Mario de Sousa <msousa@fe.up.pt> [Tue, 04 Apr 2017 15:21:42 +0100] rev 1043
Add token reference to all symbol_c, and add list_c::find_element()
Mario de Sousa <msousa@fe.up.pt> [Tue, 04 Apr 2017 10:41:11 +0100] rev 1042
remove debug code left in by mistake in previous commit