Recommendations on avoiding range pipeline type hell

[SealabJaster]

On Sunday, 16 May 2021 at 20:32:08 UTC, SealabJaster wrote:
> ...

You could even make a helper function that lets the compiler 
infer the lambda's type for you:

```d
struct S(T)
{
    alias FT = T function(T);
    FT func;
}

S!T s(T)(T function(T) func)
{
     return S!T(func);
}

void main()
{
     auto a = S!int(a => a*2);
     auto b = s((int a) => a+2);
     a = b;
}
```

But that can give you awful looking error messages if you forget 
to add the param typing.