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sub echo(Int $x) {
    say $x.^name; 
...
--output:--
Int
echo() received 3

sub echo(Int $x) {
...

--output:--
Int

sub echo(Int:D $x) {
    say $x.^name;
...
'Int', not a type object of type 'Int'.  Did you forget a '.new'?
  in sub echo at b.raku line 14
  in block <unit> at b.raku line 18

sub echo(Int:U $x) {
    say $x.^name;
...
not an object instance of type 'Int'.  Did you forget a 'multi'?
  in sub echo at b.raku line 14
  in block <unit> at b.raku line 22

multi sub echo(Int:U $x) {
    say $x.^name;
...
}

echo(3);

sub echo(Int:D: $x) {
    say $x.^name;
...
------> sub echo(Int:D: $x⏏) {
    expecting any of:
        constraint

class Dog {
    has Str $.name;
...
bark
bark
bark

class Dog {
    has Str $.name;
...
bark
bark
bark

class Dog {
    has Str $.name;
...
        say "bark" for 1..$x;       
    }
}

class Dog {
    has Str $.name;
...

my $d = Dog.new(name => "Rover");
$d.bark(3);

class Dog {
    has Str $.name;
...
a type object of type 'Dog'.  Did you forget a '.new'?
  in method bark at b.raku line 30
  in block <unit> at b.raku line 36

class Dog {
    has Str $.name;
...
bark
bark
bark

class Dog {
    has Str $.name;
...
  in method bark at b.raku line 30
  in block <unit> at b.raku line 39

routine chr

multi sub    chr(Int:D  --> Str:D)
multi method chr(Int:D: --> Str:D)

32] > chr(99);
c

[33] > 99.chr
c

my method m(Int:D: $b){
    say self.^name
...
my $i = 1;
$i.&m(<a>);
# OUTPUT: «Int»