Tbgu のバックアップ(No.1)

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#include<stdio.h>
 
int main(void)
{
    return x;
}

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// error.c: In function ‘main’:
// error.c:5: error: ‘x’ undeclared (first use in this function)
// error.c:5: error: (Each undeclared identifier is reported only once
// error.c:5: error: for each function it appears in.)