimmed_line = "";
  
      for (var n = 0; n < lines.length; n++) {
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        if (
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          trimmed_line[1] != hiding_character
        ) {
          if (first_non_hidden_line) {
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              lines[n].replace(/(\s*)# ?/, "$1") +
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          } else {
            lines[n] =
              '<span class="hidden">' +
              lines[n].replace(/(\s*)# ?/, "$1") +
              "\n" +
              "</span>";
          }
          lines_hidden = true;
        } else if (first_non_hidden_line) {
          lines[n] = "\n" + lines[n];
        } else {
          first_non_hidden_line = true;
        }
        if (
          trimmed_line[0] == hiding_character &&
          trimmed_line[1] == hiding_character
        ) {
          lines[n] = lines[n].replace("##", "#");
        }
      }
      code_block.innerHTML = lines.join("");
  
      // If no lines were hidden, return
      if (!lines_hidden) {
        return;
      }
  
      var buttons = document.createElement("div");
      buttons.className = "buttons";
      buttons.innerHTML =
        '<button class="fa fa-expand" title="Show hidden lines" aria-label="Show hidden lines"></button>';
  
      // add expand button
      pre_block.insertBefore(buttons, pre_block.firstChild);
  
      pre_block.querySelector(".buttons").addEventListener("click", function(e) {
        if (e.target.classList.contains("fa-expand")) {
          var lines = pre_block.querySelectorAll("span.hidden");
  
          e.target.classList.remove("fa-expand");
          e.target.classList.add("fa-compress");
          e.target.title = "Hide lines";
          e.target.setAttribute("aria-label", e.target.title);
  
          Array.from(lines).forEach(function(line) {
            line.classList.remove("hidden");
            line.classList.add("unhidden");
          });
        } else if (e.target.classList.contains("fa-compress")) {
          var lines = pre_block.querySelectorAll("span.unhidden");
  
          e.target.classList.remove("fa-compress");
          e.target.classList.add("fa-expand");
          e.target.title = "Show hidden lines";
          e.target.setAttribute("aria-label", e.target.title);
  
          Array.from(lines).forEach(function(line) {
            line.classList.remove("unhidden");
            line.classList.add("hidden");
          });
        }
      });
    });
  
    Array.from(document.querySelectorAll("pre code")).forEach(function(block) {
      var pre_block = block.parentNode;
      if (!pre_block.classList.contains("playpen")) {
        var buttons = pre_block.querySelector(".buttons");
        if (!buttons) {
          buttons = document.createElement("div");
          buttons.className = "buttons";
          pre_block.insertBefore(buttons, pre_block.firstChild);
        }
  
        var clipButton = document.createElement("button");
        clipButton.className = "fa fa-copy clip-button";
        clipButton.title = "Copy to clipboard";
        clipButton.setAttribute("aria-label", clipButton.title);
        clipButton.innerHTML = '<i class="tooltiptext"></i>';
  
        buttons.insertBefore(clipButton, buttons.firstChild);
      }
    });
  
    // Process playpen code blocks
    Array.from(document.querySelectorAll(".playpen")).forEach(function(
      pre_block
    ) {
      // Add play button
      var buttons = pre_block.querySelector(".buttons");
      if (!buttons) {
        buttons = document.createElement("div");
        buttons.className = "buttons";
        pre_block.insertBefore(buttons, pre_block.firstChild);
      }
  
      var runCodeButton = document.createElement("button");
      runCodeButton.className = "fa fa-play play-button";
      runCodeButton.hidden = true;
      runCodeButton.title = "Run this code";
      runCodeButton.setAttribute("aria-label", runCodeButton.title);
  
      var copyCodeClipboardButton = document.createElement("button");
      copyCodeClipboardButton.className = "fa fa-copy clip-button";
      copyCodeClipboardButton.innerHTML = '<i class="tooltiptext"></i>';
      copyCodeClipboardButton.title = "Copy to clipboard";
      copyCodeClipboardButton.setAttribute(
        "aria-label",
        copyCodeClipboardButton.title
      );
  
      buttons.insertBefore(runCodeButton, buttons.firstChild);
      buttons.insertBefore(copyCodeClipboardButton, buttons.firstChild);
  
      runCodeButton.addEventListener("click", function(e) {
        run_rust_code(pre_block);
      });
  
      let code_block = pre_block.querySelector("code");
      if (window.ace && code_block.classList.contains("editable")) {
        var undoChangesButton = document.createElement("button");
        undoChangesButton.className = "fa fa-history reset-button";
        undoChangesButton.title = "Undo changes";
        undoChangesButton.setAttribute("aria-label", undoChangesButton.title);
  
        buttons.insertBefore(undoChangesButton, buttons.firstChild);
  
        undoChangesButton.addEventListener("click", function() {
          let editor = window.ace.edit(code_block);
          editor.setValue(editor.originalCode);
          editor.clearSelection();
        });
      }
    });
  })();
  
