...

compiler/NubLang.CLI/Program.cs

@@ -22,6 +22,18 @@ foreach (var file in args)
     syntaxTrees.Add(syntaxTree);
 }
 
+foreach (var diagnostic in diagnostics)
+{
+    Console.Error.WriteLine(diagnostic.FormatANSI());
+}
+
+if (diagnostics.Any(diagnostic => diagnostic.Severity == DiagnosticSeverity.Error))
+{
+    return 1;
+}
+
+diagnostics.Clear();
+
 ModuleRepository moduleRepository;
 
 try
@@ -55,6 +67,8 @@ if (diagnostics.Any(diagnostic => diagnostic.Severity == DiagnosticSeverity.Erro
     return 1;
 }
 
+diagnostics.Clear();
+
 Directory.CreateDirectory(".build");
 
 for (var i = 0; i < args.Length; i++)