[ruby-dev:52150] [Ruby master Bug#21138] The modifier expression with "it" is parsed differently in parse.y and Prism, which is unexpected in both.

[ruby-dev:52150] [Ruby master Bug#21138] The modifier expression with "it" is parsed differently in parse.y and Prism, which is unexpected in both.

[kinoppyd (Yasuhiro Kinoshita) via ruby-dev]

Issue #21138 has been reported by kinoppyd (Yasuhiro Kinoshita).

----------------------------------------
Bug #21138: The modifier expression with "it" is parsed differently in parse.y and Prism, which is unexpected in both.
https://bugs.ruby-lang.org/issues/21138

* Author: kinoppyd (Yasuhiro Kinoshita)
* Status: Open
* ruby -v: ruby 3.4.1 (2024-12-25 revision 48d4efcb85) [arm64-darwin21]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
## Actual

### parse.y

In parse.y, the block parameter "it" behaves as if it is not assigned.

```ruby
# parse.y
loop.rb:1:in 'block in <main>': undefined method '<' for nil (NoMethodError)

1.then { it *= 10 while it < 1000 }
                           ^
	from <internal:kernel>:126:in 'Kernel#then'
	from loop.rb:1:in '<main>'
```

### prism

In Prism, I may not understand what's happening due to my limited knowledge, but it results in a syntax error."

```ruby
unexpected integer; expected an expression after the operator
unexpected integer, expecting end-of-input

> 1  1.then { it *= 10 while it < 1000 }

loop.rb:1: syntax errors found (SyntaxError)
> 1 | 1.then { it *= 10 while it < 1000 }
    |             ^~ unexpected integer; expected an expression after the operator
    |                ^~ unexpected integer, expecting end-of-input
```

## Expected

'It' should be reassigned until it is greater than 1000.



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[ruby-dev:52151] [Ruby master Bug#21138] The modifier expression with "it" is parsed differently in parse.y and Prism, which is unexpected in both.

[nobu (Nobuyoshi Nakada) via ruby-dev]

Issue #21138 has been updated by nobu (Nobuyoshi Nakada).

Assignee set to prism

`it` is interpreted as an ordinary local variable, if there is the assignment, including operator-assign.

The shortened example is:
```ruby
1.then { it = 1 }
```
The block should be called once and assign 1 to a local variable `it`.
This works as expected with both of parse.y and prism.

However, with the op-assign:
```ruby
1.then { it *= 1 }
```

parse.y parses the example as well as the previous example
(but cannot run `it` is not assigned and is `nil`, and raises `NoMethodError` on `NilClass#*`).

Prism seems to parse the simple assignment to `it` properly, but not op-assign.

----------------------------------------
Bug #21138: The modifier expression with "it" is parsed differently in parse.y and Prism, which is unexpected in both.
https://bugs.ruby-lang.org/issues/21138#change-111953

* Author: kinoppyd (Yasuhiro Kinoshita)
* Status: Open
* Assignee: prism
* ruby -v: ruby 3.4.1 (2024-12-25 revision 48d4efcb85) [arm64-darwin21]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
## Actual

### parse.y

In parse.y, the block parameter "it" behaves as if it is not assigned.

```ruby
# parse.y
loop.rb:1:in 'block in <main>': undefined method '<' for nil (NoMethodError)

1.then { it *= 10 while it < 1000 }
                           ^
	from <internal:kernel>:126:in 'Kernel#then'
	from loop.rb:1:in '<main>'
```

### prism

In Prism, I may not understand what's happening due to my limited knowledge, but it results in a syntax error."

```ruby
unexpected integer; expected an expression after the operator
unexpected integer, expecting end-of-input

> 1  1.then { it *= 10 while it < 1000 }

loop.rb:1: syntax errors found (SyntaxError)
> 1 | 1.then { it *= 10 while it < 1000 }
    |             ^~ unexpected integer; expected an expression after the operator
    |                ^~ unexpected integer, expecting end-of-input
```

## Expected

'It' should be reassigned until it is greater than 1000.



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[ruby-dev:52152] [Ruby master Bug#21138] The modifier expression with "it" is parsed differently in parse.y and Prism, which is unexpected in both.

[nobu (Nobuyoshi Nakada) via ruby-dev]

Issue #21138 has been updated by nobu (Nobuyoshi Nakada).


nobu (Nobuyoshi Nakada) wrote in #note-1:
> parse.y parses the example as well as the previous example
> (but cannot run `it` is not assigned and is `nil`, and raises `NoMethodError` on `NilClass#*`).

This error is what occurs from `it < 1000` in the your example.

----------------------------------------
Bug #21138: The modifier expression with "it" is parsed differently in parse.y and Prism, which is unexpected in both.
https://bugs.ruby-lang.org/issues/21138#change-111957

* Author: kinoppyd (Yasuhiro Kinoshita)
* Status: Open
* Assignee: prism
* ruby -v: ruby 3.4.1 (2024-12-25 revision 48d4efcb85) [arm64-darwin21]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
## Actual

### parse.y

In parse.y, the block parameter "it" behaves as if it is not assigned.

```ruby
# parse.y
loop.rb:1:in 'block in <main>': undefined method '<' for nil (NoMethodError)

1.then { it *= 10 while it < 1000 }
                           ^
	from <internal:kernel>:126:in 'Kernel#then'
	from loop.rb:1:in '<main>'
```

### prism

In Prism, I may not understand what's happening due to my limited knowledge, but it results in a syntax error."

```ruby
unexpected integer; expected an expression after the operator
unexpected integer, expecting end-of-input

> 1  1.then { it *= 10 while it < 1000 }

loop.rb:1: syntax errors found (SyntaxError)
> 1 | 1.then { it *= 10 while it < 1000 }
    |             ^~ unexpected integer; expected an expression after the operator
    |                ^~ unexpected integer, expecting end-of-input
```

## Expected

'It' should be reassigned until it is greater than 1000.



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