accounts is borrowed for 'info

[lantianlaoli]

12 | #[program]
   | ^^^^^^^^^-
   | |        |
   | |        `__accounts` dropped here while still borrowed
   | borrowed value does not live long enough
   | lifetime `'info` defined here
   | argument requires that `__accounts` is borrowed for `'info`

I don't why life time error happen when I add 'b on lib.rs

pub fn battle_log<'b: 'info, 'c: 'info, 'info>(
        ctx: Context<'_, 'b, 'c, 'info, BattleLog<'info>>,
        battle_info: BattleInfo,
        warrior_card_collect_mints: Vec<Pubkey>
    ) -> Result<()> {
        battle_log_process(ctx, battle_info, warrior_card_collect_mints)
    }

I want to extract the logic of creating an account into a function, and then it will report an error, asking me to add the relationship between b and info.

The result is written in this way, but it cannot pass the limit of the problem I posted.

[acheroncrypto]

This is due to how internal codegen works. However, there is a draft PR (#3340) to make all lifetimes of Context the same to make it easier for people to work with it.

[lantianlaoli]

Solution:
If you function involved in some params of context.accounts
don't add 'info in the front of params with context. like payer: &'info Signer<'info> .
Right example:

fn process_warrior_cards_usage<'info>(
    warrior_card_usage_data_len: usize,
    warrior_card_usage_ai: &'info AccountInfo<'info>,
    collect_mint: Pubkey,
    attacker: Pubkey,
    program_id: &Pubkey,
    payer: &Signer<'info>,
    rent_lamports: u64,
    system_program: &Program<'info, System>
) -> Result<()> {