Updating SVN tree A gcc/testsuite/gfortran.dg/data_substring.f90 U gcc/testsuite/ChangeLog A gcc/testsuite/g++.dg/cpp1z/constexpr-83692.C U gcc/cp/constexpr.c U gcc/cp/ChangeLog U gcc/cp/typeck2.c U gcc/cp/cp-tree.h U gcc/fortran/decl.c U gcc/fortran/ChangeLog Updated to revision 257963. Adjusting file timestamps