Created expand_allowed_builtins, updated expand_macro to call this function

Author: ishanjain28

src/tools/rust-analyzer/crates/hir/src/semantics.rs

@@ -315,6 +315,22 @@ impl<'db> SemanticsImpl<'db> {
     pub fn expand(&self, macro_call: &ast::MacroCall) -> Option<SyntaxNode> {
         let sa = self.analyze_no_infer(macro_call.syntax())?;
 
+        let macro_call = InFile::new(sa.file_id, macro_call);
+        let file_id = if let Some(call) =
+            <ast::MacroCall as crate::semantics::ToDef>::to_def(self, macro_call)
+        {
+            call.as_macro_file()
+        } else {
+            sa.expand(self.db, macro_call)?
+        };
+
+        let node = self.parse_or_expand(file_id.into());
+        Some(node)
+    }
+
+    pub fn expand_allowed_builtins(&self, macro_call: &ast::MacroCall) -> Option<SyntaxNode> {
+        let sa = self.analyze_no_infer(macro_call.syntax())?;
+
         let macro_call = InFile::new(sa.file_id, macro_call);
         let file_id = if let Some(call) =
             <ast::MacroCall as crate::semantics::ToDef>::to_def(self, macro_call)

src/tools/rust-analyzer/crates/ide/src/expand_macro.rs

@@ -111,9 +111,10 @@ fn expand_macro_recur(
     macro_call: &ast::Item,
 ) -> Option<SyntaxNode> {
     let expanded = match macro_call {
-        item @ ast::Item::MacroCall(macro_call) => {
-            sema.expand_attr_macro(item).or_else(|| sema.expand(macro_call))?.clone_for_update()
-        }
+        item @ ast::Item::MacroCall(macro_call) => sema
+            .expand_attr_macro(item)
+            .or_else(|| sema.expand_allowed_builtins(macro_call))?
+            .clone_for_update(),
         item => sema.expand_attr_macro(item)?.clone_for_update(),
     };
     expand(sema, expanded)