From @masak

<masak> rakudo​: my $*x = 42; say $*x.WHAT
<p6eval> rakudo 70667a​: OUTPUT«Int()␤»
<masak> rakudo​: $*x = 42; say $*x.WHAT
<p6eval> rakudo 70667a​: OUTPUT«Cannot assign to readonly value␤current
instr. '&infix​:<=>' pc 15648 (src/builtins/Junction.pir​:169)␤»
* masak submits rakudobug
<masak> rakudo​: $*x = 42
<p6eval> rakudo 70667a​: OUTPUT«Cannot assign to readonly value␤current
instr.​: '&infix​:<=>' pc 15648 (src/builtins/Junction.pir​:169)␤»

I'm not sure dynamic variables can be assigned to without first being
initialized. I skimmed S02 but didn't find anything mentioning it.
Anyway, either you can and the error shouldn't be there, or you can't
and the error is less than awesome.

From @pmichaud

An undeclared dynamic variable currently results in a failure;
attempting to assign to that failure produces the readonly message.

Perhaps assignment to a failure should throw its exception?

Pm

The RT System itself - Status changed from 'new' to 'open'

From @coke

On Mon Feb 15 00​:53​:39 2010, masak wrote​:

<masak> rakudo​: my $*x = 42; say $*x.WHAT
<p6eval> rakudo 70667a​: OUTPUT«Int()␤»
<masak> rakudo​: $*x = 42; say $*x.WHAT
<p6eval> rakudo 70667a​: OUTPUT«Cannot assign to readonly value␤current
instr. '&infix​:<=>' pc 15648 (src/builtins/Junction.pir​:169)␤»
* masak submits rakudobug
<masak> rakudo​: $*x = 42
<p6eval> rakudo 70667a​: OUTPUT«Cannot assign to readonly value␤current
instr.​: '&infix​:<=>' pc 15648 (src/builtins/Junction.pir​:169)␤»

I'm not sure dynamic variables can be assigned to without first being
initialized. I skimmed S02 but didn't find anything mentioning it.
Anyway, either you can and the error shouldn't be there, or you can't
and the error is less than awesome.

Now says​:

23​:34 < [Coke]> rakudo​: $*x = 42; say $*x.WHAT
23​:34 <+p6eval> rakudo cbdd9b​: OUTPUT«Cannot assign to a non-container␤ in <anon>
  at /tmp/meGTbjLflb​:1␤ in <anon> at /tmp/meGTbjLflb​:1␤␤»

--
Will "Coke" Coleda

From @coke

On Mon Sep 19 20​:34​:36 2011, coke wrote​:

On Mon Feb 15 00​:53​:39 2010, masak wrote​:

<masak> rakudo​: my $*x = 42; say $*x.WHAT
<p6eval> rakudo 70667a​: OUTPUT«Int()␤»
<masak> rakudo​: $*x = 42; say $*x.WHAT
<p6eval> rakudo 70667a​: OUTPUT«Cannot assign to readonly
value␤current
instr. '&infix​:<=>' pc 15648 (src/builtins/Junction.pir​:169)␤»
* masak submits rakudobug
<masak> rakudo​: $*x = 42
<p6eval> rakudo 70667a​: OUTPUT«Cannot assign to readonly
value␤current
instr.​: '&infix​:<=>' pc 15648 (src/builtins/Junction.pir​:169)␤»

I'm not sure dynamic variables can be assigned to without first
being
initialized. I skimmed S02 but didn't find anything mentioning it.
Anyway, either you can and the error shouldn't be there, or you
can't
and the error is less than awesome.

