injectFn([$obj, 'publicMethod'])`
* * `$context->injectFn([$this, 'publicMethod'])`
* * `$context->injectFn(\Closure::fromCallable([$this, 'privateMethod']))`
*
* Note: the app container will be queried
*
* @param callable $fn
* @throws ContainerExceptionInterface if at least one of the parameter can't be resolved
* @throws Throwable any error the function invocation might cause
* @return mixed|null the return value of the invoked function, if any
* @since 20.0.0
*/
public function injectFn(callable $fn);
}
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