Support BEGIN blocks - #486
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`BEGIN { ... }` raised "not supported yet: pre_execution_node" and
aborted the whole run, unlike `END { ... }`, which was already
supported. BEGIN now shares its implementation with END but is installed
before the surrounding statements instead of after, so a method or a
local variable it defines reaches the statements that follow.
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Motivation / Background
This Pull Request has been created because a file containing a
BEGIN { ... }block aborts the whole run:The raise happens while building the AST, so one such file stops the analysis of every other file as well. ruby/ruby has one in
sample/trick2025/02-mame/entry.rb.END { ... }has been supported all along.Detail
BEGIN is installed before the surrounding statements instead of after, unlike END, so a method or a local variable it defines is visible to the statements that follow.
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