Function breakpoint 

pub fn breakpoint()

🔬This is a nightly-only experimental API. (breakpoint #133724)

Compiles to a target-specific software breakpoint instruction or equivalent.

This will typically abort the program. It may result in a core dump, and/or the system logging debug information. Additional target-specific capabilities may be possible depending on debuggers or other tooling; in particular, a debugger may be able to resume execution.

If possible, this will produce an instruction sequence that allows a debugger to resume after the breakpoint, rather than resuming at the breakpoint; however, the exact behavior is target-specific and debugger-specific, and not guaranteed.

If the target platform does not have any kind of debug breakpoint instruction, this may compile to a trapping instruction (e.g. an undefined instruction) instead, or to some other form of target-specific abort that may or may not support convenient resumption.

The precise behavior is not guaranteed, it depends on the architecture and operating system. Not all architectures guarantee that a breakpoint instruction interrupts execution in the absence of a debugger, and not all operating systems and execution environments guarantee that such an interrupt aborts the current process.

The precise instruction is guaranteed only on the following targets:

• On x86 targets, this produces an int3 instruction.
• On aarch64 targets, this produces a brk #0xf000 instruction.