c_gtk_source_completion_item_new_from_stock

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)
GtkSourceCompletionItem* function(gchar* label, gchar* text, gchar* stock, gchar* info) c_gtk_source_completion_item_new_from_stock;

Meta