1 files changed, 24 insertions, 0 deletions
diff --git a/ext/ripper/test/check-event-arity.rb b/ext/ripper/test/check-event-arity.rb
new file mode 100644
index 0000000000..00e1b98dbc
--- /dev/null
+++ b/ext/ripper/test/check-event-arity.rb
@@ -0,0 +1,24 @@
+def main
+  invalid = false
+  table = {}
+  ARGF.each do |line|
+    next if /\A\#\s*define\s+s?dispatch\d/ === line
+    next if /ripper_dispatch\d/ === line
+    line.scan(/dispatch(\d)\((\w+)/) do |num, ev|
+      num = num.to_i
+      if data = table[ev]
+        locations, arity = data
+        unless num == arity
+          invalid = true
+          puts "arity differ [#{ev}]: #{ARGF.lineno}->#{num}; #{locations.join(',')}->#{arity}"
+        end
+        locations.push ARGF.lineno
+      else
+        table[ev] = [[ARGF.lineno], num.to_i]
+      end
+    end
+  end
+  exit 1 if invalid
+end
+
+main