ability to iterate over a tuple with an inline for loop, when the tuple has runtime fields in it

[andrewrk]

See #77

[hryx]

Shouldn't this be closed because of #208 ? Once that's done, one can iterate over a "var args" struct parameter with meta.fields() right?

Edit: as @daurnimator points out, there is still C varargs to worry about.

[andrewrk]

This works:

const std = @import("std");
test "aoeu" {
    var tuple = .{1, 2};
    inline for (tuple) |x| {
        std.debug.warn("{}\n", .{x});
    }
}

however this should work but does not:

const std = @import("std");
test "aoeu" {
    var runtime_two: i32 = 2;
    var tuple = .{1, runtime_two};
    inline for (tuple) |x| {
        std.debug.warn("{}\n", .{x});
    }
}

gives

/home/andy/Downloads/zig/build/test.zig:5:25: error: cannot store runtime value in compile time variable
    inline for (tuple) |x| {
                        ^

Zig needs to not make x a comptime variable when iterating over a tuple. In fact it is a value that will sometimes be comptime, sometimes not.

[nektro]

fixing the snippet to use std.log.debug makes this work now