From @AlexDaniel

Code​:
enum Foo <<​:Bar(1) :Baz>>

Result​:
===SORRY!===
Incompatible MROs in P6opaque rebless

<jnthn> That's a crappy error :)

This bug is somewhat similar to https://rt-archive.perl.org/perl6/Ticket/Display.html?id=126987

From @zoffixznet

Still present today on rakudo 89470a​:

<Zoffix> m​: enum Foo <<​:Bar(1) :Baz>>
<camelia> rakudo-moar 89470a​: OUTPUT«===SORRY!===␤Incompatible MROs in P6opaque rebless for types Bool and Foo␤»

From @AlexDaniel

Actually, it's not about the error message. The whole thing can be golfed to this​:

enum Foo (​:Bar(1), :Baz(True))

And the error happens because​:

Code​:
use nqp;
say so nqp​::istype(True, Int);
nqp​::rebless(True, Int)

Result​:
True
Incompatible MROs in P6opaque rebless for types Bool and Int
  in block <unit> at -e line 3

Or something like that. So it is “istype” of something but you can't rebless it.

The type is checked here​:
https://github.com/rakudo/rakudo/blob/de0533c4d4c9f425ce22432a8e4555ded27cba91/src/Perl6/Actions.nqp#L4621

Rebless is here​:
https://github.com/rakudo/rakudo/blob/5144216f6ea723747cb25fea51f99861c1ea213a/src/Perl6/World.nqp#L3629

IRC logs​:
https://irclog.perlgeek.de/perl6/2017-10-07#i_15272313
https://irclog.perlgeek.de/perl6/2017-10-08#i_15272350

I really don't know what to do about it. You cannot just .Int it because stringy enums exist (enum Foo (​:Bar("foo")); say Bar). It's weird.

On 2016-07-10 07​:01​:59, cpan@​zoffix.com wrote​:

Still present today on rakudo 89470a​:

<Zoffix> m​: enum Foo <<​:Bar(1) :Baz>>
<camelia> rakudo-moar 89470a​: OUTPUT«===SORRY!===␤Incompatible MROs in
P6opaque rebless for types Bool and Foo␤»

From @AlexDaniel

Zoffix++ pointed out that there is a problem with IntStr also​:

Code​:
enum Foo (​:Bar(1), :Baz(<42>))

Result​:
===SORRY!===
Incompatible MROs in P6opaque rebless for types IntStr and Foo

On 2017-10-07 17​:16​:30, alex.jakimenko@​gmail.com wrote​:

Actually, it's not about the error message. The whole thing can be
golfed to
this​:

enum Foo (​:Bar(1), :Baz(True))

And the error happens because​:

Code​:
use nqp;
say so nqp​::istype(True, Int);
nqp​::rebless(True, Int)

Result​:
True
Incompatible MROs in P6opaque rebless for types Bool and Int
in block <unit> at -e line 3

Or something like that. So it is “istype” of something but you can't
rebless
it.

The type is checked here​:
https://github.com/rakudo/rakudo/blob/de0533c4d4c9f425ce22432a8e4555ded27cba91/src/Perl6/Actions.nqp#L4621

Rebless is here​:
https://github.com/rakudo/rakudo/blob/5144216f6ea723747cb25fea51f99861c1ea213a/src/Perl6/World.nqp#L3629

IRC logs​:
https://irclog.perlgeek.de/perl6/2017-10-07#i_15272313
https://irclog.perlgeek.de/perl6/2017-10-08#i_15272350

I really don't know what to do about it. You cannot just .Int it
because
stringy enums exist (enum Foo (​:Bar("foo")); say Bar). It's weird.

On 2016-07-10 07​:01​:59, cpan@​zoffix.com wrote​:

Still present today on rakudo 89470a​:

<Zoffix> m​: enum Foo <<​:Bar(1) :Baz>>
<camelia> rakudo-moar 89470a​: OUTPUT«===SORRY!===␤Incompatible MROs
in
P6opaque rebless for types Bool and Foo␤»

From @AlexDaniel

I am pretty sure that this commit is relevant to this issue​: rakudo/rakudo@fc52143

On 2017-10-07 17​:20​:37, alex.jakimenko@​gmail.com wrote​:

Zoffix++ pointed out that there is a problem with IntStr also​:

Code​:
enum Foo (​:Bar(1), :Baz(<42>))

Result​:
===SORRY!===
Incompatible MROs in P6opaque rebless for types IntStr and Foo

On 2017-10-07 17​:16​:30, alex.jakimenko@​gmail.com wrote​:

Actually, it's not about the error message. The whole thing can be
golfed to
this​:

enum Foo (​:Bar(1), :Baz(True))

And the error happens because​:

Code​:
use nqp;
say so nqp​::istype(True, Int);
nqp​::rebless(True, Int)

Result​:
True
Incompatible MROs in P6opaque rebless for types Bool and Int
in block <unit> at -e line 3

Or something like that. So it is “istype” of something but you can't
rebless
it.

The type is checked here​:

https://github.com/rakudo/rakudo/blob/de0533c4d4c9f425ce22432a8e4555ded27cba91/src/Perl6/Actions.nqp#L4621

Rebless is here​:

https://github.com/rakudo/rakudo/blob/5144216f6ea723747cb25fea51f99861c1ea213a/src/Perl6/World.nqp#L3629

IRC logs​:
https://irclog.perlgeek.de/perl6/2017-10-07#i_15272313
https://irclog.perlgeek.de/perl6/2017-10-08#i_15272350

I really don't know what to do about it. You cannot just .Int it
because
stringy enums exist (enum Foo (​:Bar("foo")); say Bar). It's weird.

On 2016-07-10 07​:01​:59, cpan@​zoffix.com wrote​:

Still present today on rakudo 89470a​:

<Zoffix> m​: enum Foo <<​:Bar(1) :Baz>>
<camelia> rakudo-moar 89470a​: OUTPUT«===SORRY!===␤Incompatible MROs
in
P6opaque rebless for types Bool and Foo␤»