Ruby » Ruby master

merges r21571 from trunk into ruby_1_9_1.

• ruby.c (process_options): decrement parse_in_eval to recognize
  parsing main or normal eval script.
• compile.c (rb_parse_in_main): return 1 if parsing main script.
  (if parse_in_eval is negative value, it means main script)
• parse.y (yycompile0): check rb_parse_in_main() to accumulate
  script text. Bug #848 [ruby-core:20450]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@21576 b2dd03c8-39d4-4d8f-98ff-823fe69b080e