import std.stdio;
import std.typecons;

private immutable auto extensionTable = [
        ["WGL_ARB_make_current_read",
        "void function(int, int, int)", "wglMakeContextCurrentARB",
        "void function()", "wglGetCurrentReadDCARB"],

        ["WGL_ARB_pixel_format_float"],

        ["WGL_ARB_create_context",
        "void function(int, int, int)", "wglCreateContextAttribsARB"],
];

private template genTypes()
{
    string eval()
    {
        string code;
        foreach (array; extensionTable)
        {
            for (int index = 1; index < array.length; index += 2)
            {
                code ~= "alias nothrow " ~ array[index] ~ " da_" ~ array[index + 1] ~ ";";
            }
        }
        return code;
    }
    string genTypes = eval();
    //const(char[]) genTypes = eval(); // fix
}

mixin(genTypes!()); // Error: variable genTypes cannot be read at compile time

void main()
{
    assert(is(da_wglCreateContextAttribsARB));
}