Immutable immutable strings??

[Artur Skawina]

On 02/10/12 19:07, H. S. Teoh wrote:
> 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?!)

The array itself is immutable, not just the elements.

> 	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?

FWIW, it compiles fine here.

artur