Macro blocks bleed scope

[Blacksmoke16]

Normally block arguments are scoped to the block itself. For example:

v = nil

{1, 2, 3}.each { |v| }

pp v # => nil

However macro blocks do not seem to have the same behavior. This can lead to hard to debug bugs if the block param name happens to match a variable outside of the block.

{%
  v = nil

  {1, 2, 3}.each { |v| }

  v # => 3
%}

[HertzDevil]

Duplicate of #11140