protected override TypeExpr[] ResolveBaseTypes (out TypeExpr base_class)
{
TypeExpr[] ifaces = base.ResolveBaseTypes (out base_class);
if (base_class == null) {
if (spec != TypeManager.object_type)
base_type = TypeManager.object_type;
} else {
if (base_type.IsGenericParameter){
Report.Error (689, base_class.Location, "`{0}': Cannot derive from type parameter `{1}'",
GetSignatureForError (), base_type.GetSignatureForError ());
} else if (IsGeneric && base_type.IsAttribute) {
Report.Error (698, base_class.Location,
"A generic type cannot derive from `{0}' because it is an attribute class",
base_class.GetSignatureForError ());
} else if (base_type.IsStatic) {
Report.SymbolRelatedToPreviousError (base_class.Type);
Report.Error (709, Location, "`{0}': Cannot derive from static class `{1}'",
GetSignatureForError (), base_type.GetSignatureForError ());
} else if (base_type.IsSealed) {
Report.SymbolRelatedToPreviousError (base_class.Type);
Report.Error (509, Location, "`{0}': cannot derive from sealed type `{1}'",
GetSignatureForError (), base_type.GetSignatureForError ());
} else if (PartialContainer.IsStatic && base_class.Type != TypeManager.object_type) {
Report.Error (713, Location, "Static class `{0}' cannot derive from type `{1}'. Static classes must derive from object",
GetSignatureForError (), base_class.GetSignatureForError ());
}
if (base_type is BuildinTypeSpec && !(spec is BuildinTypeSpec) &&
(base_type == TypeManager.enum_type || base_type == TypeManager.value_type || base_type == TypeManager.multicast_delegate_type ||
base_type == TypeManager.delegate_type || base_type == TypeManager.array_type)) {
Report.Error (644, Location, "`{0}' cannot derive from special class `{1}'",
GetSignatureForError (), base_type.GetSignatureForError ());
base_type = TypeManager.object_type;
}
if (!IsAccessibleAs (base_type)) {
Report.SymbolRelatedToPreviousError (base_type);
Report.Error (60, Location, "Inconsistent accessibility: base class `{0}' is less accessible than class `{1}'",
base_type.GetSignatureForError (), GetSignatureForError ());
}
}
if (PartialContainer.IsStatic && ifaces != null) {
foreach (TypeExpr t in ifaces)
Report.SymbolRelatedToPreviousError (t.Type);
Report.Error (714, Location, "Static class `{0}' cannot implement interfaces", GetSignatureForError ());
}
return ifaces;
}