Issue #20968 has been updated by mame (Yusuke Endoh). I have updated the behavior to (mostly) suppress the display of `<internal:...>` frames in a backtrace. The algorithm works as follows: * When internal frames appear in a sequence, it retains only one frame -- the one directly called from Ruby code. * The location information of the internal frame is now backpatched with the filename and line number of the caller (similar to how we handle C frames). If you encounter any cases where this algorithm does not work well, please let me know. Please note that this transformation is not applied when using the debug inspector API or `TracePoint#path`, so `<internal:...>` will still appear in those cases. This behavior may change in the future. See also #21395. ---------------------------------------- Misc #20968: `Array#fetch_values` unexpected method name in stack trace https://bugs.ruby-lang.org/issues/20968#change-113784 * Author: koic (Koichi ITO) * Status: Closed ---------------------------------------- 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/