samples: add Terra samples

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

samples/Terra/interface.t

@@ -0,0 +1,33 @@
+
+IO = terralib.includec("stdio.h")
+local Class = require("lib/javalike")
+
+struct A {
+	a : int
+}
+
+terra A:foo(a : int) : int
+	return self.a + a
+end
+
+local m = A.methods.foo:getdefinitions()[1]
+
+HasFoo = Class.interface({ foo = int -> int })
+
+Class.implements(A,HasFoo)
+
+terra hasfoo(a : &HasFoo)
+	return a:foo(3)
+end
+
+terra testit()
+	var a = A.alloc()
+	a.a = 4
+	return hasfoo(a) + a:foo(5)
+end
+
+print(m:getpointer())
+testit:compile()
+print("DONE")
+
+assert(testit() == 16)