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When compiling alternative syntax blocks, such as `for ...: endfor`,
`if ...: endif` etc., the compiler didn't assign the contained statements
to a dedicated lexical scope, which caused a stack mismatch between
compiler and vm when such blocks declaring local variables weren't
actually executed.
-- Expect stdout --
2
-- End --
-- Testcase --
{%
if (false):
let a = 1;
endif;
/* Due to lack of own lexical scope above, the compiler assumed
* that `a` is still on stack but the code to initialize it was
* never executed, so stack offsets were shifted by one from here
* on throughout the rest of the program. */
let b = 2;
print(b, "\n");
%}
-- End --
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