diff --git a/lib/racc/grammarfileparser.rb b/lib/racc/grammarfileparser.rb
index f227e158..69870257 100644
--- a/lib/racc/grammarfileparser.rb
+++ b/lib/racc/grammarfileparser.rb
@@ -295,7 +295,7 @@ def _add_many_rule(prev)
       return target if target
       target = _gen_target_name("many", prev)
       @many_rule_registry[prev.to_s] = target
-      src = SourceText.new("result = val[1] ? val[1].unshift(val[0]) : val", __FILE__, __LINE__)
+      src = SourceText.new("result = val[1] ? val[1].unshift(val[0]) : val", @filename, @scanner.lineno + 1)
       act = UserAction.source_text(src)
       @grammar.add Rule.new(target, [], act)
       @grammar.add Rule.new(target, [prev, target], act)
@@ -308,7 +308,7 @@ def _add_many1_rule(prev)
       return target if target
       target = _gen_target_name("many1", prev)
       @many1_rule_registry[prev.to_s] = target
-      src = SourceText.new("result = val[1] ? val[1].unshift(val[0]) : val", __FILE__, __LINE__)
+      src = SourceText.new("result = val[1] ? val[1].unshift(val[0]) : val", @filename, @scanner.lineno + 1)
       act = UserAction.source_text(src)
       @grammar.add Rule.new(target, [prev], act)
       @grammar.add Rule.new(target, [prev, target], act)
@@ -323,7 +323,7 @@ def _add_group_rule(enum)
       unless target = @group_rule_registry[target_name]
         target = @grammar.intern("-group@#{target_name}", true)
         @group_rule_registry[target_name] = target
-        src = SourceText.new("result = val", __FILE__, __LINE__)
+        src = SourceText.new("result = val", @filename, @scanner.lineno + 1)
         act = UserAction.source_text(src)
         rules.each do |syms, sprec|
           rule = Rule.new(target, syms, act)
diff --git a/test/assets/group.y b/test/assets/group.y
new file mode 100644
index 00000000..3f4ad272
--- /dev/null
+++ b/test/assets/group.y
@@ -0,0 +1,15 @@
+class MyParser
+rule
+stmt: ('a')
+end
+---- header
+require 'strscan'
+---- inner
+def parse(str)
+  @ss = StringScanner.new(str)
+  do_parse
+end
+def next_token
+  @ss.skip(/\\s+/)
+  token = @ss.scan(/\\S+/) and [token, token]
+end
diff --git a/test/assets/many.y b/test/assets/many.y
new file mode 100644
index 00000000..20ea4079
--- /dev/null
+++ b/test/assets/many.y
@@ -0,0 +1,15 @@
+class MyParser
+rule
+stmt: 'abc'*
+end
+---- header
+require 'strscan'
+---- inner
+def parse(str)
+  @ss = StringScanner.new(str)
+  do_parse
+end
+def next_token
+  @ss.skip(/\\s+/)
+  token = @ss.scan(/\\S+/) and [token, token]
+end
diff --git a/test/assets/many1.y b/test/assets/many1.y
new file mode 100644
index 00000000..15ec02b5
--- /dev/null
+++ b/test/assets/many1.y
@@ -0,0 +1,15 @@
+class MyParser
+rule
+stmt: 'abc'+
+end
+---- header
+require 'strscan'
+---- inner
+def parse(str)
+  @ss = StringScanner.new(str)
+  do_parse
+end
+def next_token
+  @ss.skip(/\\s+/)
+  token = @ss.scan(/\\S+/) and [token, token]
+end
diff --git a/test/assets/optional.y b/test/assets/optional.y
new file mode 100644
index 00000000..e76d11af
--- /dev/null
+++ b/test/assets/optional.y
@@ -0,0 +1,15 @@
+class MyParser
+rule
+stmt: 'abc'?
+end
+---- header
+require 'strscan'
+---- inner
+def parse(str)
+  @ss = StringScanner.new(str)
+  do_parse
+end
+def next_token
+  @ss.skip(/\\s+/)
+  token = @ss.scan(/\\S+/) and [token, token]
+end
diff --git a/test/regress/group b/test/regress/group
new file mode 100644
index 00000000..b844f8c1
--- /dev/null
+++ b/test/regress/group
@@ -0,0 +1,113 @@
+#
+# DO NOT MODIFY!!!!
+# This file is automatically generated by Racc 1.8.0
+# from Racc grammar file "group.y".
