Use LangVersion=8 where feasible in testing #1217
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This should allow us to avoid accidentally using C# 9+ features, at least in most cases. The standalone-console and standalone-console-without-using templates are unchanged, as many examples using them expect to use top-level statements. (Once we've got as far as C# 10, we should be able to use LangVersion for all projects.)
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Note that now both MaybeNull1Attribute and MaybeNull2Attribute fail to build - I believe this is correct, and should be reflected in spec changes which you may be doing already. Happy to wait until you're done, then rebase this.