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A static analysis tool reports that some callers of symbol_list_n_get might get NULL and not handle it properly. This is not the case, yet we can suppress this pattern. Reported by Mike Sullivan. <https://lists.gnu.org/archive/html/bug-bison/2013-12/msg00027.html> * src/symlist.c (symbol_list_n_get): Actually it is never called to return 0. Enforce this postcondition via aver. (symbol_list_n_type_name_get): Simplify accordingly. In particular, discards a (translated) useless error message. * src/symlist.h: Adjust documentation. * src/scan-code.l: Style change.