samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/unpacktuple.t

@@ -0,0 +1,30 @@
+
+
+terra foo()
+ return 1,2
+end
+
+terra foo2()
+ return {a = 1, b = 2}
+end
+
+assert(unpacktuple(1) == 1)
+assert(unpacktuple(foo()) == 1)
+
+assert(unpacktuple(foo(),2) == 2)
+
+assert(unpacktuple(foo(),nil,1) == 1)
+assert(unpacktuple(foo2()).a == 1)
+
+assert(2 == #{unpacktuple(foo())})
+
+assert(1 == #{unpacktuple(foo(),2)})
+
+terra usefoo()
+    var a = foo()
+    var c,d = unpacktuple(a)
+    var e = unpacktuple(a,2)
+    return e
+end
+
+assert(usefoo() == 2)