c_gtk_paint_vline

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GtkStyle* style, cairo_t* cr, GtkStateType stateType, GtkWidget* widget, const(char)* detail, int y1, int y2, int x) c_gtk_paint_vline;

Meta