Example of the perils of binding rvalues to const ref

[Kagamin via Digitalmars-d]

On Tuesday, 16 September 2014 at 15:30:49 UTC, Andrei 
Alexandrescu wrote:
> The function get_url() returns an rvalue, which in turn gets 
> bound to a reference to const and implicitly passed to 
> string_view's constructor. The obtained view refers to a dead 
> string.

When I saw this idiom used in D, I asked the same question: how 
long the temporary should survive? Does it work more reliably in 
D? It would be ok if it survives till the end of the scope, 
optimization opportunities lost this way should be small enough.