Rename NestedMetaItem::[Ll]iteral as NestedMetaItem::[Ll]it.

We already use a mix of `Literal` and `Lit`. The latter is better
because it is shorter without causing any ambiguity.

compiler/rustc_ast/src/ast.rs

@@ -489,7 +489,7 @@ pub enum NestedMetaItem {
     /// A literal.
     ///
     /// E.g., `"foo"`, `64`, `true`.
-    Literal(MetaItemLit),
+    Lit(MetaItemLit),
 }
 
 /// A spanned compile-time attribute item.

compiler/rustc_ast/src/attr/mod.rs

@@ -51,9 +51,9 @@ impl NestedMetaItem {
     }
 
     /// Returns the `MetaItemLit` if `self` is a `NestedMetaItem::Literal`s.
-    pub fn literal(&self) -> Option<&MetaItemLit> {
+    pub fn lit(&self) -> Option<&MetaItemLit> {
         match self {
-            NestedMetaItem::Literal(lit) => Some(lit),
+            NestedMetaItem::Lit(lit) => Some(lit),
             _ => None,
         }
     }
@@ -83,7 +83,7 @@ impl NestedMetaItem {
             meta_item.meta_item_list().and_then(|meta_item_list| {
                 if meta_item_list.len() == 1
                     && let Some(ident) = meta_item.ident()
-                    && let Some(lit) = meta_item_list[0].literal()
+                    && let Some(lit) = meta_item_list[0].lit()
                 {
                     return Some((ident.name, lit));
                 }
@@ -655,14 +655,14 @@ impl NestedMetaItem {
     pub fn span(&self) -> Span {
         match self {
             NestedMetaItem::MetaItem(item) => item.span,
-            NestedMetaItem::Literal(lit) => lit.span,
+            NestedMetaItem::Lit(lit) => lit.span,
         }
     }
 
     fn token_trees(&self) -> Vec<TokenTree> {
         match self {
             NestedMetaItem::MetaItem(item) => item.token_trees(),
-            NestedMetaItem::Literal(lit) => {
+            NestedMetaItem::Lit(lit) => {
                 vec![TokenTree::Token(lit.to_token(), Spacing::Alone)]
             }
         }
@@ -677,7 +677,7 @@ impl NestedMetaItem {
                 if let Some(lit) = MetaItemLit::from_token(token) =>
             {
                 tokens.next();
-                return Some(NestedMetaItem::Literal(lit));
+                return Some(NestedMetaItem::Lit(lit));
             }
             Some(TokenTree::Delimited(_, Delimiter::Invisible, inner_tokens)) => {
                 let inner_tokens = inner_tokens.clone();

compiler/rustc_ast/src/mut_visit.rs

@@ -628,7 +628,7 @@ pub fn noop_visit_macro_def<T: MutVisitor>(macro_def: &mut MacroDef, vis: &mut T
 pub fn noop_visit_meta_list_item<T: MutVisitor>(li: &mut NestedMetaItem, vis: &mut T) {
     match li {
         NestedMetaItem::MetaItem(mi) => vis.visit_meta_item(mi),
-        NestedMetaItem::Literal(_lit) => {}
+        NestedMetaItem::Lit(_lit) => {}
     }
 }
 

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -498,7 +498,7 @@ pub trait PrintState<'a>: std::ops::Deref<Target = pp::Printer> + std::ops::Dere
     fn print_meta_list_item(&mut self, item: &ast::NestedMetaItem) {
         match item {
             ast::NestedMetaItem::MetaItem(ref mi) => self.print_meta_item(mi),
-            ast::NestedMetaItem::Literal(ref lit) => self.print_meta_item_lit(lit),
+            ast::NestedMetaItem::Lit(ref lit) => self.print_meta_item_lit(lit),
         }
     }
 

compiler/rustc_attr/src/builtin.rs

@@ -486,7 +486,7 @@ where
                                     continue 'outer;
                                 }
                             },
-                            NestedMetaItem::Literal(lit) => {
+                            NestedMetaItem::Lit(lit) => {
                                 handle_errors(
                                     &sess.parse_sess,
                                     lit.span,
@@ -658,13 +658,11 @@ pub fn eval_condition(
         ast::MetaItemKind::List(ref mis) if cfg.name_or_empty() == sym::version => {
             try_gate_cfg(sym::version, cfg.span, sess, features);
             let (min_version, span) = match &mis[..] {
+                [NestedMetaItem::Lit(MetaItemLit { kind: LitKind::Str(sym, ..), span, .. })] => {
+                    (sym, span)
+                }
                 [
-                    NestedMetaItem::Literal(MetaItemLit {
+                    NestedMetaItem::Lit(MetaItemLit { span, .. })
-                        kind: LitKind::Str(sym, ..), span, ..
-                    }),
-                ] => (sym, span),
-                [
-                    NestedMetaItem::Literal(MetaItemLit { span, .. })
                     | NestedMetaItem::MetaItem(MetaItem { span, .. }),
                 ] => {
                     sess.emit_err(session_diagnostics::ExpectedVersionLiteral { span: *span });
@@ -901,7 +899,7 @@ where
                                 continue 'outer;
                             }
                         },
-                        NestedMetaItem::Literal(lit) => {
+                        NestedMetaItem::Lit(lit) => {
                             handle_errors(
                                 &sess.parse_sess,
                                 lit.span,

