fix: Highlight unresolved derives as being unresolved

crates/hir/src/semantics.rs

@@ -538,8 +538,8 @@ impl<'db> SemanticsImpl<'db> {
     }
 
     fn expand_derive_as_pseudo_attr_macro(&self, attr: &ast::Attr) -> Option<SyntaxNode> {
-        let src = self.wrap_node_infile(attr.clone());
         let adt = attr.syntax().parent().and_then(ast::Adt::cast)?;
+        let src = self.wrap_node_infile(attr.clone());
         let call_id = self.with_ctx(|ctx| {
             ctx.attr_to_derive_macro_call(src.with_value(&adt), src).map(|(_, it, _)| it)
         })?;

crates/ide/src/syntax_highlighting/highlight.rs

@@ -217,7 +217,9 @@ fn highlight_name_ref(
         // to anything when used.
         // We can fix this for derive attributes since derive helpers are recorded, but not for
         // general attributes.
-        None if name_ref.syntax().ancestors().any(|it| it.kind() == ATTR) => {
+        None if name_ref.syntax().ancestors().any(|it| it.kind() == ATTR)
+            && !sema.hir_file_for(name_ref.syntax()).is_derive_attr_pseudo_expansion(sema.db) =>
+        {
             return HlTag::Symbol(SymbolKind::Attribute).into();
         }
         None => return HlTag::UnresolvedReference.into(),

crates/ide/src/syntax_highlighting/test_data/highlight_attributes.html

@@ -53,6 +53,6 @@
 <span class="comment">// This is another normal comment</span>
 <span class="comment documentation">/// This is another doc comment</span>
 <span class="comment">// This is another normal comment</span>
-<span class="attribute_bracket attribute">#</span><span class="attribute_bracket attribute">[</span><span class="attribute attribute default_library library">derive</span><span class="parenthesis attribute">(</span><span class="derive attribute default_library library">Copy</span><span class="parenthesis attribute">)</span><span class="attribute_bracket attribute">]</span>
+<span class="attribute_bracket attribute">#</span><span class="attribute_bracket attribute">[</span><span class="attribute attribute default_library library">derive</span><span class="parenthesis attribute">(</span><span class="derive attribute default_library library">Copy</span><span class="comma attribute">,</span> <span class="unresolved_reference attribute">Unresolved</span><span class="parenthesis attribute">)</span><span class="attribute_bracket attribute">]</span>
 <span class="comment">// The reason for these being here is to test AttrIds</span>
 <span class="keyword">struct</span> <span class="struct declaration">Foo</span><span class="semicolon">;</span></code></pre>

crates/ide/src/syntax_highlighting/tests.rs

@@ -34,7 +34,7 @@ fn attributes() {
 // This is another normal comment
 /// This is another doc comment
 // This is another normal comment
-#[derive(Copy)]
+#[derive(Copy, Unresolved)]
 // The reason for these being here is to test AttrIds
 struct Foo;
 "#,