Get Better error message that "is trait on $-sigil variable not yet implemented. Sorry."?

[Gabor Szabo]

I just tried:


> my $x is Int = 42;
===SORRY!=== Error while compiling:
is trait on $-sigil variable not yet implemented. Sorry.
------> my $x is Int⏏ = 42;
    expecting any of:
        constraint

and was a bit disappointed. It took me a while and reading the book of
Andrew Shitov till I tried

> my Int $x = 42;
42


I wonder if the error message could hint at this way of declaring a
type constraint?

Gabor