+#
+
+require 'racc/parser.rb'
+
+require 'strscan'
+class MyParser < Racc::Parser
+
+module_eval(<<'...end group.y/module_eval...', 'group.y', 8)
+def parse(str)
+  @ss = StringScanner.new(str)
+  do_parse
+end
+def next_token
+  @ss.skip(/\\s+/)
+  token = @ss.scan(/\\S+/) and [token, token]
+end
+...end group.y/module_eval...
+##### State transition tables begin ###
+
+racc_action_table = [
+     2,     4,     5 ]
+
+racc_action_check = [
+     0,     1,     4 ]
+
+racc_action_pointer = [
+    -2,     1,   nil,   nil,     2,   nil ]
+
+racc_action_default = [
+    -3,    -3,    -1,    -2,    -3,     6 ]
+
+racc_goto_table = [
+     1,     3 ]
+
+racc_goto_check = [
+     1,     2 ]
+
+racc_goto_pointer = [
+   nil,     0,     1 ]
+
+racc_goto_default = [
+   nil,   nil,   nil ]
+
+racc_reduce_table = [
+  0, 0, :racc_error,
+  1, 6, :_reduce_1,
+  1, 5, :_reduce_none ]
+
+racc_reduce_n = 3
+
+racc_shift_n = 6
+
+racc_token_table = {
+  false => 0,
+  :error => 1,
+  "a" => 2,
+  "-temp-group" => 3 }
+
+racc_nt_base = 4
+
+racc_use_result_var = true
+
+Racc_arg = [
+  racc_action_table,
+  racc_action_check,
+  racc_action_default,
+  racc_action_pointer,
+  racc_goto_table,
+  racc_goto_check,
+  racc_goto_default,
+  racc_goto_pointer,
+  racc_nt_base,
+  racc_reduce_table,
+  racc_token_table,
+  racc_shift_n,
+  racc_reduce_n,
+  racc_use_result_var ]
+Ractor.make_shareable(Racc_arg) if defined?(Ractor)
+
+Racc_token_to_s_table = [
+  "$end",
+  "error",
+  "\"a\"",
+  "\"-temp-group\"",
+  "$start",
+  "stmt",
+  "\"-group@\\\"a\\\"\"" ]
+Ractor.make_shareable(Racc_token_to_s_table) if defined?(Ractor)
+
+Racc_debug_parser = false
+
+##### State transition tables end #####
+
+# reduce 0 omitted
+
+module_eval(<<'.,.,', 'group.y', 4)
+  def _reduce_1(val, _values, result)
+    result = val
+    result
+  end
+.,.,
+
+# reduce 2 omitted
+
+def _reduce_none(val, _values, result)
+  val[0]
+end
+
+end   # class MyParser
diff --git a/test/regress/many b/test/regress/many
new file mode 100644
index 00000000..64b3d8af
--- /dev/null
+++ b/test/regress/many
@@ -0,0 +1,119 @@
+#
+# DO NOT MODIFY!!!!
+# This file is automatically generated by Racc 1.8.0
+# from Racc grammar file "many.y".
+#
+
+require 'racc/parser.rb'
+
+require 'strscan'
+class MyParser < Racc::Parser
+
+module_eval(<<'...end many.y/module_eval...', 'many.y', 8)
+def parse(str)
+  @ss = StringScanner.new(str)
+  do_parse
+end
+def next_token
+  @ss.skip(/\\s+/)
+  token = @ss.scan(/\\S+/) and [token, token]
+end
+...end many.y/module_eval...
