Testing statement blocks.

-- Expect stdout --
The result of 3 * 7 is 21.
A statement block may contain multiple statements: Hello World
To escape the start tag, output it as string expression: {%
Alternatively print it: {%
-- End --

-- Testcase --
The result of 3 * 7 is {%+ print(3 * 7) %}.
A statement block may contain multiple statements: {%+
	print("Hello ");
	print("World");
%}

To escape the start tag, output it as string expression: {{ "{%" }}
Alternatively print it: {%+ print("{%") %}

-- End --