Make portability part of the summary.

That means it will be visible under "Implementors" on trait pages, and
under "Implementations" on struct/enum pages, even when all methods are
collapsed.

Switch to a float layout for rightside elements.

src/librustdoc/html/render/mod.rs

@@ -1552,6 +1552,7 @@ fn render_impl(
             w,
             cx,
             i,
+            parent,
             outer_version,
             outer_const_version,
             show_def_docs,
@@ -1562,11 +1563,6 @@ fn render_impl(
         if toggled {
             write!(w, "</summary>")
         }
-        if trait_.is_some() {
-            if let Some(portability) = portability(&i.impl_item, Some(parent)) {
-                write!(w, "<div class=\"item-info\">{}</div>", portability);
-            }
-        }
 
         if let Some(ref dox) = cx.shared.maybe_collapsed_doc_value(&i.impl_item) {
             let mut ids = cx.id_map.borrow_mut();
@@ -1598,6 +1594,7 @@ pub(crate) fn render_impl_summary(
     w: &mut Buffer,
     cx: &Context<'_>,
     i: &Impl,
+    parent: &clean::Item,
     outer_version: Option<&str>,
     outer_const_version: Option<&str>,
     show_def_docs: bool,
@@ -1652,6 +1649,7 @@ pub(crate) fn render_impl_summary(
         );
     }
     write!(w, "<a href=\"#{}\" class=\"anchor\"></a>", id);
+    write!(w, "<div class=\"rightside\">");
     render_stability_since_raw(
         w,
         i.impl_item.stable_since(tcx).as_deref(),
@@ -1660,6 +1658,15 @@ pub(crate) fn render_impl_summary(
         outer_const_version,
     );
     write_srclink(cx, &i.impl_item, w);
+    w.write_str("</div>"); // end of "rightside"
+
+    let is_trait = i.inner_impl().trait_.is_some();
+    if is_trait {
+        if let Some(portability) = portability(&i.impl_item, Some(parent)) {
+            write!(w, "<div class=\"item-info\">{}</div>", portability);
+        }
+    }
+
     w.write_str("</div>");
 }
 

src/librustdoc/html/render/print_item.rs

@@ -585,11 +585,14 @@ fn item_trait(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, t: &clean::Tra
         if toggled {
             write!(w, "<details class=\"rustdoc-toggle\" open><summary>");
         }
-        write!(w, "<div id=\"{}\" class=\"method has-srclink\"><code>", id);
-        render_assoc_item(w, m, AssocItemLink::Anchor(Some(&id)), ItemType::Impl, cx);
-        w.write_str("</code>");
+        write!(w, "<div id=\"{}\" class=\"method has-srclink\">", id);
+        write!(w, "<div class=\"rightside\">");
         render_stability_since(w, m, t, cx.tcx());
         write_srclink(cx, m, w);
+        write!(w, "</div>");
+        write!(w, "<code>");
+        render_assoc_item(w, m, AssocItemLink::Anchor(Some(&id)), ItemType::Impl, cx);
+        w.write_str("</code>");
         w.write_str("</div>");
         if toggled {
             write!(w, "</summary>");
@@ -697,6 +700,7 @@ fn item_trait(w: &mut Buffer, cx: &Context<'_>, it: &clean::Item, t: &clean::Tra
                     w,
                     cx,
                     &implementor,
+                    it,
                     outer_version.as_deref(),
                     outer_const_version.as_deref(),
                     false,
@@ -1305,7 +1309,7 @@ fn render_implementor(
     implementor_dups: &FxHashMap<Symbol, (DefId, bool)>,
     aliases: &[String],
 ) {
-    // If there's already another implementor that has the same abbridged name, use the
+    // If there's already another implementor that has the same abridged name, use the
     // full path, for example in `std::iter::ExactSizeIterator`
     let use_absolute = match implementor.inner_impl().for_ {
         clean::ResolvedPath { ref path, is_generic: false, .. }
@@ -1321,6 +1325,7 @@ fn render_implementor(
         w,
         cx,
         implementor,
+        trait_,
         outer_version.as_deref(),
         outer_const_version.as_deref(),
         false,

src/librustdoc/html/static/rustdoc.css

@@ -581,7 +581,6 @@ nav.sub {
 .content .item-info {
 	position: relative;
 	margin-left: 33px;
-	margin-top: -13px;
 }
 
 .sub-variant > div > .item-info {
@@ -852,12 +851,12 @@ body.blur > :not(#help) {
 }
 
 .stab {
-	display: table;
 	border-width: 1px;
 	border-style: solid;
 	padding: 3px;
 	margin-bottom: 5px;
 	font-size: 90%;
+	font-weight: normal;
 }
 .stab p {
 	display: inline;
@@ -906,26 +905,22 @@ body.blur > :not(#help) {
 }
 
 .impl-items .since, .impl .since, .methods .since {
-	flex-grow: 0;
 	padding-left: 12px;
 	padding-right: 2px;
 	position: initial;
 }
 
 .impl-items .srclink, .impl .srclink, .methods .srclink {
-	flex-grow: 0;
 	/* Override header settings otherwise it's too bold */
 	font-size: 17px;
 	font-weight: normal;
 }
 
-.impl-items code, .impl code, .methods code {
-	flex-grow: 1;
+.rightside {
+	float: right;
 }
 
 .has-srclink {
-	display: flex;
-	flex-basis: 100%;
 	font-size: 16px;
 	margin-bottom: 12px;
 	/* Push the src link out to the right edge consistently */
@@ -986,7 +981,6 @@ a.test-arrow:hover{
 }
 
 .since + .srclink {
-	display: table-cell;
 	padding-left: 10px;
 }
 

src/test/rustdoc/src-links-auto-impls.rs

@@ -2,11 +2,11 @@
 
 // @has foo/struct.Unsized.html
 // @has - '//div[@id="impl-Sized"]/code' 'impl !Sized for Unsized'
-// @!has - '//div[@id="impl-Sized"]/a[@class="srclink"]' '[src]'
+// @!has - '//div[@id="impl-Sized"]//a[@class="srclink"]' '[src]'
 // @has - '//div[@id="impl-Sync"]/code' 'impl Sync for Unsized'
-// @!has - '//div[@id="impl-Sync"]/a[@class="srclink"]' '[src]'
+// @!has - '//div[@id="impl-Sync"]//a[@class="srclink"]' '[src]'
 // @has - '//div[@id="impl-Any"]/code' 'impl<T> Any for T'
-// @has - '//div[@id="impl-Any"]/a[@class="srclink"]' '[src]'
+// @has - '//div[@id="impl-Any"]//a[@class="srclink"]' '[src]'
 pub struct Unsized {
     data: [u8],
 }