When I run the testsuite, I have:
Running .../gdb/testsuite/gdb.base/subst.ex ...
DUPLICATE: gdb.base/subst.exp: unset substitute-path from, no rule entered yet
Fix by adjusting the problematic test name.
Tested on x86_64-linux.
gdb_test "unset substitute-path from" \
"No substitution rule defined for `from'" \
- "unset substitute-path from, no rule entered yet"
+ "unset substitute-path from, after unset substitute-path"
gdb_test "unset substitute-path from to" \
"Incorrect usage, too many arguments in command" \