Cannot generate railroad diagrams for ABNF files from the examples #68
Description
I tried to generate railroad diagram for the TOML file format's ABNF grammar and it failed silently:
$ kgt -l abnf -e rrtext < toml.abnf
There are 5 ABNF example files that ship with kgt:
$ ls -1 examples/*.abnf
examples/abnf.abnf
examples/datetime.abnf
examples/irc.abnf
examples/postal.abnf
examples/utf8.abnf
kgt is able to generate railroad diagrams only for 2 of them. The following 3 ABNF files do not product any output:
$ kgt -l abnf -e rrtext < examples/abnf.abnf
$ kgt -l abnf -e rrtext < examples/irc.abnf
$ kgt -l abnf -e rrtext < examples/postal.abnf
What am I doing wrong? 🤔