pub unsafe extern "C" fn gtk_source_buffer_backward_iter_to_source_mark(
buffer: *mut GtkSourceBuffer,
iter: *mut GtkTextIter,
category: *const c_char,
) -> gboolean
pub unsafe extern "C" fn gtk_source_buffer_backward_iter_to_source_mark(
buffer: *mut GtkSourceBuffer,
iter: *mut GtkTextIter,
category: *const c_char,
) -> gboolean