diff -r 490206ac8a6a base/src/java/lang/exceptions.d
--- a/base/src/java/lang/exceptions.d	Tue Jul 13 17:10:14 2010 +0200
+++ b/base/src/java/lang/exceptions.d	Tue Jul 13 22:03:48 2010 +0200
@@ -170,23 +170,22 @@
 }
 
 /// Extension to the D Exception
-void ExceptionPrintStackTrace( Exception e ){
-    ExceptionPrintStackTrace( e, & getDwtLogger().error );
-}
-
-/// Extension to the D Exception
-void ExceptionPrintStackTrace( Throwable e, void delegate ( String file, ulong line, String fmt, ... ) dg ){
+void ExceptionPrintStackTrace( Throwable e, bool infoOnly=false ){
 version (D_Version2){
     // D 2 stacktrace info is different.
-    //implMissing(__FILE__, __LINE__);
-    dg( e.file, e.line, e.toString() );
+    // Phobos currently has stack tracing only on Linux.
+    // Revisit this when that changes.
+    auto print = infoOnly ? &getDwtLogger().info!() : &getDwtLogger.error!();
+    print( e.file, e.line, e.toString() );
 }else{
+    auto print = infoOnly ? &getDwtLogger().info!(String, long, String) :
+                            &getDwtLogger().error!(String, long, String);
     Throwable exception = e;
     while( exception !is null ){
-        dg( exception.file, exception.line, "Exception in {}({}): {}", exception.file, exception.line, exception.msg );
+        print( exception.file, exception.line, "Exception in {}({}): {}", exception.file, exception.line, exception.msg );
         if( exception.info !is null ){
             foreach( frame; exception.info ){
-                dg( exception.file, exception.line, "trc {} {}", frame.file, frame.line );
+                print( exception.file, exception.line, "trc {} {}", frame.file, frame.line, "" );
             }
         }
         exception = exception.next;
diff -r 490206ac8a6a base/src/java/lang/util.d
--- a/base/src/java/lang/util.d	Tue Jul 13 17:10:14 2010 +0200
+++ b/base/src/java/lang/util.d	Tue Jul 13 22:03:48 2010 +0200
@@ -28,77 +28,79 @@
     String GSHARED(String s) { return s; }
 }
 
-
-interface IDwtLogger {
-    void trace( String file, ulong line, String fmt, ... );
-    void info( String file, ulong line, String fmt, ... );
-    void warn( String file, ulong line, String fmt, ... );
-    void error( String file, ulong line, String fmt, ... );
-    void fatal( String file, ulong line, String fmt, ... );
-}
-
 version(Tango){
-    class DwtLogger : IDwtLogger {
+    class DwtLogger {
         tango.util.log.Log.Logger logger;
         private this( char[] name ){
             logger = tango.util.log.Log.Log.lookup( name );
         }
-        private char[] format( String file, ulong line, String fmt, TypeInfo[] types, void* argptr ){
-            auto msg = Format.convert( types, argptr, fmt );
+        char[] format( T... )( String file, ulong line, String fmt, T args ){
+            auto msg = Format( fmt, args );
             auto text = Format( "{} {}: {}", file, line, msg );
             return text;
         }
-        void trace( String file, ulong line, String fmt, ... ){
+        void trace(T...)(String file, ulong line, String fmt, T args){
             if( logger.trace ){
-                logger.trace( format( file, line, fmt, _arguments, _argptr ));
+                logger.trace( format( file, line, fmt, args ));
             }
         }
-        void info( String file, ulong line, String fmt, ... ){
+        void info(T...)(String file, ulong line, String fmt, T args){
             if( logger.info ){
-                logger.info( format( file, line, fmt, _arguments, _argptr ));
+                logger.info( format( file, line, fmt, args ));
             }
         }
-        void warn( String file, ulong line, String fmt, ... ){
+        void warn(T...)(String file, ulong line, String fmt, T args){
             if( logger.warn ){
-                logger.warn( format( file, line, fmt, _arguments, _argptr ));
+                logger.warn( format( file, line, fmt, args ));
             }
         }
-        void error( String file, ulong line, String fmt, ... ){
+        void error(T...)(String file, ulong line, String fmt, T args){
             if( logger.error ){
-                logger.error( format( file, line, fmt, _arguments, _argptr ));
+                logger.error( format( file, line, fmt, args ));
             }
         }
-        void fatal( String file, ulong line, String fmt, ... ){
+        void fatal(T...)(String file, ulong line, String fmt, T args){
             if( logger.fatal ){
-                logger.fatal( format( file, line, fmt, _arguments, _argptr ));
+                logger.fatal( format( file, line, fmt, args));
             }
         }
     }
 } else { // Phobos
-    class DwtLogger : IDwtLogger {
+    class DwtLogger {
         private this( String name ){
         }
-        void trace( String file, ulong line, String fmt, ... ){
-            std.stdio.writefln( "TRC %s %d: %s", file, line, fmt );
+        private void writeLine( T... )( String prefix, String file, ulong line, String fmt, T args )
+        {
+            std.stdio.write( prefix, " ", file, " ", line, ": " );
+            fmt = std.string.replace( fmt, "{}", "%s" );
+            std.stdio.writefln(fmt, args);
         }
-        void info( String file, ulong line, String fmt, ... ){
-            std.stdio.writefln( "INF %s %d: %s", file, line, fmt );
+        void trace( T... )( String file, ulong line, String fmt, T args )
+        {
+            writeLine( "TRC", file, line, fmt, args );
         }
-        void warn( String file, ulong line, String fmt, ... ){
-            std.stdio.writefln( "WRN %s %d: %s", file, line, fmt );
+        void info( T... )( String file, ulong line, String fmt, T args )
+        {
+            writeLine( "INF", file, line, fmt, args );
         }
-        void error( String file, ulong line, String fmt, ... ){
-            std.stdio.writefln( "ERR %s %d: %s", file, line, fmt );
+        void warn( T... )( String file, ulong line, String fmt, T args )
+        {
+            writeLine( "WRN", file, line, fmt, args );
         }
-        void fatal( String file, ulong line, String fmt, ... ){
-            std.stdio.writefln( "FAT %s %d: %s", file, line, fmt );
+        void error( T... )( String file, ulong line, String fmt, T args )
+        {
+            writeLine( "ERR", file, line, fmt, args );
+        }
+        void fatal( T... )( String file, ulong line, String fmt, T args )
+        {
+            writeLine( "FAT", file, line, fmt, args );
         }
     }
 }
 
 private mixin(GSHARED(`DwtLogger dwtLoggerInstance;`));
 
-IDwtLogger getDwtLogger(){
+DwtLogger getDwtLogger(){
     if( dwtLoggerInstance is null ){
         synchronized{
             if( dwtLoggerInstance is null ){