closures + struct: Error: forward reference to inferred return type of function call

[ddcovery]

On Monday, 14 December 2020 at 12:22:26 UTC, ddcovery wrote:
>     int opCmp(Number other){
>       return _value - other.value;
>     };
Correction:

bool opEquals(Number other){
   return _value == other.value;
};