Multi-assignment

[arakov]

For ELENA 6.0 I'm implementing a multi value support - see #508

I'm thinking about the following possible syntax for this:

a,b := (2,"string");

or

a,&b := (2,"string");

where & symbol indicates multi-assignment to tell apart from simple multi variable declaration (not yet supported)

Then the method multi-return will look like this

int, string getPair()
    = (2, "string");

or

int, &string getPair()
    = (2, "string");

The problem with the first syntax that it will be a big ambiguous for nested declaration like

 o.doSomething(a,b := (2, "string"))

But of course it is possible to provide an extra syntax to unbox tuple. Something like this:

 o.doSomething($(2, "string"))

Any ideas and suggestions are welcomed.

P.S. of course always exist the way to support more C# style like

(a,b) := (2, "string")

but I really don't like this syntax. In my opinion it is a bit less clear

[arakov]

So the final solution will be the following:

singleton Tester
{
   int,string get()   // multi-value will be introduced with a simple comma
   {
      ^ (1,"abc")
   }
}

public program()
{
   var a, b := Tester.get();       // similar for unboxing, several variables separated by a comma and with assignment part.
   console.printLine("t.Item1 aka a=",a, ",t.Item2 aka b=", b);
}