Conditional compilation for field attributes does not work

[egormanga]

When I do:

#[table(name=test)]
struct Test {
	#[cfg_attr(feature(x), unique)]
	x: i32,
}

I get the same result both without and with the x feature enabled.

cargo expand seems to show only #[unique] come and go, while manually setting this attribute results in a bunch of expected code (UniqueColumn, IndexDesc and friends) generated.

I assume the issue is within the derive macro for SpacetimeType, but don't know where to look specifically.

[egormanga]

Per https://stackoverflow.com/q/79385727, there is indeed a cfg-expr crate for this purpose.

[egormanga]

• There's also a similar Does not work with cfg_attr elastio/bon#68.