Yesterday, I was compiling a function in SLIME, and I consistently got
error: illegal function call messages from SBCL. The function was a
pretty complicated one, and I couldn't figure out the error. I even
resorted to commenting out sections, until I had an empty shell, with
only the docstring. Then realization dawned — here is a simplified
example of how the function looked like:
(defun foo (bar) "Docstring, followed by accidental dot". (let ((baz (1+ bar))) baz))
Did you notice the dot? I didn't, for a while (guess I should take breaks every hour or so and rest my eyes, especially in the evening). But the reader did.