+\version "2.12.3"
+
+\header {
+ texidoc = "A warning is printed if a dynamic spanner is
+unterminated."
+}
+
+<<
+ \new Staff {
+ % warning expected: unterminated crescendo
+ c'1\<
+ }
+ \new Staff {
+ % warning expected: unterminated decrescendo
+ c'1\>
+ }
+>>
+