Re: Choosing between __traits(compiles, { ... } ) and is(typeof( { ... } ))

[Stefan Koch via Digitalmars-d-learn]

On Wednesday, 20 September 2017 at 12:01:21 UTC, Nordlöw wrote:
When is
    __traits(compiles, { ... } )

preferred over

    is(typeof( { ... } ))

and vice versa when writing stuff like

    enum isCopyable(S) = is(typeof( { S foo = S.init; S copy = 
foo; } ));

?

Further, are there cases where the two idioms aren't 
exchangable?

Yes there are.
Prefer __traits(compiles) it includes stricter visibility checks 
then is() does.
Also compiles does not require the expression to resolve to a 
type.