samples: add Terra samples

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

samples/Terra/method.t

@@ -0,0 +1,42 @@
+--the zero line
+struct A { b : B } and
+struct B {a : int, b : int}
+
+B.methods.foo = terra(b : B)
+    return b.a
+end
+terra bar()
+    var b = B { 1,2 }
+    return b:foo()
+end
+
+
+B.methods.foo2 = terra(b : &B)
+    b.a = 6
+end
+
+terra bar2()
+    var b = B { 1,2 }
+    b:foo2()
+    return b.a
+end
+
+B.methods.foo3 = terra(b : B)
+    return b.a
+end
+
+terra bar3()
+    var b = B { 1,2 }
+    return (&b):foo3()
+end
+terra bar4()
+    var b = B { 1,2 }
+    (&b):foo2()
+    return b.a
+end
+
+test = require("test")
+test.eq(bar(),1)
+test.eq(bar2(),6)
+test.eq(bar3(),1)
+test.eq(bar4(),6)