Anchor 0.28.0 IDL Events Do Not Correctly Refer to Account Types

[sol-mocha]

Example IDL Event:

  "events": [
    {
      "name": "InitializeEvent",
      "fields": [
        {
          "name": "state",
          "type": {
            "defined": "State"
          },
          "index": false
        },
        {
          "name": "payer",
          "type": "publicKey",
          "index": false
        }
      ]
    },
    {
      "name": "Initialize2Event",
      "fields": [
        {
          "name": "state",
          "type": {
            "defined": "State2"
          },
          "index": false
        },
        {
          "name": "payer",
          "type": "publicKey",
          "index": false
        }
      ]
    }
  ],

From the following definition:

/// An account containing various fields
#[account]
pub struct State {
	...
}

#[account]
pub struct State2 {
    ...
}

#[event]
pub struct InitializeEvent {
    state: State,
    payer: Pubkey,
}
#[event]
pub struct Initialize2Event {
    state: State2,
    payer: Pubkey,
}

The IDL lists the state and state2 types as defined but these types are actually accounts and don't exist in idl.types. IDL parsers must guess that the types are either in types or accounts, or try with types first and fall-back on accounts if the definition does not exist.

[acheroncrypto]

Yes, this is kind of an edge case that has existed for a while(https://github.com/coral-xyz/anchor/issues/1971).

[acheroncrypto]

Fixed by https://github.com/coral-xyz/anchor/pull/2824.