Got __anchor_private_gen_idl_type when implement wormhole

[linuxhjkaru]

From Wormhole Scaffolding, when I build project with anchor 0.29.0.
Then below error shows

1481 | pub struct WrappedMint(anchor_spl::token::Mint);
     | -------------------------- associated item `__anchor_private_gen_idl_type` not found for this struct
     |
     = help: items from traits can only be used if the trait is implemented and in scope
     = note: the following trait defines an item `__anchor_private_gen_idl_type`, perhaps you need to implement it:
             candidate #1: `anchor_lang::IdlBuild`

Based on this PR , seems like I have to implement __anchor_private_gen_idl_type by myself but how can I do it?

[acheroncrypto]

You can add an empty IdlBuild implementation for your type which will make it compile, but the type won't get included in the IDL.

#[cfg(feature = "idl-build")]
impl anchor_lang::IdlBuild for WrappedMint {}

See IdlBuild's documentation.