[Version 10.0] Feature support for CallerArgumentExpression attribute #1535
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This is Rex's adaptation of the corresponding MS proposal.
FYI, during testing, I discovered a feature that is not documented in the MS proposal: Not only is leading and trailing whitespace removed from an argument, but so too are any outermost grouping parens, with these two removal processes done repeatedly, as necessary, so an argument token set of
( ( (123) + 0) )is reduced to(123) + 0.