  (function themes() {
    var html = document.querySelector("html");
    var themeToggleButton = document.getElementById("theme-toggle");
    var themePopup = document.getElementById("theme-list");
    var themeColorMetaTag = document.querySelector('meta[name="theme-color"]');
    var stylesheets = {
      ayuHighlight: document.querySelector("[href$='ayu-highlight.css']"),
      tomorrowNight: document.querySelector("[href$='tomorrow-night.css']"),
      highlight: document.querySelector("[href$='highlight.css']")
    };
  
    function showThemes() {
      themePopup.style.display = "block";
      themeToggleButton.setAttribute("aria-expanded", true);
      themePopup.querySelector("button#" + document.body.className).focus();
    }
  
    function hideThemes() {
      themePopup.style.display = "none";
      themeToggleButton.setAttribute("aria-expanded", false);
      themeToggleButton.focus();
    }
  
    function set_theme(theme) {
      let ace_theme;
  
      if (theme == "coal" || theme == "navy") {
        stylesheets.ayuHighlight.disabled = true;
        stylesheets.tomorrowNight.disabled = false;
        stylesheets.highlight.disabled = true;
  
        ace_theme = "ace/theme/tomorrow_night";
      } else if (theme == "ayu") {
        stylesheets.ayuHighlight.disabled = false;
        stylesheets.tomorrowNight.disabled = true;
        stylesheets.highlight.disabled = true;
  
        ace_theme = "ace/theme/tomorrow_night";
      } else {
        stylesheets.ayuHighlight.disabled = true;
        stylesheets.tomorrowNight.disabled = true;
        stylesheets.highlight.disabled = false;
  
        ace_theme = "ace/theme/dawn";
      }
  
      setTimeout(function() {
        themeColorMetaTag.content = getComputedStyle(
          document.body
        ).backgroundColor;
      }, 1);
  
      if (window.ace && window.editors) {
        window.editors.forEach(function(editor) {
          editor.setTheme(ace_theme);
        });
      }
  
      var previousTheme;
      try {
        previousTheme = localStorage.getItem("mdbook-theme");
      } catch (e) {}
      if (previousTheme === null || previousTheme === undefined) {
        previousTheme = "light";
      }
  
      try {
        localStorage.setItem("mdbook-theme", theme);
      } catch (e) {}
  
      document.body.className = theme;
      html.classList.remove(previousTheme);
      html.classList.add(theme);
    }
  
    // Set theme
    var theme;
    try {
      theme = localStorage.getItem("mdbook-theme");
    } catch (e) {}
    if (theme === null || theme === undefined) {
      theme = "light";
    }
  
    set_theme(theme);
  
    themeToggleButton.addEventListener("click", function() {
      if (themePopup.style.display === "block") {
        hideThemes();
      } else {
        showThemes();
      }
    });
  
    themePopup.addEventListener("click", function(e) {
      var theme = e.target.id || e.target.parentElement.id;
      set_theme(theme);
    });
  
    themePopup.addEventListener("focusout", function(e) {
      // e.relatedTarget is null in Safari and Firefox on macOS (see workaround below)
      if (!!e.relatedTarget && !themePopup.contains(e.relatedTarget)) {
        hideThemes();
      }
    });
  
    // Should not be needed, but it works around an issue on macOS & iOS: https://github.com/rust-lang-nursery/mdBook/issues/628
    document.addEventListener("click", function(e) {
      if (
        themePopup.style.display === "block" &&
        !themeToggleButton.contains(e.target) &&
        !themePopup.contains(e.target)
      ) {
        hideThemes();
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    });
  
    document.addEventListener("keydown", function(e) {
      if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) {
        return;
      }
      if (!themePopup.contains(e.target)) {
        return;
      }
  
      switch (e.key) {
        case "Escape":
          e.preventDefault();
          hideThemes();
          break;
        case "ArrowUp":
          e.preventDefault();
          var li = document.activeElement.parentElement;
          if (li && li.previousElementSibling) {
            li.previousElementSibling.querySelector("button").focus();
          }
          break;
        case "ArrowDown":
          e.preventDefault();
          var li = document.activeElement.parentElement;
          if (li && li.nextElementSibling) {
            li.nextElementSibling.querySelector("button").focus();
          }
          break;
        case "Home":
          e.preventDefault();
          themePopup.querySelector("li:first-child button").focus();
          break;
        case "End":
          e.preventDefault();
          themePopup.querySelector("li:last-child button").focus();
          break;
      }
    });
  })();
  