+##### State transition tables begin ###
+
+racc_action_table = [
+     2,     4,     2,     6 ]
+
+racc_action_check = [
+     0,     1,     2,     4 ]
+
+racc_action_pointer = [
+    -2,     1,     0,   nil,     3,   nil,   nil ]
+
+racc_action_default = [
+    -1,    -4,    -1,    -3,    -4,    -2,     7 ]
+
+racc_goto_table = [
+     3,     1,     5 ]
+
+racc_goto_check = [
+     2,     1,     2 ]
+
+racc_goto_pointer = [
+   nil,     1,     0 ]
+
+racc_goto_default = [
+   nil,   nil,   nil ]
+
+racc_reduce_table = [
+  0, 0, :racc_error,
+  0, 5, :_reduce_1,
+  2, 5, :_reduce_2,
+  1, 4, :_reduce_none ]
+
+racc_reduce_n = 4
+
+racc_shift_n = 7
+
+racc_token_table = {
+  false => 0,
+  :error => 1,
+  "abc" => 2 }
+
+racc_nt_base = 3
+
+racc_use_result_var = true
+
+Racc_arg = [
+  racc_action_table,
+  racc_action_check,
+  racc_action_default,
+  racc_action_pointer,
+  racc_goto_table,
+  racc_goto_check,
+  racc_goto_default,
+  racc_goto_pointer,
+  racc_nt_base,
+  racc_reduce_table,
+  racc_token_table,
+  racc_shift_n,
+  racc_reduce_n,
+  racc_use_result_var ]
+Ractor.make_shareable(Racc_arg) if defined?(Ractor)
+
+Racc_token_to_s_table = [
+  "$end",
+  "error",
+  "\"abc\"",
+  "$start",
+  "stmt",
+  "\"-many@abc\"" ]
+Ractor.make_shareable(Racc_token_to_s_table) if defined?(Ractor)
+
+Racc_debug_parser = false
+
+##### State transition tables end #####
+
+# reduce 0 omitted
+
+module_eval(<<'.,.,', 'many.y', 4)
+  def _reduce_1(val, _values, result)
+    result = val[1] ? val[1].unshift(val[0]) : val
+    result
+  end
+.,.,
+
+module_eval(<<'.,.,', 'many.y', 4)
+  def _reduce_2(val, _values, result)
+    result = val[1] ? val[1].unshift(val[0]) : val
+    result
+  end
+.,.,
+
+# reduce 3 omitted
+
+def _reduce_none(val, _values, result)
+  val[0]
+end
+
+end   # class MyParser
diff --git a/test/regress/many1 b/test/regress/many1
new file mode 100644
index 00000000..c0a279d0
--- /dev/null
+++ b/test/regress/many1
@@ -0,0 +1,119 @@
+#
+# DO NOT MODIFY!!!!
+# This file is automatically generated by Racc 1.8.0
+# from Racc grammar file "many1.y".
+#
+
+require 'racc/parser.rb'
+
+require 'strscan'
+class MyParser < Racc::Parser
+
+module_eval(<<'...end many1.y/module_eval...', 'many1.y', 8)
+def parse(str)
+  @ss = StringScanner.new(str)
+  do_parse
+end
+def next_token
+  @ss.skip(/\\s+/)
+  token = @ss.scan(/\\S+/) and [token, token]
+end
+...end many1.y/module_eval...
+##### State transition tables begin ###
+
+racc_action_table = [
+     2,     4,     2,     6 ]
+
+racc_action_check = [
+     0,     1,     2,     4 ]
+
+racc_action_pointer = [
+    -2,     1,     0,   nil,     3,   nil,   nil ]
+
+racc_action_default = [
+    -4,    -4,    -1,    -3,    -4,    -2,     7 ]
+
+racc_goto_table = [
+     3,     1,     5 ]
+
+racc_goto_check = [
+     2,     1,     2 ]
+
+racc_goto_pointer = [
+   nil,     1,     0 ]
+
+racc_goto_default = [
+   nil,   nil,   nil ]
+
+racc_reduce_table = [
+  0, 0, :racc_error,
+  1, 5, :_reduce_1,
+  2, 5, :_reduce_2,
+  1, 4, :_reduce_none ]
+
+racc_reduce_n = 4
+
+racc_shift_n = 7
+
+racc_token_table = {
+  false => 0,
+  :error => 1,
+  "abc" => 2 }
+
+racc_nt_base = 3
+
+racc_use_result_var = true
+
+Racc_arg = [
+  racc_action_table,
+  racc_action_check,
+  racc_action_default,
+  racc_action_pointer,
+  racc_goto_table,
+  racc_goto_check,
+  racc_goto_default,
+  racc_goto_pointer,
+  racc_nt_base,
+  racc_reduce_table,
+  racc_token_table,
+  racc_shift_n,
+  racc_reduce_n,
+  racc_use_result_var ]
+Ractor.make_shareable(Racc_arg) if defined?(Ractor)
+
+Racc_token_to_s_table = [
+  "$end",
+  "error",
+  "\"abc\"",
+  "$start",
+  "stmt",
+  "\"-many1@abc\"" ]
+Ractor.make_shareable(Racc_token_to_s_table) if defined?(Ractor)
+
+Racc_debug_parser = false
+
+##### State transition tables end #####
+
+# reduce 0 omitted
+
+module_eval(<<'.,.,', 'many1.y', 4)
+  def _reduce_1(val, _values, result)
+    result = val[1] ? val[1].unshift(val[0]) : val
+    result
+  end
+.,.,
+
+module_eval(<<'.,.,', 'many1.y', 4)
+  def _reduce_2(val, _values, result)
+    result = val[1] ? val[1].unshift(val[0]) : val
+    result
+  end
+.,.,
+
+# reduce 3 omitted
+
+def _reduce_none(val, _values, result)
+  val[0]
+end
+
+end   # class MyParser
diff --git a/test/regress/optional b/test/regress/optional
new file mode 100644
index 00000000..93945e4d
--- /dev/null
+++ b/test/regress/optional
@@ -0,0 +1,109 @@
+#
+# DO NOT MODIFY!!!!
