Hello,
I have a viewtype and I am using it in a call-by-value function. I want to
temporarily assign it to a variable for use in a template that uses
call-by-reference.
Is there a way to assert that the variable has not been consumed?
Right now I am doing this, which typechecks and compiles in my case:
extern fun {env}
some_template( env : &env >> _ ) : void
fun f ( x: !VT) : void =
let
var env = x
val _ = some_template<VT>(env)
prval () = $effmask_all(
x := env
)
in
end
Is this expected behavior? Is it possible to write a proof function that
can restore "x"?
( Ultimately, x does not change, and the semantics of call-by-value seem
best for this function ).
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