Can't have an interface as a constant

[fubuloubu]

Version Information

• vyper Version (output of vyper --version): 0.3.7
• OS: linux
• Python Version (output of python --version): n/a

What's your issue about?

If you try to define an interface constant, it doesn't see it as a literal value

interface Bar:
    def bar(): nonpayable


BAR: constant(Bar) = Bar(0x0000000000000000000000000000000000000000)

  File "~/.pyenv/versions/3.9.13/envs/academy/lib/python3.9/site-packages/ape_vyper/compiler.py", line 236, in compile
    result = vvm.compile_standard(
  File "~/.pyenv/versions/3.9.13/envs/academy/lib/python3.9/site-packages/vvm/main.py", line 188, in compile_standard
    raise VyperError(
vvm.exceptions.VyperError: Value must be a literal
  contract "Foo.vy:5", line 5:21 
       4
  ---> 5 BAR: constant(Bar) = Bar(0x0000000000000000000000000000000000000000)
  ----------------------------^
       6