diff --git a/src/librustdoc/html/static/main.js b/src/librustdoc/html/static/main.js
index 1ed94ec109c18..1e28056bb6882 100644
--- a/src/librustdoc/html/static/main.js
+++ b/src/librustdoc/html/static/main.js
@@ -764,138 +764,6 @@ function hideThemeButtonState() {
         innerToggle.children[0].innerText = labelForToggleButton(sectionIsCollapsed);
     }
 
-    function collapseDocs(toggle, mode) {
-        if (!toggle || !toggle.parentNode) {
-            return;
-        }
-
-        function adjustToggle(arg) {
-            return function(e) {
-                if (hasClass(e, "toggle-label")) {
-                    if (arg) {
-                        e.style.display = "inline-block";
-                    } else {
-                        e.style.display = "none";
-                    }
-                }
-                if (hasClass(e, "inner")) {
-                    e.innerHTML = labelForToggleButton(arg);
-                }
-            };
-        }
-
-        function implHider(addOrRemove, fullHide) {
-            return function(n) {
-                var shouldHide =
-                    fullHide ||
-                    hasClass(n, "method") ||
-                    hasClass(n, "associatedconstant");
-                if (shouldHide || hasClass(n, "type")) {
-                    if (shouldHide) {
-                        if (addOrRemove) {
-                            addClass(n, "hidden-by-impl-hider");
-                        } else {
-                            removeClass(n, "hidden-by-impl-hider");
-                        }
-                    }
-                    var ns = n.nextElementSibling;
-                    while (ns && (hasClass(ns, "docblock") || hasClass(ns, "item-info"))) {
-                        if (addOrRemove) {
-                            addClass(ns, "hidden-by-impl-hider");
-                        } else {
-                            removeClass(ns, "hidden-by-impl-hider");
-                        }
-                        ns = ns.nextElementSibling;
-                    }
-                }
-            };
-        }
-
-        var relatedDoc;
-        var action = mode;
-        if (!hasClass(toggle.parentNode, "impl")) {
-            relatedDoc = toggle.parentNode.nextElementSibling;
-            if (hasClass(relatedDoc, "item-info")) {
-                relatedDoc = relatedDoc.nextElementSibling;
-            }
-            if (hasClass(relatedDoc, "docblock")) {
-                if (mode === "toggle") {
-                    if (hasClass(relatedDoc, "hidden-by-usual-hider")) {
-                        action = "show";
-                    } else {
-                        action = "hide";
-                    }
-                }
-                if (action === "hide") {
-                    addClass(relatedDoc, "hidden-by-usual-hider");
-                    onEachLazy(toggle.childNodes, adjustToggle(true));
-                    addClass(toggle.parentNode, "collapsed");
-                } else if (action === "show") {
-                    removeClass(relatedDoc, "hidden-by-usual-hider");
-                    removeClass(toggle.parentNode, "collapsed");
-                    onEachLazy(toggle.childNodes, adjustToggle(false));
-                }
-            }
-        } else {
-            // we are collapsing the impl block(s).
-
-            var parentElem = toggle.parentNode;
-            relatedDoc = parentElem;
-            var docblock = relatedDoc.nextElementSibling;
-
-            while (!hasClass(relatedDoc, "impl-items")) {
-                relatedDoc = relatedDoc.nextElementSibling;
-            }
-
-            if (!relatedDoc && !hasClass(docblock, "docblock")) {
-                return;
-            }
-
-            // Hide all functions, but not associated types/consts.
-
-            if (mode === "toggle") {
-                if (hasClass(relatedDoc, "fns-now-collapsed") ||
-                    hasClass(docblock, "hidden-by-impl-hider")) {
-                    action = "show";
-                } else {
-                    action = "hide";
-                }
-            }
-
-            var dontApplyBlockRule = toggle.parentNode.parentNode.id !== "main";
-            if (action === "show") {
-                removeClass(relatedDoc, "fns-now-collapsed");
-                // Stability/deprecation/portability information is never hidden.
-                if (!hasClass(docblock, "item-info")) {
-                    removeClass(docblock, "hidden-by-usual-hider");
-                }
-                onEachLazy(toggle.childNodes, adjustToggle(false, dontApplyBlockRule));
-                onEachLazy(relatedDoc.childNodes, implHider(false, dontApplyBlockRule));
-            } else if (action === "hide") {
-                addClass(relatedDoc, "fns-now-collapsed");
-                // Stability/deprecation/portability information should be shown even when detailed
-                // info is hidden.
-                if (!hasClass(docblock, "item-info")) {
-                    addClass(docblock, "hidden-by-usual-hider");
-                }
-                onEachLazy(toggle.childNodes, adjustToggle(true, dontApplyBlockRule));
-                onEachLazy(relatedDoc.childNodes, implHider(true, dontApplyBlockRule));
-            }
-        }
-    }
-
-    function collapseNonInherent(e) {
-        // inherent impl ids are like "impl" or impl-<number>'.
-        // they will never be hidden by default.
-        var n = e.parentElement;
-        if (n.id.match(/^impl(?:-\d+)?$/) === null) {
-            // Automatically minimize all non-inherent impls
-            if (hasClass(n, "impl")) {
-                collapseDocs(e, "hide");
-            }
-        }
-    }
-
     function insertAfter(newNode, referenceNode) {
         referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);
     }
@@ -910,20 +778,6 @@ function hideThemeButtonState() {
         var hideImplementors = getSettingValue("auto-collapse-implementors") !== "false";
         var hideLargeItemContents = getSettingValue("auto-hide-large-items") !== "false";
 
-        var impl_list = document.getElementById("trait-implementations-list");
-        if (impl_list !== null) {
-            onEachLazy(impl_list.getElementsByClassName("rustdoc-toggle"), function(e) {
-                collapseNonInherent(e);
-            });
-        }
-
-        var blanket_list = document.getElementById("blanket-implementations-list");
-        if (blanket_list !== null) {
-            onEachLazy(blanket_list.getElementsByClassName("rustdoc-toggle"), function(e) {
-                collapseNonInherent(e);
-            });
-        }
-
         onEachLazy(document.getElementsByTagName("details"), function (e) {
             var showLargeItem = !hideLargeItemContents && hasClass(e, "type-contents-toggle");
             var showImplementor = !hideImplementors && hasClass(e, "implementors-toggle");
@@ -936,18 +790,6 @@ function hideThemeButtonState() {
 
         });
 
-        var currentType = document.getElementsByClassName("type-decl")[0];
-        if (currentType) {
-            currentType = currentType.getElementsByClassName("rust")[0];
-            if (currentType) {
-                onEachLazy(currentType.classList, function(item) {
-                    if (item !== "main") {
-                        return true;
-                    }
-                });
-            }
-        }
-
         var pageId = getPageId();
         if (pageId !== null) {
             expandSection(pageId);