what file was it that caused a coding system warning

[Dan Jacobson]

Let's say we are merrily saving files when all the sudden

|These default coding systems were tried:
|  chinese-big5-unix
|However, none of them safely encodes the target text.
|
|Select one of the following safe coding systems:
|  raw-text emacs-mule no-conversion

I think it should say somewhere on the screen what file the problem
occurred upon, lest we weren't paying attention.  Of course it could
also zero in on the problem spot in the file that caused the warning,
so we would know what to fix.
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