Details

This message is generated when the names of parameters in Function may lead to conflicts with names that are generated automatically by the Wolfram Language.
Names that end in a $ character can lead to this message and should be avoided.
The Wolfram Language generates symbol names that end in a $ character when localizing variables. Name conflicts may arise if names of this form are already in use.
Off[message] switches off the message; On[message] switches it on. For example: Off[Function::fdups].

Examples

An error occurs because of incompatible parameter names:

This example shows valid parameter names in Function:

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