Issue #13074 has been updated by Hiroyuki Ishii.

Subject changed from When execute instance_exec with symbol.to_proc, it ignores first argument. to When executing instance_exec with symbol.to_proc, it ignores first argument.

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Bug #13074: When executing instance_exec with symbol.to_proc, it ignores first argument.
https://bugs.ruby-lang.org/issues/13074#change-62245

* Author: Hiroyuki Ishii
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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Is this intentional?

```
# Ruby 2.3.3
 instance_exec(1) { |i| i.itself }
=> 1
 instance_exec(1, &:itself)
=> 1

# Ruby 2.4.0
 instance_exec(1) { |i| i.itself }
=> 1
 instance_exec(1, &:itself)
=> main
```



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