while(...){ ... }else ...

[deadalnix via Digitalmars-d]

On Sunday, 18 January 2015 at 18:16:47 UTC, Marc Schütz wrote:
> Unfortunately, this would break existing code:
>
>     if(some_condition)
>         while(some_other_condition) {
>             // ...
>         }
>     else
>         // ...
>
> Currently, the `else` branch belongs to the `if`; with your 
> proposal, it would belong to the `while`.
>
> An `else` always attaches to the closest construct where it can 
> be accepted; AFAICS, this cannot be changed without making the 
> language grammar context-sensitive (it would require parsing 
> `while` inside an `if` differently from other `while`s).

Compiler have simplification of CFG passes that makes this 
feature irrelevant in practice.