rustdoc: rearrange HTML in primitive reference links

This patch avoids hard-to-click single character links by making
the generic part of the link:

Before: <a href="#">&</a>T

After: <a href="#">&T</a>

src/librustdoc/html/format.rs

@@ -1064,14 +1064,8 @@ fn fmt_type<'cx>(
                     fmt_type(ty, f, use_absolute, cx)?;
                     write!(f, ")")
                 }
-                clean::Generic(..) => {
-                    primitive_link(
-                        f,
-                        PrimitiveType::Reference,
-                        &format!("{}{}{}", amp, lt, m),
-                        cx,
-                    )?;
-                    fmt_type(ty, f, use_absolute, cx)
+                clean::Generic(name) => {
+                    primitive_link(f, PrimitiveType::Reference, &format!("{amp}{lt}{m}{name}"), cx)
                 }
                 _ => {
                     write!(f, "{}{}{}", amp, lt, m)?;

tests/rustdoc/whitespace-after-where-clause.enum.html

@@ -1,4 +1,4 @@
 <div class="item-decl"><pre class="rust"><code>pub enum Cow&lt;'a, B&gt;<span class="where fmt-newline">where<br />&#160;&#160;&#160;&#160;B: <a class="trait" href="trait.ToOwned.html" title="trait foo::ToOwned">ToOwned</a>&lt;dyn <a class="trait" href="{{channel}}/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>&gt; + ?<a class="trait" href="{{channel}}/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + 'a,</span>{
-    Borrowed(<a class="primitive" href="{{channel}}/std/primitive.reference.html">&amp;'a </a>B),
+    Borrowed(<a class="primitive" href="{{channel}}/std/primitive.reference.html">&amp;'a B</a>),
     Whatever(<a class="primitive" href="{{channel}}/std/primitive.u32.html">u32</a>),
 }</code></pre></div>

tests/rustdoc/whitespace-after-where-clause.enum2.html

@@ -1,4 +1,4 @@
 <div class="item-decl"><pre class="rust"><code>pub enum Cow2&lt;'a, B:&#160;?<a class="trait" href="{{channel}}/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.ToOwned.html" title="trait foo::ToOwned">ToOwned</a>&lt;dyn <a class="trait" href="{{channel}}/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>&gt; + 'a&gt; {
-    Borrowed(<a class="primitive" href="{{channel}}/std/primitive.reference.html">&amp;'a </a>B),
+    Borrowed(<a class="primitive" href="{{channel}}/std/primitive.reference.html">&amp;'a B</a>),
     Whatever(<a class="primitive" href="{{channel}}/std/primitive.u32.html">u32</a>),
 }</code></pre></div>

tests/rustdoc/whitespace-after-where-clause.struct.html

@@ -1,4 +1,4 @@
 <div class="item-decl"><pre class="rust"><code>pub struct Struct&lt;'a, B&gt;<span class="where fmt-newline">where<br />&#160;&#160;&#160;&#160;B: <a class="trait" href="trait.ToOwned.html" title="trait foo::ToOwned">ToOwned</a>&lt;dyn <a class="trait" href="{{channel}}/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>&gt; + ?<a class="trait" href="{{channel}}/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + 'a,</span>{
-    pub a: <a class="primitive" href="{{channel}}/std/primitive.reference.html">&amp;'a </a>B,
+    pub a: <a class="primitive" href="{{channel}}/std/primitive.reference.html">&amp;'a B</a>,
     pub b: <a class="primitive" href="{{channel}}/std/primitive.u32.html">u32</a>,
 }</code></pre></div>

tests/rustdoc/whitespace-after-where-clause.struct2.html

@@ -1,4 +1,4 @@
 <div class="item-decl"><pre class="rust"><code>pub struct Struct2&lt;'a, B:&#160;?<a class="trait" href="{{channel}}/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="trait.ToOwned.html" title="trait foo::ToOwned">ToOwned</a>&lt;dyn <a class="trait" href="{{channel}}/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>&gt; + 'a&gt; {
-    pub a: <a class="primitive" href="{{channel}}/std/primitive.reference.html">&amp;'a </a>B,
+    pub a: <a class="primitive" href="{{channel}}/std/primitive.reference.html">&amp;'a B</a>,
     pub b: <a class="primitive" href="{{channel}}/std/primitive.u32.html">u32</a>,
 }</code></pre></div>