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