range.put() to Empty Array Causes Error?

[Steven Schveighoffer]

On 6/17/18 7:07 AM, Vijay Nayar wrote:
> This code breaks with the following error:
> void main()
> {
>      import std.range;
>        int[] vals = [];
>      vals.put(3);
> }
> /src/phobos/std/range/primitives.d(2328): Attempting to fetch the front 
> of an empty array of int
> 
> The following code has no error:
> void main()
> {
>      import std.range;
>        int[] vals = [1];
>      vals.put(3);
> }
> 
> Why is range.put() not allowed for empty arrays?
> 
> 

range.put fills an existing array like a buffer, it does not append (as 
I'm guessing you are expecting). Use std.array.Appender to get append 
behavior.

BTW, use put(vals, 3) instead of vals.put(3), as you may bypass the 
features of put.

-Steve