This file is indexed.

/usr/src/gcc-5/debian/libquadmath.symbols is in gcc-5-source 5.3.1-14ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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libquadmath.so.0 #PACKAGE# #MINVER#
 (symver)QUADMATH_1.0 4.6