modelize_class: Fix the wording of an error message.

Signed-off-by: Jean-Christophe Beaupré <jcbrinfo@users.noreply.github.com>

diff --git a/src/modelize/modelize_class.nit b/src/modelize/modelize_class.nit
index fc3b254..69aea68 100644 (file)
--- a/src/modelize/modelize_class.nit
+++ b/src/modelize/modelize_class.nit
@@ -291,7 +291,7 @@ redef class ModelBuilder
                                                ntype, false)
                                if mtype == null then continue # Skip because of error
                                if not mtype isa MClassType then
-                                       error(ntype, "Error: supertypes cannot be a formal type.")
+                                       error(ntype, "Error: a supertype cannot be a formal type.")
                                        continue
                                end
                                var superclass = mtype.mclass