Add eager-expand comment

Author: Veykril

crates/hir-expand/src/builtin_fn_macro.rs

@@ -776,7 +776,10 @@ fn quote_expand(
     _db: &dyn ExpandDatabase,
     _arg_id: MacroCallId,
     _tt: &tt::Subtree,
-    _span: SpanData,
+    span: SpanData,
 ) -> ExpandResult<tt::Subtree> {
-    ExpandResult::only_err(ExpandError::other("quote! is not implemented"))
+    ExpandResult::new(
+        tt::Subtree::empty(tt::DelimSpan { open: span, close: span }),
+        ExpandError::other("quote! is not implemented"),
+    )
 }

crates/hir/src/source_analyzer.rs

@@ -1165,8 +1165,9 @@ fn resolve_hir_path_qualifier(
     (|| {
         let (ty, unresolved) = match path.type_anchor() {
             Some(type_ref) => {
-                let (_, res) = TyLoweringContext::new(db, resolver, resolver.module().into())
-                    .lower_ty_ext(type_ref);
+                let (_, res) =
+                    TyLoweringContext::new_maybe_unowned(db, resolver, resolver.type_owner())
+                        .lower_ty_ext(type_ref);
                 res.map(|ty_ns| (ty_ns, path.segments().first()))
             }
             None => {

crates/proc-macro-srv/src/server/rust_analyzer_span.rs

@@ -143,6 +143,11 @@ impl server::TokenStream for RaSpanServer {
     }
 
     fn expand_expr(&mut self, self_: &Self::TokenStream) -> Result<Self::TokenStream, ()> {
+        // FIXME: requires db, more importantly this requires name resolution so we would need to
+        // eagerly expand this proc-macro, but we can't know that this proc-macro is eager until we
+        // expand it ...
+        // This calls for some kind of marker that a proc-macro wants to access this eager API,
+        // otherwise we need to treat every proc-macro eagerly / or not support this.
         Ok(self_.clone())
     }