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* data/bison.simple, data/bison.c++: Use `b4_pre_prologue' and `b4_post_prologue' instead of `b4_prologue'. * src/output.c (prepare): Add the `pre_prologue' and `post_prologue' muscles. (output): Free pre_prologue_obstack and post_prologue_obstack. * src/files.h, src/files.c (attrs_obstack): Remove. (pre_prologue_obstack, post_prologue_obstack): New. * src/reader.c (copy_definition): Add a parameter to specify the obstack to fill, instead of using attrs_obstack unconditionally. (read_declarations): Pass pre_prologue_obstack to copy_definition if `%union' has not yet been seen, pass post_prologue_obstack otherwise.