Accept trailing comma in cfg_attr
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@@ -90,6 +90,7 @@ impl<'a> StripUnconfigured<'a> {
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parser.expect(&token::Comma)?;
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let lo = parser.span.lo();
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let (path, tokens) = parser.parse_meta_item_unrestricted()?;
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parser.eat(&token::Comma); // Optional trailing comma
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parser.expect(&token::CloseDelim(token::Paren))?;
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Ok((cfg, path, tokens, parser.prev_span.with_lo(lo)))
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}) {
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