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int foo( int bar )
{
    int bar = 0;
    return bar;
}

int main()
{
    return foo(1);
}
Compilation error #stdin compilation error #stdout 0s 0KB
stdin
Standard input is empty
compilation info
prog.c: In function ‘foo’:
prog.c:3: error: ‘bar’ redeclared as different kind of symbol
prog.c:1: error: previous definition of ‘bar’ was here
stdout
Standard output is empty