[ruby-core:102665] [Ruby master Bug#15932] wrong "void value expression" error for 'next' or 'break' statements inside an 'if' assignment

Issue #15932 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.4: REQUIRED, 2.5: REQUIRED, 2.6: REQUIRED to 2.4: REQUIRED, 2.5: DONE, 2.6: REQUIRED

Backported into ruby_2_6 at r67903.

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Bug #15932: wrong "void value expression" error for 'next' or 'break' statements inside an 'if' assignment
https://bugs.ruby-lang.org/issues/15932#change-90659

* Author: cvss (Kirill Vechera)
* Status: Closed
* Priority: Normal
* ruby -v: 1.8.7, 2.7.0preview1
* Backport: 2.4: REQUIRED, 2.5: DONE, 2.6: REQUIRED
----------------------------------------
When a 'next' or 'break' statement for block/loop control is placed inside an 'if' assignment, the parser outputs an error "void value expression". The same parsing error raises for the ternary operator in the same conditions.

I think, the the correct behavior should be consistent with the behavior of the 'case' statement, that is parsing such a code without errors and leaving the right-side variable with 'nil' value.

Examples of code giving a "void value expression" error:

1.

```
begin
	a = if false
		'A'
	else
		next
	end
end while false
```

2.
```
begin
	a = false ? 'A' : next
end while false
```

Example of code running without errors:

3.
```
begin
	a = case false
		when true
			'A'
		else
			next
		end
end while false
```

4.
```
begin
	a = (false or next)
end while false
```




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