Details

This message is generated when the same name is used for both fixed-length patterns and variable-length patterns in the same rule.
A variable-length pattern is a pattern such as __ or ___ that can match expressions with variable length.
Off[message] switches off the message; On[message] switches it on. For example: Off[Pattern::patv].

Examples

The same symbol is used as the name of a pattern of fixed length and a pattern of variable length:

Wolfram Language code: {1, 4, 3, 2, 1} /. {p_, p__} -> {{p}, {p}}

This rule can be applied without error if different names are used for the elements in the pattern:

Wolfram Language code: {1, 4, 3, 2, 1} /. {p_, q__} -> {{p}, {q}}

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