There's quite a few panic implementations now, so I think it'd be useful to list them here. I'm not sure where exactly they should be put though, because some of them are platform-independent while others aren't. Personally I think these belong in their own section.

List of crates:

• panic-halt: Halts the processor on panics
• panic-abort: Causes an abort on panics (nightly-only)
• panic-ramdump: Writes the panic message into the beginning of RAM and enters an infinite loop; the message can be extracted by attaching a debugger (Cortex-M only)
• panic-semihosting: Prints the panic message via semihosting to an attached debugger (Cortex-M only)
• panic-itm: Prints the panic through the chip's ITM to a debugger attached to the SWO pin (Cortex-M with ITM only)