retry

In std/collections.

elementwise fn retry<F<_> : Iterable<_>, T, U, E>(self: F<T>, operation: T -> Result<U, E>, attempts: Int) : F<Result<U, E>>
elementwise fn retry<F<_> : Iterable<_>, T, U, E>(self: F<T>, operation: T -> Result<U, E>, attempts: Int, when: E -> Bool) : F<Result<U, E>>

Each element through the fallible operation, invoked again while it fails with an error when accepts (every error, without when) and fewer than attempts invocations have run. The result is each element's last result: its success, or its last failure.