Require subst/doc

Usage

Metatemplate that can be wrapped around a template that requires substitution.

{{ {{{|safesubst:}}}require subst
   | ... (normal template code) ...
}}

• {{require subst}}: Prints an error unless substituted.
  • {{subst check top}}、{{subst check bottom}}: Same purpose, but used as a pair.
  • {{subst only}}: For the doc of the above templates; prints a message asking for it be substituted.
  • {{nosubst}}: The reverse of {{subst only}}. For the doc of templates which should not be substituted; prints a message asking for it not to be substituted.
• {{issubst}}: Returns "yes" if substituted.
• {{ifsubst}}: Forks if substituted or not.