This file is indexed.

/usr/src/gcc-7/debian/libgfortran.symbols is in gcc-7-source 7.3.0-16ubuntu3.

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

The actual contents of the file can be viewed below.

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libgfortran.so.4 #PACKAGE# #MINVER#
 (symver)GFORTRAN_7 7
 (symver)GFORTRAN_C99_7 7
 (symver)GFORTRAN_F2C_7 7