compiler/rustc_builtin_macros/src/derive.rs

@@ -48,7 +48,7 @@ impl MultiItemModifier for Expander {
                     .into_iter()
                     .filter_map(|nested_meta| match nested_meta {
                         NestedMetaItem::MetaItem(meta) => Some(meta),
-                        NestedMetaItem::Literal(lit) => {
+                        NestedMetaItem::Lit(lit) => {
                             // Reject `#[derive("Debug")]`.
                             report_unexpected_meta_item_lit(sess, &lit);
                             None

compiler/rustc_hir_analysis/src/collect.rs

@@ -2158,7 +2158,7 @@ fn check_link_ordinal(tcx: TyCtxt<'_>, attr: &ast::Attribute) -> Option<u16> {
     let meta_item_list = attr.meta_item_list();
     let meta_item_list = meta_item_list.as_deref();
     let sole_meta_list = match meta_item_list {
-        Some([item]) => item.literal(),
+        Some([item]) => item.lit(),
         Some(_) => {
             tcx.sess
                 .struct_span_err(attr.span, "incorrect number of arguments to `#[link_ordinal]`")

compiler/rustc_interface/src/interface.rs

@@ -194,7 +194,7 @@ pub fn parse_check_cfg(specs: Vec<String>) -> CheckCfg {
 
                                         for val in values {
                                             if let Some(LitKind::Str(s, _)) =
-                                                val.literal().map(|lit| &lit.kind)
+                                                val.lit().map(|lit| &lit.kind)
                                             {
                                                 ident_values.insert(s.to_string());
                                             } else {

compiler/rustc_lint/src/internal.rs

@@ -462,8 +462,8 @@ impl LateLintPass<'_> for BadOptAccess {
                 let Some(attr) = cx.tcx.get_attr(field.did, sym::rustc_lint_opt_deny_field_access) &&
                 let Some(items) = attr.meta_item_list()  &&
                 let Some(item) = items.first()  &&
-                let Some(literal) = item.literal()  &&
+                let Some(lit) = item.lit()  &&
-                let ast::LitKind::Str(val, _) = literal.kind
+                let ast::LitKind::Str(val, _) = lit.kind
             {
                 cx.struct_span_lint(BAD_OPT_ACCESS, expr.span, val.as_str(), |lint|
                     lint

compiler/rustc_middle/src/ty/context.rs

@@ -1191,7 +1191,7 @@ impl<'tcx> TyCtxt<'tcx> {
             debug!("layout_scalar_valid_range: attr={:?}", attr);
             if let Some(
                 &[
-                    ast::NestedMetaItem::Literal(ast::MetaItemLit {
+                    ast::NestedMetaItem::Lit(ast::MetaItemLit {
                         kind: ast::LitKind::Int(a, _),
                         ..
                     }),

compiler/rustc_parse/src/parser/attr.rs

@@ -405,7 +405,7 @@ impl<'a> Parser<'a> {
     /// Matches `meta_item_inner : (meta_item | UNSUFFIXED_LIT) ;`.
     fn parse_meta_item_inner(&mut self) -> PResult<'a, ast::NestedMetaItem> {
         match self.parse_unsuffixed_meta_item_lit() {
-            Ok(lit) => return Ok(ast::NestedMetaItem::Literal(lit)),
+            Ok(lit) => return Ok(ast::NestedMetaItem::Lit(lit)),
             Err(err) => err.cancel(),
         }
 

compiler/rustc_passes/src/check_attr.rs

@@ -715,7 +715,7 @@ impl CheckAttrVisitor<'_> {
         if let Some(values) = meta.meta_item_list() {
             let mut errors = 0;
             for v in values {
-                match v.literal() {
+                match v.lit() {
                     Some(l) => match l.kind {
                         LitKind::Str(s, _) => {
                             if !self.check_doc_alias_value(v, s, hir_id, target, true, aliases) {
@@ -1355,10 +1355,7 @@ impl CheckAttrVisitor<'_> {
             return false;
         };
 
-        if matches!(
+        if matches!(&list[..], &[NestedMetaItem::Lit(MetaItemLit { kind: LitKind::Int(..), .. })]) {
-            &list[..],
-            &[NestedMetaItem::Literal(MetaItemLit { kind: LitKind::Int(..), .. })]
-        ) {
             true
         } else {
             self.tcx.sess.emit_err(errors::RustcLayoutScalarValidRangeArg { attr_span: attr.span });
@@ -1421,7 +1418,7 @@ impl CheckAttrVisitor<'_> {
         let arg_count = decl.inputs.len() as u128 + generics.params.len() as u128;
         let mut invalid_args = vec![];
         for meta in list {
-            if let Some(LitKind::Int(val, _)) = meta.literal().map(|lit| &lit.kind) {
+            if let Some(LitKind::Int(val, _)) = meta.lit().map(|lit| &lit.kind) {
                 if *val >= arg_count {
                     let span = meta.span();
                     self.tcx.sess.emit_err(errors::RustcLegacyConstGenericsIndexExceed {

