Signals a memory allocation error.

Callers of memory allocation APIs wishing to cease execution in response to an allocation error are encouraged to call this function, rather than directly invoking panic! or similar.

This function is guaranteed to diverge (not return normally with a value), but depending on global configuration, it may either panic (resulting in unwinding or aborting as per configuration for all panics), or abort the process (with no unwinding).

The default behavior is:

• If the binary links against std (typically the case), then print a message to standard error and abort the process. This behavior can be replaced with set_alloc_error_hook and take_alloc_error_hook. Future versions of Rust may panic by default instead.

• If the binary does not link against std (all of its crates are marked #![no_std]), then call panic! with a message. The panic handler applies as to any panic.