[ruby-core:121100] [Ruby master Bug#20968] `Array#fetch_values` unexpected method name in stack trace
From:
"Eregon (Benoit Daloze) via ruby-core" <ruby-core@...>
Date:
2025-02-18 10:59:00 UTC
List:
ruby-core #121100
Issue #20968 has been updated by Eregon (Benoit Daloze).
I agree with Jeremy and Jean, this is not a bug.
There are more and more methods implemented in Ruby, and that's a good thing: https://gist.github.com/eregon/912e6359e83781c5fa1c638d3768c526
That means these methods can look slightly different in backtraces, but it doesn't matter, `from <internal:array>:211:in 'Array#fetch_values'` is still in the backtrace above.
It's a bit like `Hash#[]`, if there is an error during calling `key.hash` you will see `#hash` in the backtrace, it's natural.
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Bug #20968: `Array#fetch_values` unexpected method name in stack trace
https://bugs.ruby-lang.org/issues/20968#change-112021
* Author: koic (Koichi ITO)
* Status: Open
* ruby -v: ruby 3.4.0dev (2024-12-19T04:44:56Z master 2783868de2) +PRISM [x86_64-darwin23]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
It seems that the current Ruby implementation is displaying unexpected method name in stack trace.
## Expected
Similar to `Hash#fetch_values`, the method name `Array#fetch_values` is expected to be displayed in the stack trace.
```console
$ ruby -e '{k: 42}.fetch_values(:unknown)'
-e:1:in 'Hash#fetch_values': key not found: :unknown (KeyError)
from -e:1:in '<main>'
$ ruby -e '[1].fetch_values(42)'
-e:1:in 'Array#fetch_values': index 42 outside of array bounds: -1...1 (IndexError)
from -e:1:in '<main>'
```
## Actual
The stack trace displays the `Array#fetch` method, which user is not aware of, along with the `<internal.array>` stack trace.
```console
$ ruby -e '[1].fetch_values(42)'
<internal:array>:211:in 'Array#fetch': index 42 outside of array bounds: -1...1 (IndexError)
from <internal:array>:211:in 'block in Array#fetch_values'
from <internal:array>:211:in 'Array#map!'
from <internal:array>:211:in 'Array#fetch_values'
from -e:1:in '<main>'
```
It likely requires an approach such as implementing it in C, as suggested in https://github.com/ruby/ruby/pull/11555.
--
https://bugs.ruby-lang.org/
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