I have tried to understand what's happening here, but I can't tell why some times it accepts the implicit string cast and other times it doesn't:



import std.string: text;

struct Foo1 {
    char[][] matrix;

    string spam() const pure {
        char[] m = text(matrix).dup;
        return m; // OK
    }
}

struct Foo2 {
    enum Bar : char { A }
    Bar[][] matrix;

    string spam1() const pure {
        return text(matrix).dup; // OK
    }

    string spam2() const pure {
        char[] m = text(matrix).dup;
        return m; // line 22, Error
    }

    char[][] matrix2;

    string spam3() const pure {
        char[] m = text(matrix2).dup;
        return m; // line 29, Error.
    }
}

void main() {}


dmd 2.065.0b2 gives:

test.d(22): Error: cannot implicitly convert expression (m) of type char[] to string
test.d(29): Error: cannot implicitly convert expression (m) of type char[] to string


If it's not a compiler bug then I think it's not easy for D newbies to learn such behaviours.