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