Color for as a regular keyword when it's part of impl _ for _

Author: georgewfraser

crates/ra_ide/src/snapshots/highlighting.html

@@ -33,6 +33,16 @@
     <span class="keyword">pub</span> <span class="field declaration">y</span>: <span class="builtin_type">i32</span>,
 }
 
+<span class="keyword">trait</span> <span class="trait declaration">Bar</span> {
+    <span class="keyword">fn</span> <span class="function declaration">bar</span>(&<span class="keyword">self</span>) -&gt; <span class="builtin_type">i32</span>;
+}
+
+<span class="keyword">impl</span> <span class="trait">Bar</span> <span class="keyword">for</span> <span class="struct">Foo</span> {
+    <span class="keyword">fn</span> <span class="function declaration">bar</span>(&<span class="keyword">self</span>) -&gt; <span class="builtin_type">i32</span> {
+        <span class="keyword">self</span>.<span class="field">x</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> {

crates/ra_ide/src/syntax_highlighting.rs

@@ -403,13 +403,13 @@ fn highlight_element(
                 T![break]
                 | T![continue]
                 | T![else]
-                | T![for]
                 | T![if]
                 | T![loop]
                 | T![match]
                 | T![return]
                 | T![while]
                 | T![in] => h | HighlightModifier::ControlFlow,
+                T![for] if !is_child_of_impl(element) => h | HighlightModifier::ControlFlow,
                 T![unsafe] => h | HighlightModifier::Unsafe,
                 _ => h,
             }
@@ -433,6 +433,13 @@ fn highlight_element(
     }
 }
 
+fn is_child_of_impl(element: SyntaxElement) -> bool {
+    match element.parent() {
+        Some(e) => e.kind() == IMPL_DEF,
+        _ => false,
+    }
+}
+
 fn highlight_name(db: &RootDatabase, def: Definition) -> Highlight {
     match def {
         Definition::Macro(_) => HighlightTag::Macro,

crates/ra_ide/src/syntax_highlighting/tests.rs

@@ -17,6 +17,16 @@ struct Foo {
     pub y: i32,
 }
 
+trait Bar {
+    fn bar(&self) -> i32;
+}
+
+impl Bar for Foo {
+    fn bar(&self) -> i32 {
+        self.x
+    }
+}
+
 static mut STATIC_MUT: i32 = 0;
 
 fn foo<'a, T>() -> T {