View source for Module:Params/doc/examples/check for unknown parameters

<includeonly>{{#ifexpr:{{#invoke:params|discarding|hello|discarding|wind|count}} > 0
	|{{Error|Error: The only parameters accepted are {{para|hello}} and {{para|wind}}.}}
	|Everything is good: do something
}}</includeonly><noinclude>{{Documentation|heading=[[File:Test Template Info-Icon - Version (2).svg|50px|alt=|link=]] Template documentation}}</noinclude>