@internalsref{TrillSpanner}, @internalsref{line-spanner-interface}.
Examples:
-@inputfileref{input/@/regression,text@/-spanner@/.ly}.
-@inputfileref{input/@/regression,line@/-style/.ly}.
-@inputfileref{input/@/regression,text@/-spanner@/.ly}.
@inputfileref{input/@/regression,dynamics@/-text@/-spanner@/-padding.ly}.
@inputfileref{input/@/regression,glissando@/-broken@/.ly}.
+@inputfileref{input/@/regression,line@/-arrows@/.ly}.
+@inputfileref{input/@/regression,line@/-style@/.ly}.
+@inputfileref{input/@/regression,text@/-spanner@/.ly}.
+@inputfileref{input/@/regression,text@/-spanner@/.ly}.
@node Text spanners