Can't cast variable length data to slice ([]u8 in this case).

[shawnl]

I should be able to do this:

var char: u21 = undefined;
var hex_escape_bytes: u2 = undefined;
...
                std.fmt.hexToBytes(@ptrCast(*[hex_escape_bytes]u8, &char).*[0..],
                    char_token[2...2 + hex_escape_bytes]) catch unreachable;

Its not a VLA because it is being cast to a slice.

I don't need to use hexToBytes, I can just use charToDigit directly (i also don't want to create the slice manually), but I wanted to note this.

[shawnl]

related to #863

[shawnl]

It would be nice if this could be done in a way that preserved the bounds checking.

[andrewrk]

not a valid example because hex_escape_bytes is a runtime value.