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* lib/uri/generic.rb (WFKV_): unroll the loop of regexp.

* lib/uri/generic.rb (URI.decode_www_form_component): ditto.

Conflicts:
	ChangeLog
	lib/uri/common.rb

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 * tool/ytab.sed: fix for Bison 2.6.




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https://github.com/ruby/ruby/pull/458

   * util.c (ruby_strtod): ignore too long fraction part, which does not
     affect the result.

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	* ext/json/parser/parser.rl (json_string_unescape): workaround fix
	  for over optimization of GCC 4.7. [ruby-core:42085] [Bug #5888]
	  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51862


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	* cont.c (cont_restore_0): prevent optimizing out `sp'. sp is used for
	  reserving a memory space with ALLOCA_N for restoring machine stack
	  stored in cont->machine_stack, but clang optimized out it (and
	  maybe #5851 is also caused by this).
	  This affected TestContinuation#test_check_localvars.

	* cont.c (cont_restore_1): revert workaround introduced in r32201.


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