% basic
% unknown
*** [alias] unknown: command bargle is unknown
% ambiguous
*** [alias] ambiguous: command s is ambiguous
% recursive
*** [alias] recursive: circular dependency on recursive
adding foo
% with opts
C foo
% with opts and whitespace
0 e63c23eaa88a | 1970-01-01 00:00 +0000
% interaction with defaults
0:e63c23eaa88a
-1:000000000000