Function catch_oom 

pub fn catch_oom<F: FnOnce() -> R + UnwindSafe, R>(
    f: F,
) -> Result<R, AllocError>

Invokes a closure, capturing the out-of-memory panic if one occurs.

This function will return Ok with the closure’s result if the closure does not panic, and will return AllocError if allocation error occurs. The process will abort if other panics occur.