Re: DIP65: Fixing Exception Handling Syntax

[Timon Gehr via Digitalmars-d]

On 07/28/2014 10:23 PM, Brian Schott wrote:
On Monday, 28 July 2014 at 20:14:24 UTC, Timon Gehr wrote:
foreach(i;0..n){
    // ...
}
(&x).foo();
try{
   // ...
}catch(Exception e){
    return e;
}
(new Exception("hi")).msg.writeln;

I don't see how these are ambiguous.

Both are ambiguous for the same reason. They are ambiguous because there 
exist delegate/function literals of the form

enum e={ return 2; }();
       ^~~~~~~~~~~~~
       an expression

The following program demonstrates how to disambiguate the code such 
that it is parsed in the alternative way:

import std.stdio;

void bar(){
    foreach(x;0..10)(){
        // ...
    }
    (&x).foo();
}

void main(){
    Exception e(){
        try{
            // ...
            throw new Exception("foo");
        }catch delegate(Exception e){
            return e;
        }(new Exception("hi")).msg.writeln;

        return null;
    }
    e();
}