-base_isa1.nit:56,9--15: Warning: Expression is already a A since it is a G.
-base_isa1.nit:58,9--15: Warning: Expression is already a B since it is a D.
+base_isa1.nit:56,9--15: Warning: expression is already a `A` since it is a `G`.
+base_isa1.nit:58,9--15: Warning: expression is already a `B` since it is a `D`.