AutoGen: 3.4.14 for-index - get current loop index

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### 3.4.14 ``for-index'` - get current loop index

Usage: (for-index [ for_var ])
Returns the current index for the named FOR loop. If not named, then the index for the innermost loop. Outside of any FOR loop, it returns SCM_UNDEFINED. See section FOR - Emit a template block multiple times.

Arguments:
for_var - Optional - which for loop

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