samples: add Terra samples

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

samples/Terra/coverage.t

@@ -0,0 +1,47 @@
+function failit(match,fn)
+	local success,msg = pcall(fn)
+	if success then
+		error("failed to fail.",2)
+	elseif not string.match(msg,match) then
+		error("failed wrong: "..msg,2)
+	end
+end
+local test = require("test")
+local erd = "Errors reported during"
+
+local terra f1()
+	return test
+end
+
+failit(erd,function()
+f1:compile()
+end)
+failit("referencing a function which failed to compile",function()
+f1:compile()
+end)
+failit(erd,function()
+	local terra foo()
+		f1()
+	end
+	foo()
+end)
+
+
+local struct A {
+	a : int
+}
+
+A.metamethods.__getentries = function(self)
+	error("I AM BAD")
+end
+
+failit(erd,function()
+	A:complete()
+end)
+
+failit(erd,function()
+	local terra foo()
+		var a : A
+	end
+	foo()
+end)