Rollup merge of #89538 - notriddle:notriddle/arrow-highlight, r=GuillaumeGomez

Make rustdoc not highlight `->` and `=>` as operators

It was marking them up as `<span class="op">=</span><span class="op">&gt;</span>`,
which is bloaty and wrong (at least, I think `<=` and `=>` should probably be different colors, since they're so different and yet made from the same symbols).

Before:

![image](https://user-images.githubusercontent.com/1593513/135939748-f49b0f9e-6a7d-4d65-935a-e31cdf688a81.png)

After:

![image](https://user-images.githubusercontent.com/1593513/135940063-5ef1f6b1-7e03-4227-b46b-572b063aba05.png)

1 files changed, 6 insertions, 12 deletions

diff --git a/src/test/rustdoc/macro_rules-matchers.rs b/src/test/rustdoc/macro_rules-matchers.rs
index 5f8340e7312..efc3b21e6da 100644
--- a/src/test/rustdoc/macro_rules-matchers.rs
+++ b/src/test/rustdoc/macro_rules-matchers.rs
@@ -6,37 +6,31 @@
 // @has 'foo/macro.todo.html'
 // @has - '//span[@class="macro"]' 'macro_rules!'
 // @has - '//span[@class="ident"]' 'todo'
-// Note: count = 2 * ('=' + '>') + '+' = 2 * (1 + 1) + 1 = 5
-// @count - '//pre[@class="rust macro"]//span[@class="op"]' 5
+// Note: the only op is the `+`
+// @count - '//pre[@class="rust macro"]//span[@class="op"]' 1
 
-// @has - '{ ()'
-// @has - '//span[@class="op"]' '='
-// @has - '//span[@class="op"]' '>'
-// @has - '{ ... };'
-
-// @has - '($('
+// @has - '{ () => { ... }; ($('
 // @has - '//span[@class="macro-nonterminal"]' '$'
 // @has - '//span[@class="macro-nonterminal"]' 'arg'
 // @has - ':'
 // @has - '//span[@class="ident"]' 'tt'
 // @has - '),'
 // @has - '//span[@class="op"]' '+'
-// @has - ')'
+// @has - ') => { ... }; }'
 pub use std::todo;
 
 mod mod1 {
     // @has 'foo/macro.macro1.html'
     // @has - 'macro_rules!'
     // @has - 'macro1'
-    // @has - '{ ()'
-    // @has - '($('
+    // @has - '{ () => { ... }; ($('
     // @has - '//span[@class="macro-nonterminal"]' '$'
     // @has - '//span[@class="macro-nonterminal"]' 'arg'
     // @has - ':'
     // @has - 'expr'
     // @has - '),'
     // @has - '+'
-    // @has - ')'
+    // @has - ') => { ... }; }'
     #[macro_export]
     macro_rules! macro1 {
         () => {};