Man pages matching name moosex::declare::syntax::methoddeclaration in section 3pm:

MooseX::Declare::Syntax::MethodDeclaration.3pm.en	debian 10 / libmoosex-declare-perl
MooseX::Declare::Syntax::MethodDeclaration.3pm.en	debian 11 / libmoosex-declare-perl
MooseX::Declare::Syntax::MethodDeclaration.3pm.en	debian 12 / libmoosex-declare-perl