How can I check to see if template type is an array?

[Tim]

On Tuesday, 19 January 2021 at 22:31:47 UTC, Paul Backus wrote:
> You've almost got it. The correct syntax is `is(T == U[], U)`. 
> You can read it as "there exists some type U such that T == 
> U[]".

Thanks! Do I need to specify U in the template function?