add a warning/error when a for-in loop range is empty

[rilaaax]

Describe the feature

When using an empty range with int literals in a for-in loop, I think we should add en error or at least a warning.

fn main() {
	for i in 4 .. 2 {
		println(i) // unreachable
	}
}

Use Case

Avoid unreachable code

Proposed Solution

Simple update of the for checker

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

Version used

0.5.1

Environment details (OS name and version, etc.)

not relevant

Note

You can use the 👍 reaction to increase the issue's priority for developers.

Please note that only the 👍 reaction to the issue itself counts as a vote.
Other reactions and those to comments will not be taken into account.