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Strange MOP type check cache error message when doing <at_pos(1)> in a regex in Rakudo #2637

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p6rt opened this issue Feb 3, 2012 · 3 comments
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@p6rt p6rt commented Feb 3, 2012

Migrated from rt.perl.org#109734 (status was 'open')

Searchable as RT109734$

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@p6rt p6rt commented Feb 3, 2012

From @masak

<masak> how would you split a string into the first character and the
rest of the string in Perl 6?
<moritz> .split(/<at_pos(1)>/)
<jnthn> ooh
<moritz> nom​: say 'foobar'.split(/<at_pos(1)>/).perl
<p6eval> nom acbec8​: OUTPUT«No type check cache and no type_check
method in meta-object␤ in method reify [...]
<jnthn> How in the hell...
<moritz> jnthn​: indeed.
<moritz> I get the same output locally
* masak submits rakudobug
<jnthn> OK, what is at_pos doing... :)
<jnthn> Wild guess​: using nqp​::getattr somewhere it should be using
nqp​::getattr_i :)
<moritz> erm, is it even spelled at_pos?
<moritz> I might as well be misremembering something
<masak> at the very least, it's an LTA error message.
<p6eval> nom acbec8​: OUTPUT«=> <>␤ at => <>␤␤»
<moritz> star​: say 'foobar'.split(/<at(1)>/).perl
<p6eval> star 2012.01​: OUTPUT«("f", "oobar").list␤»
<masak> \o/
<moritz> ok, it helps to spell it correctly :-)
<jnthn> \o/
<masak> so, error is in using something that doesn't exist :)
<masak> typical "programmer never tried this path" thinko :)
<jnthn> nom​: say Any.^methods
<p6eval> nom acbec8​: OUTPUT«eager elems end classify uniq infinite
flat hash list pick roll reverse sort values keys kv pairs Array grep
first join map min max minmax postcircumfix​:<[ ]> at_pos all any one
none postcircumfix​:<{ }> reduce ACCEPTS␤»
<masak> oh!
<moritz> well, at_pos comes from Any
<jnthn> There's an at_pos in Any
<masak> right.
<masak> so it does something completely different.
<moritz> yes.
<masak> and the regex engine gets sad.
<jnthn> And doesn't return a cursor which...yes, that. :)
<masak> I will report this as best I can :P

So, at_pos returns something which the regex engine didn't expect, and
instead of failing gracefully, it fails disgracefully. Please fix.

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@p6rt p6rt commented Feb 11, 2016

From @skids

Checked on what the current behavior is​:

$ perl6 -e 'say "foobar".split(/<at_pos(1)>/).perl'
Method 'at_pos' not found for invocant of class 'Cursor'
  in block <unit> at -e line 1

...so for actually unknown methods the error message is fine. (AT-POS now)

However, the error for known but not cursor-returning methods is still LTA, though different​:

$ perl6 -e 'say "foobar".split(/<AT-POS(1)>/).perl'
P6opaque​: no such attribute '$!pos'
  in block <unit> at -e line 1

$ perl6 -e 'say "foobar".split(/<Bool>/).perl'
P6opaque​: no such attribute '$!pos'
  in block <unit> at -e line 1

$ perl6 -e 'say "foobar".split(/<pos>/).perl'
P6opaque​: no such attribute '$!pos'
  in block <unit> at -e line 1

$ perl6 -e 'say "foobar".split(/<prune>/).perl'
Cannot look up attributes in a type object
  in block <unit> at -e line 1

$ perl6 -e 'say "foobar".split(/<from>/).perl'
P6opaque​: no such attribute '$!pos'
  in block <unit> at -e line 1

$ perl6 -e 'say "foobar".split(/<target>/).perl'
P6opaque​: no such attribute '$!pos'
  in block <unit> at -e line 1

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@p6rt p6rt commented Feb 11, 2016

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

@p6rt p6rt added the Bug label Jan 5, 2020
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