// Test that environment substitutions work
# This is also a comment (in several simulators)
-f $VERILATOR_ROOT/test_regress/t/t_flag_f__2.vc
// Env var with .v file, and parens
// Double slash below is intentional, as allowed in other tools
${VERILATOR_ROOT}/test_regress/t//t_flag_f__3.v
// Test -f
-F $VERILATOR_ROOT/test_regress/t/tsub/t_flag_f_tsub.vc