From: Mark Wooding <mdw@distorted.org.uk>
Date: Sun, 30 Aug 2015 10:03:22 +0000 (+0100)
Subject: src/module-impl.lisp: Don't emit `#line' to non-position-aware streams.
X-Git-Tag: 0.2.0~48
X-Git-Url: https://git.distorted.org.uk/~mdw/sod/commitdiff_plain/d07588d4c069c5b62f7e5792ea173038d090e531?hp=59146e6e6846ce273a66f990c414e3f1a9c42da5

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
--- 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)