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Refactor parser_params by removing "in_main" flag
The relation between parser_param#base_block and #in_main were very subtle. A main script (that is passed via a command line) was parsed under base_block = TOPLEVEL_BINDING and in_main = 1. A script loaded by Kernel#require was parsed under base_block = NULL and in_main = 0. If base_block is non-NULL and in_main == 0, it is parsed by Kernel#eval or family. However, we know that TOPLEVEL_BINDING has no local variables when a main script is parsed. So, we don't have to parse a main script under base_block = TOPLEVEL_BINDING. Instead, this change parses a main script under base_block = 0. If base_block is non-NULL, it is parsed by Kernel#eval or family. By this simplication, "in_main" is no longer needed.
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