double panic

> go install github.com/mlowicki/lab && ./bin/lab
Deferred by h
Deferred by g
Deferred by f
panic: boom!
        panic: 2nd explosion!

goroutine 5 [running]:
panic(0xb8480, 0x8201c82d0)
        /usr/local/go/src/runtime/panic.go:481 +0x3e6
main.h.func2()
        /Users/mlowicki/projects/golang/spec/src/github.com/mlowicki/lab/lab.go:25 +0x65
panic(0xb8480, 0x8201c82c0)
        /usr/local/go/src/runtime/panic.go:443 +0x4e9
main.h()
        /Users/mlowicki/projects/golang/spec/src/github.com/mlowicki/lab/lab.go:27 +0xa3
main.g()
        /Users/mlowicki/projects/golang/spec/src/github.com/mlowicki/lab/lab.go:17 +0x35
main.f(0x820214060)
        /Users/mlowicki/projects/golang/spec/src/github.com/mlowicki/lab/lab.go:9 +0x35
created by main.main
        /Users/mlowicki/projects/golang/spec/src/github.com/mlowicki/lab/lab.go:32 +0x53