cgrammar 0.9.1

A comprehensive C language grammar parser library written in Rust, implementing the C23 standard (ISO/IEC 9899:2023).
Documentation 
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//en.cppreference.com/w/c/program/atexit.html
#include <stdlib.h>
#include <stdio.h>
 
void f1(void)
{
    puts("f1");
}
 
void f2(void)
{
    puts("f2");
}
 
int main(void)
{
    if ( ! atexit(f1) && ! atexit(f2) && ! atexit(f2) )
        return EXIT_SUCCESS ;
 
    // atexit registration failed
    return EXIT_FAILURE ;
 
}   // <- if registration was successful calls f2, f2, f1