From sean@miscoranda.com

16​:57 <sbp> rakudo​: my @​random-stuff := 1, 3, 4, 7 ... *; say
@​random-stuff[^10].perl
16​:57 <p6eval> rakudo 4bf132​: OUTPUT«Method 'count' not found for
invocant of class 'Failure'␤ in <anon> at line 861​:CORE.setting␤ in
'List​::at_pos' at line 1␤ in 'Any​::postcircumfix​:<[ ]>' at line
1808​:CORE.setting␤ in <anon> at line 1␤ in 'Any​::postcircumfix​:<[
]>' at line 1␤ in main program body at line
16​:57 <p6eval> ..1␤»
16​:57 <sbp> — via jasondavies. is a bug?

--
Sean B. Palmer, http://inamidst.com/sbp/

From @masak

<patrickas> spb reported
<patrickas> rakudo​: my @​random-stuff := 1, 3, 4, 7 ... *; say
@​random-stuff[^10].perl
<p6eval> rakudo 4bf132​: OUTPUT«Method 'count' not found for invocant
of class 'Failure'␤ in <anon> at line 861​:CORE.setting [...]
<patrickas> I replied with
<patrickas> rakudo​: use fatal; my @​random-stuff := 1, 3, 4, 7 ... *;
say @​random-stuff[^10].perl
<p6eval> rakudo 4bf132​: OUTPUT«Unable to figure out pattern of series [...]
<patrickas> that's what I mean by louder ... unless you "use fatal"
you have no idea what went wrong
<masak> huh.
<masak> yes, that one should definitely complain louder.
* masak submits rakudobug

From sean@miscoranda.com

Just to be clear, I'm suggesting the error message should be about the
magic sequence failing. I guess though that since the sequence is
lazy, you can't throw it until you consume. But then why should the
access to .count come before the Failure of the is mooted?

However it's fixed, it's not a very informative error message.

--
Sean B. Palmer, http://inamidst.com/sbp/

From patrick.abisalloum@gmail.com

On Fri Apr 01 01​:26​:41 2011, sean@​miscoranda.com wrote​:

However it's fixed, it's not a very informative error message.

The actual error message is "Unable to figure out pattern of series" which
exactly what we want, the problem is that in the absence of 'use fatal'
this message does not show up and is clobbered by other failures occurring
later.

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

From patrick.abisalloum@gmail.com

Examples of other places where failure message are not shown either.

say (3+4i).Real;
say ()[-3];
say [*..*];
say ('a'=>'b').Numeric;

And the discussion about it on #perl6 :
http://irclog.perlgeek.de/perl6/2011-04-01#i_3445985

From @moritz

Now produces (1, 3, 4, 7, Failure.new(exception =>
X​::Sequence​::Deduction.new())

If you print the sequence, the actual error message will be generated.

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