Rule::rhs RuleDelayed::rhs

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This message is generated when a pattern is encountered on the right-hand side of a rule.
This is a warning message about an unusual use of patterns. It does not necessarily indicate an error.
A pattern is an expression that matches something other than itself. x_ and p__ are examples of common patterns.
Patterns are typically used only on the left-hand sides of rules and assignments.
Off[message] switches off the message; On[message] switches it on. For example: Off[Rule::rhs].

A warning message is generated because the pattern p_ is used in an unusual way on the right-hand side of the rule:

This shows a more typical use of a pattern in a rule:

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