Why writeln can't be converted to nothrow with just catching of StdioException

[partypooper]

On Monday, 21 February 2022 at 11:21:52 UTC, Mike Parker wrote:
> On Monday, 21 February 2022 at 11:07:55 UTC, Basile B. wrote:
>> [...]
>
> This has nothing to do with which exceptions types a function 
> throws. The compiler doesn't dig into that. You have to catch 
> `Exception`.
>
> ```D
> import std.stdio;
>
> class MyException : Exception {
>     this(string msg) { super(msg); }
> }
>
> void throwing(int x) {
>     if(x > 2) throw new MyException("Derp!");
>     else writeln(x);
> }
>
> void noThrowing() nothrow {
>     try {
>         throwing(10);
>     }
>     catch(MyException me) {}
> }
>
> void main()
> {
>     noThrowing();
> }
> ```
>
> ```
> onlineapp.d(14): Error: function `onlineapp.throwing` is not 
> `nothrow`
> onlineapp.d(12): Error: `nothrow` function 
> `onlineapp.noThrowing` may throw
> ```

Thank You for detailed explanation.