pprust: Do not convert attributes into MetaItems for printing

Fixes #62628

Author: petrochenkov

src/libsyntax/print/pprust.rs

@@ -617,21 +617,17 @@ pub trait PrintState<'a>: std::ops::Deref<Target=pp::Printer> + std::ops::DerefM
                 ast::AttrStyle::Outer => self.word("#["),
             }
             self.ibox(0);
-            if let Some(mi) = attr.meta() {
-                self.print_meta_item(&mi);
-            } else {
-                match attr.tokens.trees().next() {
-                    Some(TokenTree::Delimited(_, delim, tts)) => {
-                        self.print_mac_common(
-                            Some(&attr.path), false, None, delim, tts, true, attr.span
-                        );
-                    }
-                    tree => {
-                        self.print_path(&attr.path, false, 0);
-                        if tree.is_some() {
-                            self.space();
-                            self.print_tts(attr.tokens.clone(), true);
-                        }
+            match attr.tokens.trees().next() {
+                Some(TokenTree::Delimited(_, delim, tts)) => {
+                    self.print_mac_common(
+                        Some(&attr.path), false, None, delim, tts, true, attr.span
+                    );
+                }
+                tree => {
+                    self.print_path(&attr.path, false, 0);
+                    if tree.is_some() {
+                        self.space();
+                        self.print_tts(attr.tokens.clone(), true);
                     }
                 }
             }

src/test/pretty/attr-literals.rs

@@ -5,10 +5,10 @@
 #![feature(rustc_attrs)]
 
 fn main() {
-    #![rustc_dummy("hi", 1, 2, 1.012, pi = 3.14, bye, name("John"))]
+    #![rustc_dummy("hi" , 1 , 2 , 1.012 , pi = 3.14 , bye , name ("John"))]
     #[rustc_dummy = 8]
     fn f() { }
 
-    #[rustc_dummy(1, 2, 3)]
+    #[rustc_dummy(1 , 2 , 3)]
     fn g() { }
 }

src/test/pretty/attr-tokens-raw-ident.rs

@@ -0,0 +1,7 @@
+// Keywords in attribute paths are printed as raw idents,
+// but keywords in attribute arguments are not.
+
+// pp-exact
+
+#[rustfmt::r#final(final)]
+fn main() { }