impl<T> CustomMsg for Option<T> where T: CustomMsg {}

[taitruong]

Is it possible to add impl<T> CustomMsg for Option<T> where T: CustomMsg {} it here:

cosmwasm/packages/std/src/results/cosmos_msg.rs

Lines 20 to 22 in 11cc041

	pub trait CustomMsg: Serialize + Clone + fmt::Debug + PartialEq + JsonSchema {}
	impl CustomMsg for Empty {}

Because I cannot do this in my contract ofc.

[webmaster128]

Could you explain more about the use case? How should that be implemented?

[taitruong]

In your code you have this:

defined in cosmos_msg.rs:

impl CustomMsg for Empty {}

But this is missing: impl CustomMsg for Option<Empty> {}

Ofc I cannot add it in my contract and get this error:

Since this is missing - it is not possible having CustomMsg for Option<Empty> - it is even not possible having any custom struct for Option<T>.

[taitruong]

@webmaster128 see workaround here: CosmWasm/cw-nfts#156 (comment)