P.C.Callaghan [firstname.lastname@example.org] submitted this bug: I'm trying to use the -caf-all flag with ghc-6.02, in conjunction with -O (which means going via C...) But in a few modules of a large program, the .hc files contain duplicate definitions of "MODsat_CAF_cc_ccs" (where MOD = a particular module) I can't see an obvious pattern to the number of duplications. All the affected modules use MPCs heavily. It doesn't look like the duplications are 1-1 with the instance decls. It only happens on a few modules out of many which also use classes heavily. NB I hand-patched the .hc files by hand, and in the results, not much of the dictionary/caf info showed up! Should -auto-dicts work?