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Bug #7678

Updated by nobu (Nobuyoshi Nakada) over 9 years ago

=begin 
 ((|$_|)) $_ and ((|$~|)) $~ have thread local method scope, but are shared across fibers in same thread. 

   $ ./ruby -v -e '/a/ =~ "a"; p $~; Fiber.new{/b/=~"b"; p $~}.resume; p $~' 
   ruby 2.0.0dev (2013-01-09 trunk 38748) [x86_64-darwin11] 
   #<MatchData "a"> 
   #<MatchData "b"> 
   #<MatchData "b"> 

 But, it is cleared at (({Fiber.start})). Fiber.start. 

   $ ./ruby -v -e '/a/ =~ "a"; p $~; Fiber.new{p $~}.resume; p $~' 
   ruby 2.0.0dev (2013-01-09 trunk 38748) [x86_64-darwin11] 
   #<MatchData "a"> 
   nil 
   nil 

 These two behaviors seem mismatched.    I think: 

 * If they should be shared, then the latter example should show same 
   (({MatchData})) MatchData 3 times. 

 * If they should be cleared at starting fibers, those variables in the 
   original fiber should be unchanged. 
 =end 

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