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Warnings

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Compilation time: 0.12 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 4 Mb, absolute service time: 0.35 sec 
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Warning(s):
source_file.c: In function ‘main’:
source_file.c:11:5: warning: ignoring return value of ‘foo’, declared with attribute warn_unused_result [-Wunused-result]
     foo();
     ^
Hello World!