break while; break for; break foreach

[Steven Schveighoffer]

On 5/13/21 3:16 PM, Walter Bright wrote:
> It's an interesting idea.
> 
> One of the downsides is when refactoring code, the "break while" may 
> suddenly apply to an unintended while. With "break label" that isn't 
> going to happen.

True. But this also happens with a non-labeled break statement. But we 
may not want to duplicate that pain with a new feature.

Possibly, we could require labels if the target is ambiguous (i.e. 
`break while` in a `while` nested in a `while`).

For sure, the most common use case I think is a switch inside a loop or 
a loop inside a switch, which should be pretty unambiguous.

-Steve