separate_compiler: Write errors to stderr

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

diff --git a/src/compiler/separate_compiler.nit b/src/compiler/separate_compiler.nit
index 63f5517..8587f4a 100644 (file)
--- a/src/compiler/separate_compiler.nit
+++ b/src/compiler/separate_compiler.nit
@@ -256,7 +256,7 @@ class SeparateCompiler
                                 "Pointer", "Int8", "Int16", "UInt16", "Int32", "UInt32"] do
                        var classes = self.mainmodule.model.get_mclasses_by_name(classname)
                        if classes == null then continue
-                       assert classes.length == 1 else print classes.join(", ")
+                       assert classes.length == 1 else print_error classes.join(", ")
                        self.box_kinds[classes.first] = self.box_kinds.length + 1
                end
        end