Label specs: Simplify and regularize block-scoped label specs
Label specs: Simplify and regularize block-scoped label specs

There is no need to test 3 labels from the outside scope, 1 is enough.

luisvt/pegjs,mcanthony/pegjs,Sciumo/pegjs,pegjs/pegjs,Mingun/pegjs,pegjs/pegjs,Sciumo/pegjs,Mingun/pegjs,luisvt/pegjs,mcanthony/pegjs,jlturner/pegjs,jlturner/pegjs