fix a bug locating for derivations
fix a bug locating for derivations


Former-commit-id: 5ad06a1fdb37dfbf588236ded54c3f8c1c8feef4
muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous,muslih/alfanous