Details

This message is generated when a tagged assignment is used incorrectly with functions that select assignment tags in a special way.
This message can occur in assignments involving Attributes, Context, Default, Format, MessageName, and N.
A tagged assignment is an assignment based on TagSet or TagSetDelayed where the tag is specified explicitly in the assignment.
Off[message] switches off the message; On[message] switches it on. For example: Off[General::tag].

Examples

The tag for assignments to Attributes[expr] is taken from expr:

Wolfram Language code: Attributes/:Attributes[testfunction] = Listable

This shows a valid assignment for the attributes of a symbol:

Wolfram Language code: Attributes[testfunction] = Listable

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