#[starknet::contract]
mod Echo {
#[storage]
struct Storage {
balance: felt252,
}
#[constructor]
fn constructor(ref self: ContractState, initial_balance: felt252) {
//panic_with_felt252('panic');
self.balance.write(initial_balance);
}
#[external(v0)]
fn echo(ref self: ContractState, value: felt252) -> felt252 {
value
}
}