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In lib\ebnf\src\ebnf\grammar\rule.cr:89:48

 89 | def initialize(@atoms = Array(Atom).new, @action = nil)
                                               ^
Error: instance variable @action of EBNF::Bison::Rule was inferred to be Nil, but Nil alone provides no information

require "ebnf"

grammar = <<-Grammar
root:
    foo             { puts "foo" }
    | bar           { puts "bar" }

foo:
    A B
    | B B

bar:
    B A
    | A B
Grammar

bison = EBNF::Bison.from grammar
bison.to_bnf
puts bison

Error in yacc2bnf.cr:18: instantiating 'EBNF::Grammar#to_bnf()'

bison.to_bnf
      ^~~~~~

in lib/ebnf/src/ebnf/to_bnf.cr:78: instantiating 'EBNF::BNF:Module#from_bison(EBNF::Grammar)'

      when Type::Bison then BNF.from_bison dup
                                ^~~~~~~~~~

in lib/ebnf/src/ebnf/to_bnf.cr:6: instantiating 'EBNF::Grammar#each_production()'

      grammar.each_production do |production|
              ^~~~~~~~~~~~~~~

in lib/ebnf/src/ebnf/grammar/grammar.cr:169: instantiating 'Hash(String, EBNF::Production)#each_value()'

      @productions.each_value { |production| yield production }
                   ^~~~~~~~~~

in usr/lib/crystal/core/hash.cr:369: instantiating 'each()'

    each do |key, value|
    ^~~~

in usr/lib/crystal/core/hash.cr:369: instantiating 'each()'

    each do |key, value|
    ^~~~

in lib/ebnf/src/ebnf/grammar/grammar.cr:169: instantiating 'Hash(String, EBNF::Production)#each_value()'

      @productions.each_value { |production| yield production }
                   ^~~~~~~~~~

in lib/ebnf/src/ebnf/to_bnf.cr:6: instantiating 'EBNF::Grammar#each_production()'

      grammar.each_production do |production|
              ^~~~~~~~~~~~~~~

in lib/ebnf/src/ebnf/to_bnf.cr:7: instantiating 'Array(EBNF::Rule)#each_with_index()'

        production.rules.each_with_index do |rule, i|
                         ^~~~~~~~~~~~~~~

in usr/lib/crystal/core/enumerable.cr:377: instantiating 'each()'

    each do |elem|
    ^~~~

in usr/lib/crystal/core/indexable.cr:148: instantiating 'each_index()'

    each_index do |i|
    ^~~~~~~~~~

in usr/lib/crystal/core/indexable.cr:148: instantiating 'each_index()'

    each_index do |i|
    ^~~~~~~~~~

in usr/lib/crystal/core/enumerable.cr:377: instantiating 'each()'

    each do |elem|
    ^~~~

in lib/ebnf/src/ebnf/to_bnf.cr:7: instantiating 'Array(EBNF::Rule)#each_with_index()'

        production.rules.each_with_index do |rule, i|
                         ^~~~~~~~~~~~~~~

in lib/ebnf/src/ebnf/to_bnf.cr:9: wrong number of arguments for 'EBNF::Production#[]=' (given 2, expected 1)
Overloads are:
 - EBNF::Production#[]=(arg)

            production[i] = Rule.new bison_rule.atoms

~/repos/bt/EBNF.cr/ asdf which crystal                  /Users/b/.asdf/installs/crystal/1.7.2/bin/crystal

~/repos/bt/EBNF.cr/ asdf which shards 
/Users/b/.asdf/installs/crystal/1.7.2/embedded/bin/shards

~/repos/bt/EBNF.cr/ shards build --release --production
Dependencies are satisfied
Building: ebnf
Error target ebnf failed to compile:
Showing last frame. Use --error-trace for full trace.

In src/ebnf/grammar/rule.cr:89:48

 89 | def initialize(@atoms = Array(Atom).new, @action = nil)
                                               ^
Error: instance variable @action of EBNF::Bison::Rule was inferred to be Nil, but Nil alone provides no information