General::nosym

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This message is generated by an assignment that does not contain a valid assignment tag.
The assignment tag is the symbol on the left-hand side of the assignment with which the rule created by the assignment will be associated.
Off[message] switches off the message; On[message] switches it on. For example: Off[General::nosym].

Attributes cannot be attached to a pattern expression:

This shows a valid assignment to the Attributes of a symbol:

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