- This function accepts a string as an argument, determines whether the
- Puppet runtime has access to a function by that name. It returns a
- true if the function exists, false if not.
+ @summary
+ **Deprecated:** Determines whether the Puppet runtime has access to a function by that name.
+
+ This function accepts a string as an argument.
+
+ @return [Boolean]
+ Returns `true` or `false`
+
+ > **Note:* **Deprecated** Will be removed in a future version of stdlib. See
+ [`validate_legacy`](#validate_legacy).