Vyper: Constants can't be used for the list size

[nrryuya]

Version Information

• vyper Version: 1.0.0b6
• OS: osx
• Python Version : 3.6

What's your issue about?

I got Unknown list type. error when I used constants for the list size.

e.g.

TREE_DEPTH: constant(uint256) = 16

@public
def calcMerkleRoot(_proof: bytes32[TREE_DEPTH]):
    pass

With bytes[TREE_DEPTH] (fixed-size byte arrays) the same error occurs.

I'm not sure this is an error or intended but constants for the list size would be useful.

How can it be fixed?

Cute Animal Picture

[hskang9]

I think the current listType parser in line 329~349 of types.py does not support elif isinstance(item.slice.value, ast.Name):, whereas ast.Num is supported. so the variable jumps into else statement case and shows error 'Unknown list type'. I will see what I can do. I will probably add logic to look up value in ast.Name, check its type, and apply same logic as ast.Num does if its value is an integer.

[jacqueswww]

@nrryuya please test constant fixes have just been merged ;)

[nrryuya]

@jacqueswww
This is fixed! Thank you ;)