Handle :rational type nodes via generic mutator

lib/mutant/ast/types.rb

@@ -41,8 +41,11 @@ module Mutant
       # Nodes that are NOT generated by parser but used by mutant / unparser.
       EXTRA = symbolset.(%w[empty])
 
+      # Nodes that are currently missing from parser META
+      MISSING = symbolset.(%w[rational])
+
       # All node types mutant handles
-      ALL = symbolset.((Parser::Meta::NODE_TYPES + EXTRA) - BLACKLIST)
+      ALL = symbolset.((Parser::Meta::NODE_TYPES + EXTRA + MISSING) - BLACKLIST)
     end # Types
   end # AST
 end # Mutant

lib/mutant/mutator/node/generic.rb

@@ -13,7 +13,7 @@ module Mutant
           :alias, :for, :xstr, :back_ref, :class,
           :sclass, :match_with_lvasgn, :while_post,
           :until_post, :preexe, :postexe, :iflipflop, :eflipflop, :kwsplat,
-          :shadowarg
+          :shadowarg, :rational
         )
 
       private