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.

Author: nnethercote

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) => {
-                rewrite_literal(context, l.token_lit, l.span, shape)
-            }
+            ast::NestedMetaItem::Lit(ref l) => 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/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/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,
     }
 }