nanInArithmeticExpression
ftp://ftp.de.debian.org/debian/pool/main/f/findutils/findutils_4.10.0.orig.tar.xz
findutils-4.10.0/gnulib-tests/test-isnand.h:41:3: style: Using NaN/Inf in a computation. [nanInArithmeticExpression]
findutils-4.10.0/gnulib-tests/test-trunc1.c:60:3: style: Using NaN/Inf in a computation. [nanInArithmeticExpression]