Added new condition for non-URL related parsing errors, used in

parsing.cl.  This needs further reworking, so that URL-related syntax
errors are subtypes of this new condition.

src/main/conditions.cl

@@ -44,3 +44,14 @@ this makes sense.")
 	     (report-clash-error condition stream
 		     (simple-condition-format-control condition)
 		     (simple-condition-format-arguments condition)))))
+
+(define-condition clash-syntax-error (clash-error)
+  ((fragment :initarg :fragment :reader clash-syntax-error-fragment)
+   (reason :initarg :reason :reader clash-syntax-error-reason))
+  (:default-initargs :code +HTTP-Code-Bad-Request+)
+  (:report (lambda (condition stream)
+	     (report-clash-error
+	      condition stream
+	      "Syntax error while parsing ~S: ~A"
+	      (list (clash-syntax-error-fragment condition)
+		    (clash-syntax-error-reason condition))))))