[ruby-core:93410] [Ruby trunk Bug#15708] Implicit numbered argument decomposes an array

Issue #15708 has been updated by mame (Yusuke Endoh).


@eregon I think sawa says "This behavior was intentional so not a bug.  Please file a new ticket if you request a feature change."

@sawa I know you can write English better than I.  Please do not use Japanese in an English ticket.

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Bug #15708: Implicit numbered argument decomposes an array
https://bugs.ruby-lang.org/issues/15708#change-78952

* Author: sawa (Tsuyoshi Sawada)
* Status: Rejected
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
* ruby -v: 2.7.0dev
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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In the following, `@1` refers to the entire item iterated:

```ruby
a = [1, 2, 3]
a.map{|x| x} # => [1, 2, 3]
a.map{@1} # => [1, 2, 3]
```

whereas in the following, `@1` refers to the first item achieved by decomposing the item iterated, behaving the same as `x` given by `|(x)|` rather than by `|x|`:

```ruby
a = [[1], [2], [3]]
a.map{|x| x} # => [[1], [2], [3]]
a.map{|(x)| x} # => [1, 2, 3]
a.map{@1} # => [1, 2, 3]
```

Is this intended?

---Files--------------------------------
single-implicit-arg-no-destructure.diff (471 Bytes)


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