protected function ensureCanDefine(Stmt $stmt, $scopeType = self::CLASS_TYPE)
    {
        $name = $this->getFullyQualifiedName($stmt->name);

        // check for name collisions
        $errorType = null;
        if ($this->classExists($name)) {
            $errorType = self::CLASS_TYPE;
        } elseif ($this->interfaceExists($name)) {
            $errorType = self::INTERFACE_TYPE;
        } elseif ($this->traitExists($name)) {
            $errorType = self::TRAIT_TYPE;
        }

        if ($errorType !== null) {
            throw $this->createError(\sprintf('%s named %s already exists', \ucfirst($errorType), $name), $stmt);
        }

        // Store creation for the rest of this code snippet so we can find local
        // issue too
        $this->currentScope[\strtolower($name)] = $scopeType;
    }