id,summary,reporter,owner,description,type,status,priority,milestone,component,version,resolution,keywords,cc,os,architecture,failure,difficulty,testcase,blockedby,blocking,related
3591,A working program reports <<loop>> when compiled with -O,blamario,igloo,"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.

",merge,closed,normal,6.12.1,Compiler,6.10.4,fixed,,,Linux,x86_64 (amd64),None/Unknown,Unknown,simplCore/should_run/T3591,,,