merge revision(s) 54172: [Backport #12192]
* parse.y (parse_numvar): NTH_REF must be less than a half of INT_MAX, as it is left-shifted to be ORed with back-ref flag. [ruby-core:74444] [Bug#12192] [Fix GH-1296]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@54382 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 54172: [Backport #12192]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@54382 b2dd03c8-39d4-4d8f-98ff-823fe69b080e