c_gtk_source_gutter_renderer_pixbuf_set_icon_name

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(GtkSourceGutterRendererPixbuf* renderer, const(char)* iconName) c_gtk_source_gutter_renderer_pixbuf_set_icon_name;

Meta