(lispref.info)Compilation Errors

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Debugging Problems in Compilation

   When an error happens during byte compilation, it is normally due to
invalid syntax in the program you are compiling.  The compiler prints a
suitable error message in the `*Compile-Log*' buffer, and then stops.
The message may state a function name in which the error was found, or
it may not.  Regardless, here is how to find out where in the file the
error occurred.

   What you should do is switch to the buffer ` *Compiler Input*'.
(Note that the buffer name starts with a space, so it does not show up
in `M-x list-buffers'.)  This buffer contains the program being
compiled, and point shows how far the byte compiler was able to read.

   If the error was due to invalid Lisp syntax, point shows exactly
where the invalid syntax was *detected*.  The cause of the error is not
necessarily near by!  Use the techniques in the previous section to find
the error.

   If the error was detected while compiling a form that had been read
successfully, then point is located at the end of the form.  In this
case, it can't localize the error precisely, but can still show you
which function to check.

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