New Rule Suggestion: unreachable code,

Normally, anything after a break or return is unreachable code.

However, it's also possible to have a label after a break, but if you make a mistake typing it, then it's just treated as "anything after a break" and therefore doesn't cause an error.

For example, see this example code full of problems:

:first foreach($i in 0..10) {
    $i *= 10
    Write-Verbose "Imagine we did stuff with $i"
    :mid foreach($j in 0..9) {
        Write-Verbose "Imagine we did stuff with $($i+$j)"
        :inner foreach($k in 0..9) {
            Write-Verbose "Imagine we did stuff with $($i+$j).$k"

            if($k -eq $j) {
                Write-Warning "Peaked at $($i+$j).$k"
                break :mid  # common mistake, will cause no error, acts like a break with no label
                this code is unreachable
            }

           if($k -gt $i) {
                Write-Warning "Ended at $($i+$j).$k"
                break top # uncommon mistake, also no error, breaks out of all loops
           }
       }
    }
}

return

Since this code never runs...
You could write anything that parses like a command and get no errors.

So, my suggestion:

First of all, flag unreachable code.

If there's code after a break or continue or return ... that merits a warning (or information, or something).

Most importantly, flag possible bad labels.

Any time break is followed on the same line by something that is not a comment ... that something should match the name of one of the labels, sans-punctuation.of any sort.

It's possible you could write break top without a corresponding :top label, but it's a bad idea.

Other than that, there's no valid reason why someone would exploit the inconsistency of the language parser here and use punctuation or something like break -this is a comment ...

This should be an error I think, because it's almost guaranteed to be a mistake.

使用 issue 中的 PowerShell 示例作为行为案例：应报告 break、continue 或 return 之后的不可达语句，并根据已声明的标签验证 break 之后的标签。检查 analyzer 现有的规则入口点和测试，以确定控制流和标签处理应归属于何处；当两种错误模式都能在没有误报的情况下产生预期诊断时，即表示完成。