Pimple\Container was used as the keyword for the top use, but this file can't find in my local directory
because In my editor, the Pimple is displayed in red in the use-Pimple\Container section, and is "Undefined namespace is not Referenced"
Nevertheless, the code on the screen does not produce an error and acts as if it were a file.
My guess is that It's an external library but no matter how you look at it, it makes me curious
Is this normal? Or What have I missed?