samples: add Terra samples

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

samples/Terra/luaterramethod.t

@@ -0,0 +1,40 @@
+
+
+struct Foo {
+    a : int;
+    b : int;
+}
+
+terra Foo:bar()
+    self.a = self.a + 1
+    return self.a + self.b
+end
+
+Foo.methods.baz = function(self) print(self.a,self.b) end
+Foo.methods.mac = macro(function() return `1 end)
+
+terra usemethod()
+    var a = Foo { 3, 4}
+    a:baz()
+    return a:bar()
+end
+assert(8 == usemethod())
+
+obj = terralib.new(Foo[1], {{3,4}})
+
+assert(8 == obj[0]:bar())
+assert(9 == obj[0]:bar())
+obj[0]:baz()
+
+local a,b = pcall(function()
+obj[0]:mac()
+end)
+assert(not a)
+assert(string.match(b,"not supported"))
+
+local a,b = pcall(function()
+obj[0]:maz()
+end)
+
+assert(not a)
+assert(string.match(b,"attempt to call method"))