Show_Mels refers to def_mel_fun but it is not defined anywhere.

[agryman]

See

acm16/versions/version-1.4/src/maple/acm1.4.mpl

Line 4827 in 10920ca

mel_fun::procedure:=def_mel_fun,

Show_Mels:=proc(Melements::Matrix, Lvals::list,
                  mel_lst::list(list),
                  toshow::integer:=glb_rat_num,
                  mel_fun::procedure:=def_mel_fun,
                  scale::constant:=1.0,
                  mel_format::string:=def_mel_format,
                  mel_desg::string:=def_mel_desg,$)