Meaning of NOWARN argument for find-file-noselect?

[Kenichi Handa]

It seems that NOWARN argument of find-file-noselect is ignored.
For instance,
(find-file-noselect "NEWFILE" t) shows the message "(NEW
FILE)" if NEWFILE doesn't exist.

(find-file-noselect "/INVALID_DIR/NEWFILE" t) shows the message
 "Use M-x make-directory RET RET to create the directory"
if INVALID_DIR doesn't exist.

Or, does NOWARN actually mean to suppress only this kind of
user interaction?
        File ... changed on disk.  Reread from disk? (yes or no)

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Ken'ichi HANDA
address@hidden