Conditional compilation for field attributes does not work

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.

Start at the SpacetimeType derive macro, as suggested in the issue, and compare cargo expand output with the x feature disabled and enabled. Verify that the cfg_attr-controlled unique attribute produces the expected UniqueColumn, IndexDesc, and related generated code when the feature is enabled, while remaining absent otherwise.