Man pages matching name moosex::singlearg in section 3pm:

MooseX::SingleArg.3pm.en	debian 10 / libmoosex-singlearg-perl
MooseX::SingleArg.3pm.en	debian 11 / libmoosex-singlearg-perl
MooseX::SingleArg.3pm.en	debian 12 / libmoosex-singlearg-perl