src/module-impl.lisp: Don't emit `#line' to non-position-aware streams.

Because we can't switch back afterwards, the compiler will blame the
wrong thing.  Also, if the output stream isn't position-aware, it's
probably because we're in the midst of pretty-printing something, and
forcing `#line' directives will produce hideous results.

This is all rather unfortunate.  It's clearly a bug that we can't
produce pretty output and have useful error location information, but I
think this is the best I can manage right now.

diff --git a/src/module-impl.lisp b/src/module-impl.lisp
index 9e74b27..fe6b545 100644 (file)
--- a/src/module-impl.lisp
+++ b/src/module-impl.lisp
@@ -167,7 +167,8 @@
         (line (file-location-line location))
         (filename (file-location-filename location)))
     (cond (line
-          (format stream "~&#line ~D~@[ ~S~]~%" line filename)
+          (when (typep stream 'position-aware-stream)
+            (format stream "~&#line ~D~@[ ~S~]~%" line filename))
           (funcall thunk)
           (when (typep stream 'position-aware-stream)
             (fresh-line stream)