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C99 eliminated implicit function declarations from the C language \[[ISO/IEC9899IEC 9899-1999:TC2|AA. C References#ISO/IEC 9899-19991999TC2]\]. However, many compilers allow compilation of programs containing implicitly defined functions, although they may issue a warning message. These warnings should be resolved \[[MSC00-A|MSC00-A. Compile cleanly at high warning levels]\], but do not prevent program compilation.