From: Jean Privat <jean@pryen.org>
Date: Mon, 16 Sep 2019 14:34:31 +0000 (-0400)
Subject: Merge: Callref types
X-Git-Url: http://nitlanguage.org

Merge: Callref types

Extended the functional type hierarchy to include RoutineRef type (aka function pointer).
Added type resolution on callref expression :

```
import functional
fun toto(x: Int) do print x
var x = &toto
assert x isa ProcRef1[Int]
```

Pull-Request: #2791
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