C#: Fix global statement extraction #9610
Merged
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This PR fixes global statement extraction. Previously the implicit main method was extracted first, and then its body and statements were extracted independently. However, the statement extraction requires to be run in a method extraction context because it expects the tag stack to contain the current method. This PR fixes this by extracting the global statements as if they appeared inside the implicit main method.
The first commit in this PR shows that there was an extraction error before the fix in the second commit is applied.
This issue was reported recently in #9536.