  (function sidebar() {
    var html = document.querySelector("html");
    var sidebar = document.getElementById("sidebar");
    var sidebarLinks = document.querySelectorAll("#sidebar a");
    var sidebarToggleButton = document.getElementById("sidebar-toggle");
    var firstContact = null;
  
    function showSidebar() {
      html.classList.remove("sidebar-hidden");
      html.classList.add("sidebar-visible");
      Array.from(sidebarLinks).forEach(function(link) {
        link.setAttribute("tabIndex", 0);
      });
      sidebarToggleButton.setAttribute("aria-expanded", true);
      sidebar.setAttribute("aria-hidden", false);
      try {
        localStorage.setItem("mdbook-sidebar", "visible");
      } catch (e) {}
    }
  
    function hideSidebar() {
      html.classList.remove("sidebar-visible");
      html.classList.add("sidebar-hidden");
      Array.from(sidebarLinks).forEach(function(link) {
        link.setAttribute("tabIndex", -1);
      });
      sidebarToggleButton.setAttribute("aria-expanded", false);
      sidebar.setAttribute("aria-hidden", true);
      try {
        localStorage.setItem("mdbook-sidebar", "hidden");
      } catch (e) {}
    }
  
    // Toggle sidebar
    sidebarToggleButton.addEventListener("click", function sidebarToggle() {
      if (html.classList.contains("sidebar-hidden")) {
        showSidebar();
      } else if (html.classList.contains("sidebar-visible")) {
        hideSidebar();
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      }
    });
  
    document.addEventListener(
      "touchstart",
      function(e) {
        firstContact = {
          x: e.touches[0].clientX,
          time: Date.now()
        };
      },
      { passive: true }
    );
  
    document.addEventListener(
      "touchmove",
      function(e) {
        if (!firstContact) return;
  
        var curX = e.touches[0].clientX;
        var xDiff = curX - firstContact.x,
          tDiff = Date.now() - firstContact.time;
  
        if (tDiff < 250 && Math.abs(xDiff) >= 150) {
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            firstContact.x < Math.min(document.body.clientWidth * 0.25, 300)
          )
            showSidebar();
          else if (xDiff < 0 && curX < 300) hideSidebar();
  
          firstContact = null;
        }
      },
      { passive: true }
    );
  
    // Scroll sidebar to current active section
    var activeSection = sidebar.querySelector(".active");
    if (activeSection) {
      sidebar.scrollTop = activeSection.offsetTop;
    }
  })();
  
  (function chapterNavigation() {
    document.addEventListener("keydown", function(e) {
      if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) {
        return;
      }
      if (window.search && window.search.hasFocus()) {
        return;
      }
  
      switch (e.key) {
        case "ArrowRight":
          e.preventDefault();
          var nextButton = document.querySelector(".nav-chapters.next");
          if (nextButton) {
            window.location.href = nextButton.href;
          }
          break;
        case "ArrowLeft":
          e.preventDefault();
          var previousButton = document.querySelector(".nav-chapters.previous");
          if (previousButton) {
            window.location.href = previousButton.href;
          }
          break;
      }
    });
  })();
  
  (function clipboard() {
    var clipButtons = document.querySelectorAll(".clip-button");
  
    function hideTooltip(elem) {
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      elem.className = "fa fa-copy clip-button";
    }
  
    function showTooltip(elem, msg) {
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      elem.className = "fa fa-copy tooltipped";
    }
  
    var clipboardSnippets = new Clipboard(".clip-button", {
      text: function(trigger) {
        hideTooltip(trigger);
        let playpen = trigger.closest("pre");
        return playpen_text(playpen);
      }
    });
  
    Array.from(clipButtons).forEach(function(clipButton) {
      clipButton.addEventListener("mouseout", function(e) {
        hideTooltip(e.currentTarget);
      });
    });
  
    clipboardSnippets.on("success", function(e) {
      e.clearSelection();
      showTooltip(e.trigger, "Copied!");
    });
  
    clipboardSnippets.on("error", function(e) {
      showTooltip(e.trigger, "Clipboard error!");
    });
  })();
  
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  (function autoHideMenu() {
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        ) {
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        if (
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        ) {
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        previousScrollTop = document.scrollingElement.scrollTop;
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      { passive: true }
    );
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