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LTA error message when using attributes on type objects #2204

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p6rt opened this issue Oct 4, 2010 · 8 comments
Open

LTA error message when using attributes on type objects #2204

p6rt opened this issue Oct 4, 2010 · 8 comments
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@p6rt p6rt commented Oct 4, 2010

Migrated from rt.perl.org#78200 (status was 'open')

Searchable as RT78200$

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@p6rt p6rt commented Oct 4, 2010

From @masak

From the backlog​:

<hudnix> well I just spent a miserable two hours figuring out that the
error message "Type objects are abstract and have no attributes, but
you tried to access @​!foo" in fact had nothing to do with the
attribute @​!foo or anything else in my class, but was really
complaining that I had declared my object with "my $obj;" instead of
"my $obj .= new"

Would it be possible to have the error message be something like
"Tried to use type object $obj as an instance object"? Especially
having the name of the variable with the object being improperly
accessed seems like it would be a big help in a situation such as the
above.

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@p6rt p6rt commented May 28, 2012

From @coke

On Mon Oct 04 04​:15​:25 2010, masak wrote​:

From the backlog​:

<hudnix> well I just spent a miserable two hours figuring out that the
error message "Type objects are abstract and have no attributes, but
you tried to access @​!foo" in fact had nothing to do with the
attribute @​!foo or anything else in my class, but was really
complaining that I had declared my object with "my $obj;" instead of
"my $obj .= new"

Would it be possible to have the error message be something like
"Tried to use type object $obj as an instance object"? Especially
having the name of the variable with the object being improperly
accessed seems like it would be a big help in a situation such as the
above.

Can we get some sample code that demonstrates this problem?

--
Will "Coke" Coleda

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@p6rt p6rt commented May 28, 2012

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

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@p6rt p6rt commented May 28, 2012

From @masak

masak (>>), Coke (>)​:

From the backlog​:

<hudnix> well I just spent a miserable two hours figuring out that the
error message "Type objects are abstract and have no attributes, but
you tried to access @​!foo" in fact had nothing to do with the
attribute @​!foo or anything else in my class, but was really
complaining that I had declared my object with "my $obj;" instead of
"my $obj .= new"

Would it be possible to have the error message be something like
"Tried to use type object $obj as an instance object"? Especially
having the name of the variable with the object being improperly
accessed seems like it would be a big help in a situation such as the
above.

Can we get some sample code that demonstrates this problem?

<masak> r​: class A { has $!x; method foo { say $!x } }; A.foo
<p6eval> rakudo 197e0b​: OUTPUT«Cannot look up attributes in a type object [...]

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@p6rt p6rt commented Apr 9, 2015

From @FROGGS

How about​:

(before)
$ perl6-m -e 'class A { has $!x; method foo { say $!x } }; A.foo'
Cannot look up attributes in a type object
  in method foo at -e​:1
  in block <unit> at -e​:1

(after)
$ perl6-m -e 'class A { has $!x; method foo { say $!x } }; A.foo'
Cannot look up attributes in a type object. Perhaps you need to instanciate first?
  in method foo at -e​:1
  in block <unit> at -e​:1

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@p6rt p6rt commented Nov 5, 2017

From @AlexDaniel

Hey Tobias, it looks like you've been working on this ticket for over two years. How is it going?
On 2015-04-09 12​:09​:55, FROGGS.de wrote​:

How about​:

(before)
$ perl6-m -e 'class A { has $!x; method foo { say $!x } }; A.foo'
Cannot look up attributes in a type object
in method foo at -e​:1
in block <unit> at -e​:1

(after)
$ perl6-m -e 'class A { has $!x; method foo { say $!x } }; A.foo'
Cannot look up attributes in a type object. Perhaps you need to
instanciate first?
in method foo at -e​:1
in block <unit> at -e​:1

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@p6rt p6rt commented Nov 5, 2017

From @AlexDaniel

FWIW the error message seems to be coming from MoarVM​: https://github.com/MoarVM/MoarVM/blob/ad86184681590c81fc25b9e90b406e5163098796/src/6model/reprconv.c#L607 (many similar lines like this in that file)

On 2017-11-05 07​:46​:17, alex.jakimenko@​gmail.com wrote​:

Hey Tobias, it looks like you've been working on this ticket for over two
years. How is it going?
On 2015-04-09 12​:09​:55, FROGGS.de wrote​:

How about​:

(before)
$ perl6-m -e 'class A { has $!x; method foo { say $!x } }; A.foo'
Cannot look up attributes in a type object
in method foo at -e​:1
in block <unit> at -e​:1

(after)
$ perl6-m -e 'class A { has $!x; method foo { say $!x } }; A.foo'
Cannot look up attributes in a type object. Perhaps you need to
instanciate first?
in method foo at -e​:1
in block <unit> at -e​:1

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@p6rt p6rt commented Nov 10, 2017

From @MasterDuke17

On Sun, 05 Nov 2017 07​:54​:01 -0800, alex.jakimenko@​gmail.com wrote​:

FWIW the error message seems to be coming from MoarVM​:
https://github.com/MoarVM/MoarVM/blob/ad86184681590c81fc25b9e90b406e5163098796/src/6model/reprconv.c#L607
(many similar lines like this in that file)

On 2017-11-05 07​:46​:17, alex.jakimenko@​gmail.com wrote​:

Hey Tobias, it looks like you've been working on this ticket for over
two
years. How is it going?
On 2015-04-09 12​:09​:55, FROGGS.de wrote​:

How about​:

(before)
$ perl6-m -e 'class A { has $!x; method foo { say $!x } }; A.foo'
Cannot look up attributes in a type object
in method foo at -e​:1
in block <unit> at -e​:1

(after)
$ perl6-m -e 'class A { has $!x; method foo { say $!x } }; A.foo'
Cannot look up attributes in a type object. Perhaps you need to
instanciate first?
in method foo at -e​:1
in block <unit> at -e​:1

The error message was recently improved in MoarVM/MoarVM@68a18b4#diff-be9fec83f5b58ba42962ded7b65de075

$ perl6-m -e 'class A { has $!x; method foo { say $!x } }; A.foo'
Cannot look up attributes in a A type object
  in method foo at -e line 1
  in block <unit> at -e line 1

@p6rt p6rt added the Bug label Jan 5, 2020
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