Fix unnecessary template bloat in enforce.

The version of enforce which takes the file and line number as template
arguments has been scheduled for deprecation and has been replaced with
one which takes them as function arguments. The only code that this will
effect is code which explicitly passes the file or line number to
enforce.

std/exception.d

@@ -333,6 +333,7 @@ unittest
     }
 }
 
+
 /++
     If $(D !!value) is true, $(D value) is returned. Otherwise,
     $(D new Exception(msg)) is thrown.
@@ -352,7 +353,19 @@ auto line = readln(f);
 enforce(line.length, "Expected a non-empty line.");
 --------------------
  +/
-T enforce(T, string file = __FILE__, size_t line = __LINE__)
+T enforce(T)(T value, lazy const(char)[] msg = null, string file = __FILE__, size_t line = __LINE__) @safe pure
+{
+    if (!value) bailOut(file, line, msg);
+    return value;
+}
+
+/++
+   $(RED Scheduled for deprecation in January 2013. If passing the file or line
+         number explicitly, please use the version of enforce which takes them as
+         function arguments. Taking them as template arguments causes
+         unnecessary template bloat.)
+ +/
+T enforce(T, string file, size_t line = __LINE__)
     (T value, lazy const(char)[] msg = null) @safe pure
 {
     if (!value) bailOut(file, line, msg);