You can compile this to see a lack of warning.
test.c (text/x-csrc), 1.50 KB, created by Linus Torvalds on 2019-02-25 22:33:26 UTC
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Creator: Linus Torvalds
Created: 2019-02-25 22:33:26 UTC
Size: 1.50 KB
Actions: View
Attachments on bug 89501: 45820