If the attached module Trampoline.hs is compiled with no optimizations it works:

$ ghc --make Trampoline.hs   
[1 of 1] Compiling Main             ( Trampoline.hs, Trampoline.o )
Linking Trampoline ...
$ ./Trampoline 
...
((5,2),(1,2,6))
$ 

With optimizations on, it hangs:

$ ghc --make Trampoline.hs -O
[1 of 1] Compiling Main             ( Trampoline.hs, Trampoline.o )
Linking Trampoline ...
$ ./Trampoline 
bounce start
bounce end
liftOut
inject suspend
Trampoline: <<loop>>

That doesn't seem right. Oh, GHCi runs it with no problem as well.