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go/doc/next/4-runtime.md

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Runtime

The message printed when a program exits due to an unhandled panic that was recovered and re-raised no longer repeats the text of the panic value.

Previously, a program which panicked with panic("PANIC"), recovered the panic, and then re-panicked with the original value would print:

panic: PANIC [recovered]
  panic: PANIC

This program will now print:

panic: PANIC [recovered, reraised]

On Linux systems with kernel support for anonymous VMA names (CONFIG_ANON_VMA_NAME), the Go runtime will annotate anonymous memory mappings with context about their purpose. e.g., [anon: Go: heap] for heap memory. This can be disabled with the GODEBUG setting decoratemappings=0.