Rename ast::TokenKind::Not as ast::TokenKind::Bang.

For consistency with `rustc_lexer::TokenKind::Bang`, and because other
`ast::TokenKind` variants generally have syntactic names instead of
semantic names (e.g. `Star` and `DotDot` instead of `Mul` and `Range`).

compiler/rustc_expand/src/config.rs

@@ -328,7 +328,7 @@ impl<'a> StripUnconfigured<'a> {
 
         // For inner attributes, we do the same thing for the `!` in `#![attr]`.
         let mut trees = if cfg_attr.style == AttrStyle::Inner {
-            let Some(TokenTree::Token(bang_token @ Token { kind: TokenKind::Not, .. }, _)) =
+            let Some(TokenTree::Token(bang_token @ Token { kind: TokenKind::Bang, .. }, _)) =
                 orig_trees.next()
             else {
                 panic!("Bad tokens for attribute {cfg_attr:?}");

compiler/rustc_expand/src/mbe/macro_check.rs

@@ -432,7 +432,7 @@ fn check_nested_occurrences(
             }
             (
                 NestedMacroState::MacroRules,
-                &TokenTree::Token(Token { kind: TokenKind::Not, .. }),
+                &TokenTree::Token(Token { kind: TokenKind::Bang, .. }),
             ) => {
                 state = NestedMacroState::MacroRulesNot;
             }

compiler/rustc_expand/src/mbe/macro_rules.rs

@@ -690,7 +690,7 @@ fn has_compile_error_macro(rhs: &mbe::TokenTree) -> bool {
                     && let TokenKind::Ident(ident, _) = ident.kind
                     && ident == sym::compile_error
                     && let mbe::TokenTree::Token(bang) = bang
-                    && let TokenKind::Not = bang.kind
+                    && let TokenKind::Bang = bang.kind
                     && let mbe::TokenTree::Delimited(.., del) = args
                     && !del.delim.skip()
                 {

compiler/rustc_expand/src/proc_macro_server.rs

@@ -180,7 +180,7 @@ impl FromInternal<(TokenStream, &mut Rustc<'_, '_>)> for Vec<TokenTree<TokenStre
                 Gt => op(">"),
                 AndAnd => op("&&"),
                 OrOr => op("||"),
-                Not => op("!"),
+                Bang => op("!"),
                 Tilde => op("~"),
                 Plus => op("+"),
                 Minus => op("-"),
@@ -322,7 +322,7 @@ impl ToInternal<SmallVec<[tokenstream::TokenTree; 2]>>
                     b'=' => Eq,
                     b'<' => Lt,
                     b'>' => Gt,
-                    b'!' => Not,
+                    b'!' => Bang,
                     b'~' => Tilde,
                     b'+' => Plus,
                     b'-' => Minus,