-- Post-condition: the returned Insts are full zonked
unifyCtxts [] = panic "unifyCtxts []"
unifyCtxts (sig1 : sigs) -- Argument is always non-empty
-- Post-condition: the returned Insts are full zonked
unifyCtxts [] = panic "unifyCtxts []"
unifyCtxts (sig1 : sigs) -- Argument is always non-empty