Redirection type of a redirecting factory can be deferred

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index 6cc8e5421676438b17b07fdde16c095f27fbaeca..58459e093fa6274058d5afb8eaef66fd1c99ede3 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -3573,7 +3573,7 @@ void Parser::ParseMethodOrConstructor(ClassDesc* members, MemberDesc* method) {
         (LookaheadToken(3) == Token::kPERIOD);
     const AbstractType& type = AbstractType::Handle(Z,
         ParseType(ClassFinalizer::kResolveTypeParameters,
-                  false,  // Deferred types not allowed.
+                  true,
                   consume_unresolved_prefix));
     if (!type.IsMalformed() && type.IsTypeParameter()) {
       // Replace the type with a malformed type and compile a throw when called.
@@ -12019,13 +12019,16 @@ RawAbstractType* Parser::ParseType(
       // If deferred prefixes are allowed but it is not yet loaded,
       // remember that this function depends on the prefix.
       if (allow_deferred_type && !prefix.is_loaded()) {
-        ASSERT(parsed_function() != NULL);
-        parsed_function()->AddDeferredPrefix(prefix);
+        if (parsed_function() != NULL) {
+          parsed_function()->AddDeferredPrefix(prefix);
+        }
       }
-      // If the deferred prefixes are not allowed, or if the prefix
-      // is not yet loaded, return a malformed type. Otherwise, handle
-      // resolution below, as needed.
-      if (!prefix.is_loaded() || !allow_deferred_type) {
+      // If the deferred prefixes are not allowed, or if the prefix is not yet
+      // loaded when finalization is requested, return a malformed type.
+      // Otherwise, handle resolution below, as needed.
+      if (!allow_deferred_type ||
+          (!prefix.is_loaded()
+              && (finalization > ClassFinalizer::kResolveTypeParameters))) {
         ParseTypeArguments(ClassFinalizer::kIgnore);
         return ClassFinalizer::NewFinalizedMalformedType(
             Error::Handle(Z),  // No previous error.
@@ -12702,6 +12705,28 @@ AstNode* Parser::ParseNewOperator(Token::Kind op_kind) {
               String::Handle(Z, redirect_type.UserVisibleName()).ToCString());
         }
       }
+      if (!redirect_type.HasResolvedTypeClass()) {
+        // If the redirection type is unresolved, we convert the allocation
+        // into throwing a type error.
+        const UnresolvedClass& cls =
+            UnresolvedClass::Handle(Z, redirect_type.unresolved_class());
+        const LibraryPrefix& prefix =
+            LibraryPrefix::Handle(Z, cls.library_prefix());
+        if (!prefix.IsNull() && !prefix.is_loaded()) {
+          // If the redirection type is unresolved because it refers to
+          // an unloaded deferred prefix, mark this function as depending
+          // on the library prefix. It will then get invalidated when the
+          // prefix is loaded.
+          parsed_function()->AddDeferredPrefix(prefix);
+        }
+        redirect_type = ClassFinalizer::NewFinalizedMalformedType(
+            Error::Handle(Z),
+            script_,
+            call_pos,
+            "redirection type '%s' is not loaded",
+            String::Handle(Z, redirect_type.UserVisibleName()).ToCString());
+      }
+
       if (redirect_type.IsMalformedOrMalbounded()) {
         if (is_const) {
           ReportError(Error::Handle(Z, redirect_type.error()));