Return

use fuel_types::ContractId;
pub struct Return {
    pub contract_id: ContractId,
    pub val: u64,
    pub pc: u64,
    pub is: u64,
}

• A Return receipt is generated when returning a non-reference type in a Sway contract.
  • Specifically bool, u8, u16, u32, and u64.
• The val field includes the value being returned.
• Read more about Log in the Fuel protocol ABI spec

You can handle functions that produce a Return receipt type by adding a parameter with the type abi::Return.

fn handle_return(data: abi::Return) {
  // handle the returned data
}