Returns the pathname that compile-file would write into,
if given the same arguments.
The defaults for the output-file
are taken from the pathname
that results from merging the input-file
with the value of *default-pathname-defaults*,
except that the type component
should default to the appropriate
implementation-defined default type for compiled files.
If input-file is a logical pathname and output-file
is unsupplied, the result is a logical pathname.
If input-file is a logical pathname,
it is translated into a physical pathname as if by calling
translate-logical-pathname.
If input-file is a stream,
the stream can be either open or closed.
compile-file-pathname returns the same pathname after a
file is closed as it did when the file was open.
It is an error if input-file is a stream that is
created with make-two-way-stream, make-echo-stream,
make-broadcast-stream, make-concatenated-stream,
make-string-input-stream, make-string-output-stream.
If an implementation supports additional keyword arguments to compile-file,
compile-file-pathname must accept the same arguments.
24 System Construction 
pathname