Use Ripper::Filter.method_defined?(:state) instead of RUBY_VERSION >= '2.5.0'

aycabta · aycabta · commit 55d568dd9c20 · 2017-10-25T21:05:46.000+09:00
diff --git a/lib/rdoc/parser/ripper_state_lex.rb b/lib/rdoc/parser/ripper_state_lex.rb
@@ -2,7 +2,7 @@
 
 class RDoc::RipperStateLex
   # TODO: Remove this constants after Ruby 2.4 EOL
-  RIPPER_HAS_LEX_STATE = (RUBY_VERSION >= '2.5.0')
+  RIPPER_HAS_LEX_STATE = Ripper::Filter.method_defined?(:state)
 
   EXPR_NONE = 0
   EXPR_BEG = 1
