-- unit test cleanup
-- unit tests
cstr erase

scc -a3         "size(str(\"abcd\") - 'b')"
scc -a2         "size(str(\"1abcd2\") - ro::isalpha)"
scc -a3         "dchar s;   s << \"abcd123\";   s - ro::isalpha; size(s)"

scc "auto rc9=range(c9);  rc9 - rc9/'b'"
ac-123