lib/asciidoctor/standoc/deprecated.rb
warn "Please replace your references to Asciidoctor::Standoc with "\
"Metanorma::Standoc and your instances of require 'asciidoctor/standoc' "\
"with require 'metanorma/standoc'"
exit 127 if ENV["METANORMA_DEPRECATION_FAIL"]
Asciidoctor::Standoc = Metanorma::Standoc unless defined? Asciidoctor::Standoc