Fix inheritance bug that doesn't reset state correctly #49
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What?
This addresses a bug with a very specific set of criteria for
reproduction:
a block (nothing needs to be declared in the block)
macro named (X)
macro named (X)
The bug that triggered this failure (a duplicate element declaration
error, which would be on (X) in the example above) was related to a
state change (setting nested_macro to true) when a block is provided to
a macro that wasn't reset after the block was complete.
When a class inherits from PageEz or its subclasses, if it's not nested,
it resets all its visitors. This key behavior wasn't being triggered on
(C), resulting in it finding the same macro (X) from (B) and determining
that it was a collision.