Given

    char x[];

why is

    typeof("a" ~ x)

`char[]` when

    typeof("a" ~ x.idup)

is

    `string`?

My case is

class NameLookupException : Exception
{
    this(string name) {
        super("Name " ~ name ~ " could not be found");
    }
    this(scope const(char)[] name) {
        super("Name " ~ name.idup ~ " could not be found");
    }
}

where I instead would like to only need

class NameLookupException : Exception
{
    this(scope const(char)[] name) {
        super("Name " ~ name ~ " could not be found");
    }
}

Why isn't

    "Name " ~ name ~ " could not be found"

implicitly convertible to `string`?

Would

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

be ok?

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