lib/finitio/system.rb in finitio-0.7.0.pre.rc4 vs lib/finitio/system.rb in finitio-0.7.0

@@ -95,19 +95,23 @@
 
     def dup
       System.new(@types.dup, @imports.dup)
     end
 
-    def check_and_warn(io = STDERR)
+    def check_and_warn(logger = nil)
+      logger ||= begin
+        require 'logger'
+        Logger.new(STDERR)
+      end
       each_type do |t|
         next unless t.named?
         each_import do |i|
           next unless found = i.get_type(t.name)
           if found == t
-            STDERR.puts "WARN: duplicate type def `#{t.name}`"
+            logger.info "Duplicate type def `#{t.name}`"
             break
           else
-            STDERR.puts "NOTICE: Type erasure `#{t.name}`"
+            logger.warn "Type erasure `#{t.name}`"
             break
           end
         end
       end
       self