blockhash() allowed in pure functions #3141
Description
Version Information
- vyper Version (output of
vyper --version): 0.3.7+commit.6020b8bb - OS: OSX
- Python Version (output of
python --version): 3.8.0
What's your issue about?
The usage of the built-in function blockhash() is currently allowed in pure functions although it is reading the blockchain state.
For example, the following contract compiles successfully:
@external
@pure
def foo(x: uint256)-> bytes32:
return blockhash(x)How can it be fixed?
Functions that make use of the blockhash() built-in must be declared as view, nonpayable or payable.