Choose a more appropriate error class in C-API thread specs
Choose a more appropriate error class in C-API thread specs

sgarciac/spec,kachick/rubyspec,kachick/rubyspec,eregon/rubyspec,nobu/rubyspec,wied03/rubyspec,wied03/rubyspec,wied03/rubyspec,sgarciac/spec,nobu/rubyspec,eregon/rubyspec,ruby/rubyspec,ruby/rubyspec,eregon/rubyspec,nobu/rubyspec,ruby/spec,ruby/spec,ruby/spec,kachick/rubyspec,sgarciac/spec