Panics in Goroutines

Output, with file paths and addresses trimmed:

panic: assignment to entry in nil map

goroutine 7 [running]:
main.main.func2()
	.../main.go:17
created by main.main in goroutine 1
	.../main.go:15
exit status 2

The author expected the deferred recover in main to catch any panic. It caught nothing. Neither main recovered: nor main finished was printed, and the process ended with exit status 2. The goroutine number in the report, 7 here, can change from one run to the next, even on the same machine.

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