Commented work-around, now throwing error again.

src/Traits.jl

@@ -252,10 +252,10 @@ function isfitting(tmm::Method, fm::Method; verbose=false) # tm=trait-method, fm
  # There is a strange bug which is prevented by this never
  # executing @show. I'll try and investigate this in branch
  # m3/heisenbug
- if length(tm.sig)==-10
- @show tm
- error("This is not possible")
- end
+ # if length(tm.sig)==-10
+ #  @show tm
+ #  error("This is not possible")
+ # end
  end