int ln = Context.getCurrentLineNumber ();
String url = Context.getCurrentURL ();
if (url == null) return;
// 2) find and remove existing line breakpoint
ClojureLineBreakpoint lb = getClojureBreakpointAnnotationListener().findBreakpoint(url, ln);
if (lb != null) {
d.removeBreakpoint(lb);
return;
}
lb = ClojureLineBreakpoint.create(url