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EBNF::Base#make_bnf with native parser fails on grammars which use :diff / exception operator #16
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Description
Describe the bug
When trying to convert the EBNF specification of XML 1.0 found here, I get this exception:
/home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/gems/ebnf-2.6.0/lib/ebnf/rule.rb:304:in 'EBNF::Rule#to_bnf': Encountered :diff, which is a rule, not :terminal (RuntimeError)
from /home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/gems/ebnf-2.6.0/lib/ebnf/rule.rb:279:in 'block in EBNF::Rule#to_bnf'
from /home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/gems/ebnf-2.6.0/lib/ebnf/rule.rb:279:in 'Array#map'
from /home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/gems/ebnf-2.6.0/lib/ebnf/rule.rb:279:in 'EBNF::Rule#to_bnf'
from /home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/gems/ebnf-2.6.0/lib/ebnf/bnf.rb:15:in 'block in EBNF::BNF#make_bnf'
from /home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/gems/ebnf-2.6.0/lib/ebnf/bnf.rb:13:in 'Array#each'
from /home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/gems/ebnf-2.6.0/lib/ebnf/bnf.rb:13:in 'EBNF::BNF#make_bnf'
from (irb):10:in '<main>'
from <internal:kernel>:168:in 'Kernel#loop'
from /home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/gems/irb-1.17.0/exe/irb:9:in '<top (required)>'
from /home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/bin/irb:25:in 'Kernel#load'
from /home/phillipdavis/everyday/dev/mboa/maqam/.gems/ruby/3.4.0/bin/irb:25:in '<top (required)>'
from /home/phillipdavis/.local/share/gem/ruby/gems/bundler-2.6.9/lib/bundler/cli/exec.rb:59:in 'Kernel.load'
from /home/phillipdavis/.local/share/gem/ruby/gems/bundler-2.6.9/lib/bundler/cli/exec.rb:59:in 'Bundler::CLI::Exec#kernel_load'
from /home/phillipdavis/.local/share/gem/ruby/gems/bundler-2.6.9/lib/bundler/cli/exec.rb:23:in 'Bundler::CLI::Exec#run'
from /home/phillipdavis/.local/share/gem/ruby/gems/bundler-2.6.9/lib/bundler/cli.rb:452:in 'Bundler::CLI#exec'
from /home/phillipdavis/.local/share/gem/ruby/gems/bundler-2.6.9/lib/bundler/vendor/thor/lib/thor/command.rb:28:in 'Bundler::Thor::Command#run'
... 10 levels...
To reproduce
Steps to reproduce the behavior:
EBNF.parse(/* the grammar */, format: native).make_bnf
Expected behavior
It converts the grammar into a BNF
Screenshots
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Additional context
Gems included by the bundle:
* addressable (2.8.9)
* ast (2.4.3)
* base64 (0.3.0)
* bcp47_spec (0.2.1)
* bigdecimal (3.3.1)
* date (3.5.1)
* ebnf (2.6.0)
* erb (6.0.2)
* htmlentities (4.4.2)
* io-console (0.8.2)
* irb (1.17.0)
* jennifer (0.0.0 5f71c9d)
* json (2.18.1)
* json-schema (6.1.0)
* language_server-protocol (3.17.0.5)
* link_header (0.0.8)
* lint_roller (1.1.0)
* logger (1.7.0)
* maqam (0.1.0)
* matrix (0.4.3)
* mcp (0.8.0)
* minitest (5.27.0)
* ostruct (0.6.3)
* parallel (1.27.0)
* parser (3.3.10.2)
* pp (0.6.3)
* prettyprint (0.2.0)
* prism (1.9.0)
* psych (5.3.1)
* public_suffix (7.0.5)
* racc (1.8.1)
* rainbow (3.1.1)
* rake (13.3.1)
* rantly (3.0.0)
* rbs (3.10.3)
* rdf (3.3.4)
* rdoc (7.2.0)
* readline (0.0.4)
* regexp_parser (2.11.3)
* reline (0.6.3)
* rubocop (1.85.0)
* rubocop-ast (1.49.0)
* ruby-progressbar (1.13.0)
* scanf (1.0.0)
* stringio (3.2.0)
* sxp (2.0.0)
* tsort (0.2.0)
* unicode-display_width (3.2.0)
* unicode-emoji (4.2.0)
* unicode-types (1.11.0)
phillipdavis in ~/.../mboa/maqam on master✗ λ bundle exec ruby --version ruby 3.4.8 (2025年12月17日 revision 995b59f666) +PRISM [x86_64-linux]