Don't actually use the attached tokens for now

This fails to bootstrap, since we completely ignore `#[cfg]` and other
attributes/macros

Author: Aaron1011

src/librustc_parse/lib.rs

@@ -321,12 +321,13 @@ pub fn nt_to_tokenstream(nt: &Nonterminal, sess: &ParseSess, span: Span) -> Toke
             Some(tokenstream::TokenTree::token(token::Lifetime(ident.name), ident.span).into())
         }
         Nonterminal::NtTT(ref tt) => Some(tt.clone().into()),
-        Nonterminal::NtLiteral(ref expr) | Nonterminal::NtExpr(ref expr) => expr.tokens.clone(),
+        _ => None
+        /*Nonterminal::NtLiteral(ref expr) | Nonterminal::NtExpr(ref expr) => expr.tokens.clone(),
         Nonterminal::NtTy(ref ty) => ty.tokens.clone(),
         Nonterminal::NtBlock(ref block) => block.tokens.clone(),
         Nonterminal::NtPat(ref pat) => pat.tokens.clone(),
         Nonterminal::NtStmt(ref stmt) => stmt.tokens.clone(),
-        Nonterminal::NtMeta(_) | Nonterminal::NtPath(_) | Nonterminal::NtVis(_) => None,
+        Nonterminal::NtMeta(_) | Nonterminal::NtPath(_) | Nonterminal::NtVis(_) => None,*/
     };
 
     // FIXME(#43081): Avoid this pretty-print + reparse hack