Using replaceInPlace, string and char[]

[TSalm via Digitalmars-d-learn]

Hi,

A newbie question :
I wrote this simple code :

        import std.array;
        import std.stdio;

        void main()
        {

         char[] a = "mon texte 1".dup;
         char[] b = "abc".dup;
         size_t x   = 4;
         size_t y   = 9;
         replaceInPlace( a, x , y, b );
         writeln( a );
        }

But compilation fails :

/usr/include/dmd/phobos/std/array.d(2052): Error: template 
std.algorithm.remove cannot deduce function from argument types 
!()(char[], Tuple!(immutable(uint), uint)), candidates are:
/usr/include/dmd/phobos/std/algorithm.d(8542):        
std.algorithm.remove(SwapStrategy s = SwapStrategy.stable, Range, 
Offset...)(Range range, Offset offset) if (s != 
SwapStrategy.stable && isBidirectionalRange!Range && 
hasLvalueElements!Range && hasLength!Range && Offset.length >= 1)
/usr/include/dmd/phobos/std/algorithm.d(8623):        
std.algorithm.remove(SwapStrategy s = SwapStrategy.stable, Range, 
Offset...)(Range range, Offset offset) if (s == 
SwapStrategy.stable && isBidirectionalRange!Range && 
hasLvalueElements!Range && Offset.length >= 1)
/usr/include/dmd/phobos/std/algorithm.d(8757):        
std.algorithm.remove(alias pred, SwapStrategy s = 
SwapStrategy.stable, Range)(Range range) if 
(isBidirectionalRange!Range && hasLvalueElements!Range)
inout.d(13): Error: template instance 
std.array.replaceInPlace!(char, char[]) error instantiating

Don't understand why this doesn't work: it compiles fine and runs 
perfectly if I change "char[]" by "string" ... don't understand 
why since the documentation says :
      String literals are immutable (read only).

How this function can change a type that is immutable ?

Thanks for your help.
TSalm