Highlight the name in macro declarations

Author: matthewjasper

crates/ra_ide/src/snapshots/highlight_strings.html

@@ -27,13 +27,13 @@
 .keyword.unsafe     { color: #BC8383; font-weight: bold; }
 .control            { font-style: italic; }
 </style>
-<pre><code><span class="macro">macro_rules!</span> println {
+<pre><code><span class="macro">macro_rules!</span> <span class="macro declaration">println</span> {
     ($($arg:tt)*) =&gt; ({
         $<span class="keyword">crate</span>::io::_print($<span class="keyword">crate</span>::format_args_nl!($($arg)*));
     })
 }
 #[rustc_builtin_macro]
-<span class="macro">macro_rules!</span> format_args_nl {
+<span class="macro">macro_rules!</span> <span class="macro declaration">format_args_nl</span> {
     ($fmt:expr) =&gt; {{ <span class="comment">/* compiler built-in */</span> }};
     ($fmt:expr, $($args:tt)*) =&gt; {{ <span class="comment">/* compiler built-in */</span> }};
 }

crates/ra_ide/src/snapshots/highlighting.html

@@ -33,11 +33,13 @@
     <span class="keyword">pub</span> <span class="field declaration">y</span>: <span class="builtin_type">i32</span>,
 }
 
+<span class="keyword">static</span> <span class="keyword">mut</span> <span class="static declaration mutable">STATIC_MUT</span>: <span class="builtin_type">i32</span> = <span class="numeric_literal">0</span>;
+
 <span class="keyword">fn</span> <span class="function declaration">foo</span>&lt;<span class="lifetime declaration">'a</span>, <span class="type_param declaration">T</span>&gt;() -&gt; <span class="type_param">T</span> {
     <span class="function">foo</span>::&lt;<span class="lifetime">'a</span>, <span class="builtin_type">i32</span>&gt;()
 }
 
-<span class="macro">macro_rules!</span> def_fn {
+<span class="macro">macro_rules!</span> <span class="macro declaration">def_fn</span> {
     ($($tt:tt)*) =&gt; {$($tt)*}
 }
 

crates/ra_ide/src/syntax_highlighting.rs

@@ -167,6 +167,19 @@ pub(crate) fn highlight(
                         binding_hash: None,
                     });
                 }
+                if let Some(name) = mc.is_macro_rules() {
+                    if let Some((highlight, binding_hash)) = highlight_element(
+                        &sema,
+                        &mut bindings_shadow_count,
+                        name.syntax().clone().into(),
+                    ) {
+                        stack.add(HighlightedRange {
+                            range: name.syntax().text_range(),
+                            highlight,
+                            binding_hash,
+                        });
+                    }
+                }
                 continue;
             }
             WalkEvent::Leave(Some(mc)) => {