Immutable immutable strings??

[H. S. Teoh]

I'm not sure whether the following a compiler/language bug or a Phobos
bug, but it's definitely some kind of bug:

	auto s = "abc";
	immutable t = "def";

	writeln(typeid(s));	// immutable(char)[]
	writeln(typeid(t));	// immutable(immutable(char)[])
				// (what is this supposed to mean?!)

	char ch = 'c';
	bool b = canFind(s, ch);	// OK
	bool c = canFind(t, ch);	// Compile error??

The compile error is:

test.d:11: Error: template std.algorithm.canFind(alias pred = "a == b",Range,V) if (is(typeof(find!(pred)(range,value)))) does not match any function template declaration
test.d:11: Error: template std.algorithm.canFind(alias pred = "a == b",Range,V) if (is(typeof(find!(pred)(range,value)))) cannot deduce template function from argument types !()(immutable(char[]),char)

Can somebody explain what's going on here?


T

-- 
There are two ways to write error-free programs; only the third one works.