Immutables Allowed to Be Used as Default Arguments

[cyberthirst]

Version Information

• vyper Version (output of vyper --version): commit 4b4e188ba83d28b5dd6ff66479e7448e5b925030

Issue description

According to the documentation, the default arguments of a function must
be literals or environment variables, however, immutables are allowed to
be used as default arguments.

The following contract compiles:

x:immutable(uint256)

@deploy
def __init__():
    x = 1

@external
def foo(val:uint256 = x):
    pass

credits: @trocher

[fubuloubu]

this seems kinda useful actually, suggest updating docs?

[charles-cooper]

i'm not sure yet if this is a compiler bug or docs issue, but i'm leaning towards docs issue.

note that this behavior was introduced in #3669, and that this behavior is blocked for pure functions as of #3895 (pure cannot read from runtime code, but view can)