Errors showing methods of writemime()

[MikeInnes]

Here's a fun one.

julia> using FixedPointNumbers

julia> stringmime("text/html", methods(writemime))
ERROR: type UnionType has no field body
 in show at show.jl:80 (repeats 2 times)
 in print_to_string at /Users/mike/Documents/Julia-0.3.0.app/Contents/Resources/julia/lib/julia/sys.dylib
 in argtype_decl at methodshow.jl:18
 in arg_decl_parts at methodshow.jl:30
 in writemime at methodshow.jl:108
 in writemime at methodshow.jl:137
 in sprint at iostream.jl:229
 in stringmime at multimedia.jl:71
 in stringmime at multimedia.jl:88

julia> methods(writemime) # or methods(fft)
# Same error

julia> methods(sqrt)
# Fine

julia> methods(show)
ERROR: `nbitsfrac` has no method matching nbitsfrac(::Type{Ufixed})
 in show at /Users/mike/.julia/v0.3/FixedPointNumbers/src/ufixed.jl:165
 in show at expr.jl:53
 in show_delim_array at show.jl:178
 in show at methodshow.jl:38
 in show_method_table at methodshow.jl:61
 in show at methodshow.jl:74
 in anonymous at show.jl:1122
 in with_output_limit at /Users/mike/Documents/Julia-0.3.0.app/Contents/Resources/julia/lib/julia/sys.dylib
 in showlimited at show.jl:1121
 in writemime at replutil.jl:2
 in display at REPL.jl:118
 in display at REPL.jl:121
 in display at multimedia.jl:149
 in print_response at REPL.jl:140
 in print_response at REPL.jl:125
 in anonymous at REPL.jl:584
 in run_interface at /Users/mike/Documents/Julia-0.3.0.app/Contents/Resources/julia/lib/julia/sys.dylib (repeats 2 times)
 in run_frontend at /Users/mike/Documents/Julia-0.3.0.app/Contents/Resources/julia/lib/julia/sys.dylib
 in run_repl at /Users/mike/Documents/Julia-0.3.0.app/Contents/Resources/julia/lib/julia/sys.dylib
 in _start at /Users/mike/Documents/Julia-0.3.0.app/Contents/Resources/julia/lib/julia/sys.dylib (repeats 2 times)

But this only occurs after FixedPointNumbers is loaded (and AFAICT no other packages cause the problem).

(v0.3 BTW)

[timholy]

It's fixed here: JuliaMath/FixedPointNumbers.jl#9. @JeffBezanson just needs to review & merge.

I found this one to be quite tricky to debug. It would be nice if it were possible for broken show methods to give better errors (but I understand that "brain surgery" on the system used for displaying things might make that difficult...)