Cannot pass a mere 4-byte signature via '_abi_encode'

[hedgar2017]

Version Information

• vyper Version (output of vyper --version): 0.3.2
• OS: linux
• Python Version (output of python --version): 3.10.2

What's your issue about?

Perhaps, there is no way to pass a mere selector. The way like this does not work as well:

METHOD_ID: constant(Bytes[4]) = b"\x12\x34\x56\x78"

@external
@pure
def f0() -> Bytes[100]:
    return _abi_encode(METHOD_ID, ensure_tuple=False)

this does not work either:

@external
@pure 
def f1() -> Bytes[100]:
    return _abi_encode(method_id=METHOD_ID)

[fubuloubu]

For giggles, can you try METHOD_ID: constant(bytes4) = 0x12345678?

[charles-cooper]

meeting notes: _abi_encode must have at least one positional arg. we should document this, and note in the docs that if you just want the 4-byte selector, you can use a constant - e.g. b"\x01\x02\x03\x04" or method_id("foo(uint256)"