How do you debug @safe @nogc code? Can't figure out how to print.

[aliak]

On Saturday, 17 November 2018 at 13:43:20 UTC, Stanislav Blinov 
wrote:
> On Saturday, 17 November 2018 at 13:13:36 UTC, aliak wrote:
>
>> Sawweet! Thanks, that made the printing possible!
>
> You're welcome ;) Still, try a more recent compiler. This works 
> fine:
>
> void foo() @nogc {
>     debug {
>         import std.stdio;
>         writefln("%d", 42);
>     }
> }

Yeah that does, but not the code I posted -> 
https://run.dlang.io/is/vH3cFa

You can use "debug blah" to hide inside functions that are 
attributed, but when you have an attributed function that calls a 
template, attribtues of which are supposed to be inferred, it 
seems to fail.

Maybe a bug if it's supposed to work?

>
>> "scope" is const from what I understand right? It works 
>> without scope as well. So just "return T".
>
> No, "scope" means "does not escape scope", i.e. you can't 
> assign that argument to some global. The only exception is 
> through a return, in which case "return" also needed. Whether 
> or not just "return" is sufficient, is a bit out there still 
> (AFAIK), between DIP25, DIP1000 and current state of the 
> language.
> "scope" was implemented for delegates for ages now, exactly to 
> allow passing lambdas around without allocating their context 
> on the GC heap.

Aha, cool. Thanks!