Fixing the previous change: instead of instanciating nodes that are

aliasing polymorphic operators afterwards,  use the rigth type in the
first     place    when     building    the     alias     node    (in
Lazycompiler.make_alias_node).

src/test/Makefile

@@ -99,7 +99,7 @@ test_ec:
 		(ec2c /tmp/xx.ec >> test_ec.res 2>&1 && echo -n "ok ") || echo " KO!";\
 	done; \
 	diff -u test_ec.res.exp test_ec.res > test_ec.diff || \
-		(cat test.diff ; echo "cf test.diff"; exit 1)
+		(cat test_ec.diff ; echo "cf test_ec.diff"; exit 1)
 
 
 utest_ec:
@@ -115,7 +115,7 @@ test_lv4:
 		(lus2ec /tmp/xx.lus `lusinfo /tmp/xx.lus nodes | head -n 1` >> test_lv4.res 2>&1 && echo -n "ok ") || echo " KO!";\
 	done; \
 	diff -u test_lv4.res.exp test_lv4.res > test_lv4.diff || \
-		(cat test.diff ; echo "cf test.diff"; exit 1)
+		(cat test_lv4.diff ; echo "cf test_lv4.diff"; exit 1)
 
 
 utest_lv4: