is a global variable that, if set, is applied to the symbol name and tag of messages that are requested but have not yet been defined.



Basic Examples  (1)

A typical value for $NewMessage is a function that searches for messages in file. Note that this value for $NewMessage will also be applied to internal requests for messages and so may result in additional output:

If a message has not previously been generated, the value of $NewMessage is applied and evaluated:

Restore the default value of $NewMessage:

Introduced in 1991