@nogc

[bearophile via Digitalmars-d]

Walter Bright:

> I've thought of allowing "throw new ...", and yours would be in 
> addition to that, in @nogc functions, but was waiting to see 
> how this would play out a bit first.

It's true that currently significant parts of Phobos can't be 
@nogc, but the solution is not to turn @nogc into its opposite.


See:
https://d.puremagic.com/issues/show_bug.cgi?id=12768


With a comment by monarchdodra:

>>         static err = new immutable(RangeError)();
> 
> I'm surprised this works. If the exception is Immutable,
> then how can we chain it? If we catch "Exception", then
> we are making something immutable mutable. If we mutate
> the exception, then not only do we break the type system,
> but it also means the code isn't actually pure:
> 
> //----
> void foo() pure
> {
>     static err = new immutable(RangeError)("error");
>     throw err;
> }
> 
> void main()
> {
>     try
>     foo();
>     catch(Error e)
>     {
>         e.msg = "yo!";
>     }
> 
>     foo(); //core.exception.RangeError at main.d(7): yo!
> }

Bye,
bearophile