Fix #22: This should make looping over temporaries work #58
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This block creates a C++ scope and tracks given variables within tmpl_seq. Use it like: helper_scope_block().use([ array of variables ]) When ending its use (which has to be performed manually) just do the stack.pop(-1).on_end(), which deregisters all variables from tmpl_seq.
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This implements the solution proposed in #22 but with the new insight about double parens.
I also added a
helper_scope_blockin the tmpl_cc which is used by the foreach block to scope the variable closely to the for loop.