When a template was parsed with global block left stripping disabled,
then any text preceding an expression or statement block start tag was
incorrectly prepended to the first token value of the block, leading
to syntax errors in the compiler.

-- Testcase --
{% for (let x in [1, 2, 3]): %}
{{ x }}
{% endfor %}
-- End --

-- Args --
-Tno-lstrip
-- End --

-- Expect stdout --
1
2
3
-- End --