Now says​:

23​:34 < [Coke]> rakudo​: $*x = 42; say $*x.WHAT
23​:34 <+p6eval> rakudo cbdd9b​: OUTPUT«Cannot assign to a non-
container␤ in <anon>
at /tmp/meGTbjLflb​:1␤ in <anon> at
/tmp/meGTbjLflb​:1␤␤»

(self-reply-to-add-cc-I-forgot)
--
Will "Coke" Coleda

From @diakopter

On Mon Sep 19 20​:34​:36 2011, coke wrote​:

On Mon Feb 15 00​:53​:39 2010, masak wrote​:

<masak> rakudo​: my $*x = 42; say $*x.WHAT
<p6eval> rakudo 70667a​: OUTPUT«Int()␤»
<masak> rakudo​: $*x = 42; say $*x.WHAT
<p6eval> rakudo 70667a​: OUTPUT«Cannot assign to readonly
value␤current
instr. '&infix​:<=>' pc 15648 (src/builtins/Junction.pir​:169)␤»
* masak submits rakudobug
<masak> rakudo​: $*x = 42
<p6eval> rakudo 70667a​: OUTPUT«Cannot assign to readonly
value␤current
instr.​: '&infix​:<=>' pc 15648 (src/builtins/Junction.pir​:169)␤»

I'm not sure dynamic variables can be assigned to without first
being
initialized. I skimmed S02 but didn't find anything mentioning it.
Anyway, either you can and the error shouldn't be there, or you
can't
and the error is less than awesome.

Now says​:

23​:34 < [Coke]> rakudo​: $*x = 42; say $*x.WHAT
23​:34 <+p6eval> rakudo cbdd9b​: OUTPUT«Cannot assign to a non-
container␤ in <anon>
at /tmp/meGTbjLflb​:1␤ in <anon> at
/tmp/meGTbjLflb​:1␤␤»

Now says​:

14​:52 < diakopter> p6​: $*x = 42; say $*x.WHAT
14​:52 <+p6eval> rakudo 223419​: OUTPUT«Dynamic variable $*x not found␤
in method <anon> at
  src/gen/CORE.setting​:9317␤ in <anon> at
src/gen/Metamodel.pm​:2260␤ in any
  find_method_fallback at src/gen/Metamodel.pm​:2258␤ in
any find_method at
  src/gen/Metamodel.pm​:828␤ in block <anon> at
/tmp/Ivt9zr6xSI​:…
14​:52 <+p6eval> ..pugs​: OUTPUT«Int␤»
14​:52 <+p6eval> ..niecza v18-1-gc86e3f0​: OUTPUT«Unhandled exception​:
Writing to readonly
  scalar␤ at /tmp/qSIatGUdIf line 1 (mainline @​ 2) ␤
at
  /home/p6eval/niecza/lib/CORE.setting line 3910 (ANON @​
3) ␤ at
  /home/p6eval/niecza/lib/CORE.setting line 3911 (module-
CORE @​ 558) ␤ at
  /home/p6eval/niecza/lib…
14​:52 < diakopter> p6​: $*x = 42;
14​:52 <+p6eval> rakudo 223419​: OUTPUT«Dynamic variable $*x not found␤
in method <anon> at
  src/gen/CORE.setting​:9317␤ in <anon> at
src/gen/Metamodel.pm​:2260␤ in any
  find_method_fallback at src/gen/Metamodel.pm​:2258␤ in
any find_method at
  src/gen/Metamodel.pm​:828␤ in block <anon> at
/tmp/Vhay3VPmpQ​:…
14​:52 <+p6eval> ..niecza v18-1-gc86e3f0​: OUTPUT«Unhandled exception​:
Writing to readonly
  scalar␤ at /tmp/EGuxWILmSp line 1 (mainline @​ 2) ␤
at
  /home/p6eval/niecza/lib/CORE.setting line 3910 (ANON @​
3) ␤ at
  /home/p6eval/niecza/lib/CORE.setting line 3911 (module-
CORE @​ 558) ␤ at
  /home/p6eval/niecza/lib…

From @usev6

Assignment to an undeclared dynamic variable fails now with a typed exception "X​::Dynamic​::NotFound" and an adequate error message​:

$ perl6 -e '$*x = 42'
Dynamic variable $*x not found
  in method <anon> at src/gen/m-CORE.setting​:14595
  in any find_method_fallback at src/gen/m-Metamodel.nqp​:2741
  in any find_method at src/gen/m-Metamodel.nqp​:988
  in block <unit> at -e​:1

There is a (passing) test in S32-exceptions/misc.t -- added with commit Raku/roast@5cea4946ce

I'm closing this ticket now.

@usev6 - Status changed from 'open' to 'resolved'