I get stacktraces from `panic()` - is this not what you're after?

    goroutine 1 [running]:
    main.b()
        /home/rjp/git/godiggy/test.go:8 +0x64
    main.a()
        /home/rjp/git/godiggy/test.go:13 +0x9b
    main.main()
        /home/rjp/git/godiggy/test.go:18 +0x9b
    exit status 2