libsyntax: Workaround pprust for issue
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@ -156,7 +156,7 @@ pub fn expand_expr(e: @ast::Expr, fld: &mut MacroExpander) -> @ast::Expr {
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// }
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// }
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let local_ident = token::gensym_ident("i");
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let local_ident = token::gensym_ident("__i"); // FIXME #13573
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let next_ident = fld.cx.ident_of("next");
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let none_ident = fld.cx.ident_of("None");
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