compiler/rustc_resolve/src/lib.rs

@@ -1989,7 +1989,7 @@ impl<'a> Resolver<'a> {
                     .find(|a| a.has_name(sym::rustc_legacy_const_generics))?;
                 let mut ret = Vec::new();
                 for meta in attr.meta_item_list()? {
-                    match meta.literal()?.kind {
+                    match meta.lit()?.kind {
                         LitKind::Int(a, _) => ret.push(a as usize),
                         _ => panic!("invalid arg index"),
                     }

src/librustdoc/clean/cfg.rs

@@ -50,7 +50,7 @@ impl Cfg {
     ) -> Result<Option<Cfg>, InvalidCfgError> {
         match nested_cfg {
             NestedMetaItem::MetaItem(ref cfg) => Cfg::parse_without(cfg, exclude),
-            NestedMetaItem::Literal(ref lit) => {
+            NestedMetaItem::Lit(ref lit) => {
                 Err(InvalidCfgError { msg: "unexpected literal", span: lit.span })
             }
         }

src/librustdoc/clean/mod.rs

@@ -893,7 +893,7 @@ fn clean_fn_decl_legacy_const_generics(func: &mut Function, attrs: &[ast::Attrib
         .filter(|a| a.has_name(sym::rustc_legacy_const_generics))
         .filter_map(|a| a.meta_item_list())
     {
-        for (pos, literal) in meta_item_list.iter().filter_map(|meta| meta.literal()).enumerate() {
+        for (pos, literal) in meta_item_list.iter().filter_map(|meta| meta.lit()).enumerate() {
             match literal.kind {
                 ast::LitKind::Int(a, _) => {
                     let gen = func.generics.params.remove(0);

src/librustdoc/clean/types.rs

@@ -1305,7 +1305,7 @@ impl Attributes {
         for attr in self.other_attrs.lists(sym::doc).filter(|a| a.has_name(sym::alias)) {
             if let Some(values) = attr.meta_item_list() {
                 for l in values {
-                    match l.literal().unwrap().kind {
+                    match l.lit().unwrap().kind {
                         ast::LitKind::Str(s, _) => {
                             aliases.insert(s);
                         }

src/tools/rustfmt/src/attr.rs

@@ -260,9 +260,7 @@ impl Rewrite for ast::NestedMetaItem {
     fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
         match self {
             ast::NestedMetaItem::MetaItem(ref meta_item) => meta_item.rewrite(context, shape),
-            ast::NestedMetaItem::Literal(ref l) => {
+            ast::NestedMetaItem::Lit(ref l) => rewrite_literal(context, l.token_lit, l.span, shape),
-                rewrite_literal(context, l.token_lit, l.span, shape)
-            }
         }
     }
 }
@@ -537,7 +535,7 @@ pub(crate) trait MetaVisitor<'ast> {
     fn visit_nested_meta_item(&mut self, nm: &'ast ast::NestedMetaItem) {
         match nm {
             ast::NestedMetaItem::MetaItem(ref meta_item) => self.visit_meta_item(meta_item),
-            ast::NestedMetaItem::Literal(ref lit) => self.visit_meta_item_lit(lit),
+            ast::NestedMetaItem::Lit(ref lit) => self.visit_meta_item_lit(lit),
         }
     }
 

src/tools/rustfmt/src/overflow.rs

@@ -125,7 +125,7 @@ impl<'a> OverflowableItem<'a> {
             OverflowableItem::MacroArg(MacroArg::Keyword(..)) => true,
             OverflowableItem::MacroArg(MacroArg::Expr(expr)) => is_simple_expr(expr),
             OverflowableItem::NestedMetaItem(nested_meta_item) => match nested_meta_item {
-                ast::NestedMetaItem::Literal(..) => true,
+                ast::NestedMetaItem::Lit(..) => true,
                 ast::NestedMetaItem::MetaItem(ref meta_item) => {
                     matches!(meta_item.kind, ast::MetaItemKind::Word)
                 }
@@ -169,7 +169,7 @@ impl<'a> OverflowableItem<'a> {
             },
             OverflowableItem::NestedMetaItem(nested_meta_item) if len == 1 => {
                 match nested_meta_item {
-                    ast::NestedMetaItem::Literal(..) => false,
+                    ast::NestedMetaItem::Lit(..) => false,
                     ast::NestedMetaItem::MetaItem(..) => true,
                 }
             }

src/tools/rustfmt/src/utils.rs

@@ -263,7 +263,7 @@ fn is_skip(meta_item: &MetaItem) -> bool {
 fn is_skip_nested(meta_item: &NestedMetaItem) -> bool {
     match meta_item {
         NestedMetaItem::MetaItem(ref mi) => is_skip(mi),
-        NestedMetaItem::Literal(_) => false,
+        NestedMetaItem::Lit(_) => false,
     }
 }