tdb: enforce hashing, via example hash in old rwlocks entry in header.
[ccan] / ccan / check_type / test /
drwxr-xr-x   ..
-rw-r--r-- 133 compile_fail-check_type.c
-rw-r--r-- 253 compile_fail-check_type_unsigned.c
-rw-r--r-- 162 compile_fail-check_types_match.c
-rw-r--r-- 562 run.c