implements does not allow for imported interfaces

[pcaversaccio]

Version Information

• vyper Version (output of vyper --version): 0.3.11+commit.c6b29c7f
• OS: linux
• Python Version (output of python --version): 3.11.3

What's your issue about?

Related comment #3729 (review). Using the singleton modules with ownership hierarchy design for the PoC:

# mod3.vy

# Assume a folder `interfaces` at root directory with a file `IAccessControl.vy`
import interfaces.IAccessControl as IAccessControl

# mod2.vy

import mod3

# mod1.vy

import mod2 as acl

implements: acl.mod3.IAccessControl

@deploy
def __init__():
    pass

This will throw with:

vyper.exceptions.InvalidType: 'acl.mod3.IAccessControl' is not a type!

How can it be fixed?

Allow expressions of:

implements: lib.InterfaceDefinition