src/Container.php
protected function getConcreteFromInterface($interface)
    {
        if (!$this->isAbstractExists($interface)) {
            throw Internal\Exception\ReflectionExceptionFactory::runtime(
                sprintf("%s has no concrete implementation in the class binding stack.", $interface)
            );
        }

        try {
            return $this->getResolvedSingleton($interface);
        } catch (\Exception $e) {
        }

        $concrete = $this->bindings[$interface]['concrete'];

        $object = $concrete instanceof \Closure ? $concrete($this) : $this->build($concrete);

        if ($this->isShared($interface)) {
            $this->markAsResolved($interface, $object, 'singleton');
        } else {
            $this->markAsResolved($interface, $object);
        }

        return $object;
    }
protected function getConcreteFromInterface($interface)
    {
        if (!$this->isAbstractExists($interface)) {
            throw Internal\Exception\ReflectionExceptionFactory::runtime(
                sprintf("%s has no concrete implementation in the class binding stack.", $interface)
            );
        }

        try {
            return $this->getResolvedSingleton($interface);
        } catch (\Exception $e) {
        }

        $concrete = $this->bindings[$interface]['concrete'];

        $object = $concrete instanceof \Closure ? $concrete($this) : $this->build($concrete);

        if ($this->isShared($interface)) {
            $this->markAsResolved($interface, $object, 'singleton');
        } else {
            $this->markAsResolved($interface, $object);
        }

        return $object;
    }
Get concrete implementation from abstract.

@param string $interface The interface name.
@return object