+# This file is automatically generated by Racc 1.8.0
+# from Racc grammar file "optional.y".
+#
+
+require 'racc/parser.rb'
+
+require 'strscan'
+class MyParser < Racc::Parser
+
+module_eval(<<'...end optional.y/module_eval...', 'optional.y', 8)
+def parse(str)
+  @ss = StringScanner.new(str)
+  do_parse
+end
+def next_token
+  @ss.skip(/\\s+/)
+  token = @ss.scan(/\\S+/) and [token, token]
+end
+...end optional.y/module_eval...
+##### State transition tables begin ###
+
+racc_action_table = [
+     2,     4,     5 ]
+
+racc_action_check = [
+     0,     1,     4 ]
+
+racc_action_pointer = [
+    -2,     1,   nil,   nil,     2,   nil ]
+
+racc_action_default = [
+    -1,    -4,    -2,    -3,    -4,     6 ]
+
+racc_goto_table = [
+     1,     3 ]
+
+racc_goto_check = [
+     1,     2 ]
+
+racc_goto_pointer = [
+   nil,     0,     1 ]
+
+racc_goto_default = [
+   nil,   nil,   nil ]
+
+racc_reduce_table = [
+  0, 0, :racc_error,
+  0, 5, :_reduce_none,
+  1, 5, :_reduce_none,
+  1, 4, :_reduce_none ]
+
+racc_reduce_n = 4
+
+racc_shift_n = 6
+
+racc_token_table = {
+  false => 0,
+  :error => 1,
+  "abc" => 2 }
+
+racc_nt_base = 3
+
+racc_use_result_var = true
+
+Racc_arg = [
+  racc_action_table,
+  racc_action_check,
+  racc_action_default,
+  racc_action_pointer,
+  racc_goto_table,
+  racc_goto_check,
+  racc_goto_default,
+  racc_goto_pointer,
+  racc_nt_base,
+  racc_reduce_table,
+  racc_token_table,
+  racc_shift_n,
+  racc_reduce_n,
+  racc_use_result_var ]
+Ractor.make_shareable(Racc_arg) if defined?(Ractor)
+
+Racc_token_to_s_table = [
+  "$end",
+  "error",
+  "\"abc\"",
+  "$start",
+  "stmt",
+  "\"-option@abc\"" ]
+Ractor.make_shareable(Racc_token_to_s_table) if defined?(Ractor)
+
+Racc_debug_parser = false
+
+##### State transition tables end #####
+
+# reduce 0 omitted
+
+# reduce 1 omitted
+
+# reduce 2 omitted
+
+# reduce 3 omitted
+
+def _reduce_none(val, _values, result)
+  val[0]
+end
+
+end   # class MyParser
diff --git a/test/test_racc_command.rb b/test/test_racc_command.rb
index 4fd6ac38..3f3f9593 100644
--- a/test/test_racc_command.rb
+++ b/test/test_racc_command.rb
@@ -350,5 +350,29 @@ def test_ifelse
         Turn on logging with "-v" and check ".output" file for details
       STDERR
     end
+
+    def test_optional
+      assert_compile 'optional.y'
+      assert_debugfile 'optional.y', [0, 0, 0, 0]
+      assert_output_unchanged 'optional.y'
+    end
+
+    def test_many
+      assert_compile 'many.y'
+      assert_debugfile 'many.y', [0, 0, 0, 0]
+      assert_output_unchanged 'many.y'
+    end
+
+    def test_many1
+      assert_compile 'many1.y'
+      assert_debugfile 'many1.y', [0, 0, 0, 0]
+      assert_output_unchanged 'many1.y'
+    end
+
+    def test_group
+      assert_compile 'group.y'
+      assert_debugfile 'group.y', [0, 0, 0, 0]
+      assert_output_unchanged 'group.y'
+    end
   end
 end