[erlang-questions] why isn't scope in "begin end" block？

[Dao Gui]

Sorry to my pool English
Example:

-module(test).
-export([test/0]).

test() ->
    begin A = 1 end,
    A = 2. %% match error
    %io:format("~p~n", [A]). %normal output

The var A is in begin end scope, but it can visited by other scope.
Why isn't erlang support this?

no this feature， I can't write the next code:
-define(OUTPUT_3(A), begin [_,_,B|_]=A, io:format("~p~n", [B]) end).
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