Type of string literal concatenated with non-immutable char array

[ag0aep6g]

On 31.01.21 22:48, Per Nordlöw wrote:
> Why isn't
> 
>      "Name " ~ name ~ " could not be found"
> 
> implicitly convertible to `string`?

If concatenation is guaranteed to allocate a new array, then it should 
be "strongly pure", and the conversion should work. I'm not sure if it 
is guaranteed to allocate a new array.

> Would
> 
> class NameLookupException : Exception
> {
>      this(scope const(char)[] name) @trusted {
>          super("Name " ~ cast(string)name ~ " could not be found");
>      }
> }
> 
> be ok?

Only if you know for sure that you're dealing with a compiler bug here.

As another workaround, you can use std.conv.text:

     import std.conv: text;
     super(text("Name ", name, " could not be found"));