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digitalmars.D - Problem with string.whitespace and newline

The following code cannot be compiled
string clean(string x)
	return join(split(x),whitespace);

The compile error is
Error	2	Error: template std.array.join(RoR,R) if (isInputRange!(RoR)
&& isInputRange!(ElementType!(RoR)) && isForwardRange!(R)) cannot
deduce template function from argument types

However this line is fine
 join(split(x)," ");

The same problem happens when using newline. Is this a bug?

Jun 11 2011