samples: add Terra samples

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

samples/Terra/parsefail.t

@@ -0,0 +1,35 @@
+
+local self = 1
+local Rt = 1
+local i = 1
+local j = 1
+terra bar()
+var a = Rt.MatrixDouble{[&double](self.ptr) , i,j}
+end
+
+local r,e = terralib.loadstring[[
+	
+	terra foo()
+		var a = { [&double](4) = 3 }
+	end
+]]
+
+assert(r == nil and e:match("unexpected symbol near '='"))
+
+terra foo()
+	var a = { [""] = 3 }
+end
+
+local s = symbol()
+
+local function getsym()
+	return s
+end
+terra foo2()
+	var [getsym()] = 3
+	var a = { [getsym()] = 4, _1 = [getsym()] }
+	return a.[getsym()] + a._1
+end
+
+assert(7 == foo2())
+