Nested with __pragma__(...)
#692
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Keeping on working for #552
In this changeset I've implemented stack for flags set and reset by pragmas. This allows us to solve
with __pragma__nesting problem.There is also
__pragma__('push')and__pragma__('pop')for saving and restoring flag state from stack. I plan to use those to fix the same nesting problem for single-line activated pragmas.Aliases cannot be nested yet.
The tests is a bit lacking. I think, snapshot testing could be better soultion for testing pragmas.