samples: add Terra samples

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

samples/Terra/canon.t

@@ -0,0 +1,45 @@
+
+struct B {
+   a : A
+} and
+struct A {
+   b : &B
+}
+
+
+
+
+struct C {
+    i : int
+}
+local U = struct { c : C }
+local UP = &U
+
+
+local FP = UP -> int
+local FP2 = UP -> int
+
+local FI = int -> int
+local FI2 = int -> int
+terra anon()
+    var b : B
+    b.a.b = &b
+    return 4
+end
+
+terra anon2()
+    var u = U { C {3} }
+    
+    var fp : FP, fi : FI
+    var fi2 : FI2 = fi
+    var fp2 : FP2 = fp
+    var up : UP = &u
+    return up.c.i
+end
+
+
+
+test = require("test")
+
+test.eq(anon(),4)
+test.eq(anon2(),3)