Better errors for undefined

[wayland]

The error coming from the following would be more useful if it were to complain about the undefined value in some way; what I really want is a documented way to test if it's undefined like this. For the record, calling defined($!height) inside foo() also fails.

#!/usr/bin/raku

use     Physics::Unit;
use     Physics::Measure;

class   Test {
        has Length $.length;
        has Length $.width;

        method  foo {
                say $!length <=> $!width;
        }
}

my $a = Test.new();

$a.foo();

HTH,

[librasteve]

hi @wayland - I tried this... with no Physics::Unit or Physics::Measure...

#!/usr/bin/raku
##use Physics::Unit;
##use Physics::Measure;

class Test {
has Real $.length;
has Real $.width;
method foo {
say $!length <=> $!width;
}
}
my $a = Test.new();

$a.foo();

It gives this error:
Invocant of method 'Bridge' must be an object instance of type 'Real', not a type object of type 'Real'. Did you forget a '.new'?

So I am wondering whether is this a general raku issue - you are comparing 2 undefined objects after all.

I kinda prefer my error ...
Cannot look up attributes in a Physics::Measure::Length type object

What specifically would you propose?

~p6steve