I'm experimenting with GHC (5.00.1) on RedHat Linux 7.1, it's foreign function interface (using .hsc files) and the SDL graphics library (v1.2). The curious thing is that the following code:
main = sdlInit [sdlVideo[ sdlQuit
can be loaded into GHCi and executed as many times as I like, however, if I then carry on and edit the module containing main, and then perform a reload (:r), I sometimes get an "EVACUATED object entered!" message and GHC crashes on me:
Great bug! I managed to reproduce it here (except that I get a plain seg fault not a GC panic), and it turns out to be an obscure bug in the native code generator that only shows up with GHCi. Compiling the program with -fvia-C works around it. Many thanks for the report. Cheers, Simon