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error message when proto has no implementation (class A { proto method x { * }; }) #6206

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p6rt opened this issue Apr 24, 2017 · 5 comments
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@p6rt
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@p6rt p6rt commented Apr 24, 2017

Migrated from rt.perl.org#131201 (status was 'resolved')

Searchable as RT131201$

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@p6rt p6rt commented Apr 24, 2017

From @AlexDaniel

Code​:
class A {
  proto method x { * };
};
A.x

Result​:
Use of uninitialized value of type Any in string context.
Methods .^name, .perl, .gist, or .say can be used to stringify it to something meaningful.
  in block <unit> at -e line 4
Cannot resolve caller x(A); none of these signatures match​:
  in block <unit> at -e line 4

First of all, it says “none of these signatures match​:” and then it prints the line number. There are no signatures, I get it, but the error message is ugly.

Also, “Use of uninitialized value of type Any in string context.” does not seem to be coming from the user code, I guess it happens during the error message generation, but I could be wrong.

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@p6rt p6rt commented Jun 1, 2017

From kernel.julien@gmail.com

I wrote a PR to try to fix the messages : rakudo/rakudo#1094

I don't know how to indicate to the user that a prototype method is unimplemented.

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@p6rt p6rt commented Jun 1, 2017

From @zoffixznet

On Mon, 24 Apr 2017 04​:32​:33 -0700, alex.jakimenko@​gmail.com wrote​:

Code​:
class A {
proto method x { * };
};
A.x

Result​:
Use of uninitialized value of type Any in string context.
Methods .^name, .perl, .gist, or .say can be used to stringify it to
something meaningful.
in block <unit> at -e line 4
Cannot resolve caller x(A); none of these signatures match​:
in block <unit> at -e line 4

First of all, it says “none of these signatures match​:” and then it
prints the line number. There are no signatures, I get it, but the
error message is ugly.

Also, “Use of uninitialized value of type Any in string context.” does
not seem to be coming from the user code, I guess it happens during
the error message generation, but I could be wrong.

Thank you for the report. jsimonet++ fixed the issue.

Fix​: rakudo/rakudo@02614f6
Test​: rakudo/rakudo@8e0d000

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@p6rt p6rt commented Jun 1, 2017

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

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@p6rt p6rt commented Jun 1, 2017

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

@p6rt p6rt closed this Jun 1, 2017
@p6rt p6rt added the LTA label Jan 5, 2020
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