E029: incoming-messages-duplicate-opcode

Metadata

• Code: E029
• Rule: incoming-messages-duplicate-opcode
• Status: Stable since v0.0.1
• Quick fix: not available

What it does

Checks contract header field incomingMessages for duplicate message opcodes.

Why is this bad?

If two incoming message variants share the same opcode, message decoding is ambiguous.

Example

struct (0x1000) MsgA {}
struct (0x1000) MsgB {}
E029: incomingMessages contains message variants with duplicate opcode

contract Wallet {
    incomingMessages: MsgA | MsgB,
}

Use instead:

struct (0x1000) MsgA {}
struct (0x1001) MsgB {}