 "See " { $url "http://yaml.org/type/merge.html" } $nl
 "As per " { $url "http://sourceforge.net/p/yaml/mailman/message/12308050" }
 ", the merge key is implemented bottom up:" $nl
-{ $example "USING: yaml prettyprint ;
+{ $unchecked-example "USING: yaml prettyprint ;
 \"
 foo: 1
 <<:

"
  }
{ $heading "Output -- verbose" }
  { $example "USING: yaml yaml.config ;"
"f implicit-tags set
f implicit-start set
f implicit-end set

}
{ $examples
  { $heading "Input" }
  { $unchecked-example "USING: prettyprint yaml ;"
"\"- true
- null
- ! 42
