Turn ast::Lit into a struct

src/librustc/ich/impls_syntax.rs

@@ -162,7 +162,11 @@ impl_stable_hash_for!(enum ::syntax::ast::LitIntType {
     Unsuffixed
 });
 
-impl_stable_hash_for_spanned!(::syntax::ast::LitKind);
+impl_stable_hash_for!(struct ::syntax::ast::Lit {
+    node,
+    span
+});
+
 impl_stable_hash_for!(enum ::syntax::ast::LitKind {
     Str(value, style),
     Err(value),

src/libsyntax/ast.rs

@@ -1351,7 +1351,11 @@ pub enum StrStyle {
 }
 
 /// A literal.
-pub type Lit = Spanned<LitKind>;
+#[derive(Clone, RustcEncodable, RustcDecodable, Debug, Hash, PartialEq)]
+pub struct Lit {
+    pub node: LitKind,
+    pub span: Span,
+}
 
 #[derive(Clone, RustcEncodable, RustcDecodable, Debug, Copy, Hash, PartialEq)]
 pub enum LitIntType {

src/libsyntax/attr/mod.rs

@@ -16,7 +16,7 @@ use crate::ast::{AttrId, Attribute, AttrStyle, Name, Ident, Path, PathSegment};
 use crate::ast::{MetaItem, MetaItemKind, NestedMetaItem};
 use crate::ast::{Lit, LitKind, Expr, ExprKind, Item, Local, Stmt, StmtKind, GenericParam};
 use crate::mut_visit::visit_clobber;
-use crate::source_map::{BytePos, Spanned, respan, dummy_spanned};
+use crate::source_map::{BytePos, Spanned, dummy_spanned};
 use crate::parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration};
 use crate::parse::parser::Parser;
 use crate::parse::{self, ParseSess, PResult};
@@ -350,11 +350,11 @@ impl Attribute {
 /* Constructors */
 
 pub fn mk_name_value_item_str(ident: Ident, value: Spanned<Symbol>) -> MetaItem {
-    let value = respan(value.span, LitKind::Str(value.node, ast::StrStyle::Cooked));
+    let value = Lit { node: LitKind::Str(value.node, ast::StrStyle::Cooked), span: value.span };
     mk_name_value_item(ident.span.to(value.span), ident, value)
 }
 
-pub fn mk_name_value_item(span: Span, ident: Ident, value: ast::Lit) -> MetaItem {
+pub fn mk_name_value_item(span: Span, ident: Ident, value: Lit) -> MetaItem {
     MetaItem { path: Path::from_ident(ident), span, node: MetaItemKind::NameValue(value) }
 }
 
@@ -417,7 +417,7 @@ pub fn mk_spanned_attr_outer(sp: Span, id: AttrId, item: MetaItem) -> Attribute
 
 pub fn mk_sugared_doc_attr(id: AttrId, text: Symbol, span: Span) -> Attribute {
     let style = doc_comment_style(&text.as_str());
-    let lit = respan(span, LitKind::Str(text, ast::StrStyle::Cooked));
+    let lit = Lit { node: LitKind::Str(text, ast::StrStyle::Cooked), span };
     Attribute {
         id,
         style,
@@ -562,7 +562,7 @@ impl MetaItemKind {
                 tokens.next();
                 return if let Some(TokenTree::Token(span, token)) = tokens.next() {
                     LitKind::from_token(token)
-                        .map(|lit| MetaItemKind::NameValue(Spanned { node: lit, span: span }))
+                        .map(|node| MetaItemKind::NameValue(Lit { node, span }))
                 } else {
                     None
                 };
@@ -609,7 +609,7 @@ impl NestedMetaItem {
         if let Some(TokenTree::Token(span, token)) = tokens.peek().cloned() {
             if let Some(node) = LitKind::from_token(token) {
                 tokens.next();
-                return Some(NestedMetaItem::Literal(respan(span, node)));
+                return Some(NestedMetaItem::Literal(Lit { node, span }));
             }
         }
 

src/libsyntax/ext/build.rs

@@ -697,8 +697,8 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         self.expr_struct(span, self.path_ident(span, id), fields)
     }
 
-    fn expr_lit(&self, sp: Span, lit: ast::LitKind) -> P<ast::Expr> {
-        self.expr(sp, ast::ExprKind::Lit(respan(sp, lit)))
+    fn expr_lit(&self, span: Span, node: ast::LitKind) -> P<ast::Expr> {
+        self.expr(span, ast::ExprKind::Lit(ast::Lit { node, span }))
     }
     fn expr_usize(&self, span: Span, i: usize) -> P<ast::Expr> {
         self.expr_lit(span, ast::LitKind::Int(i as u128,
@@ -1164,10 +1164,10 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         attr::mk_list_item(sp, Ident::with_empty_ctxt(name).with_span_pos(sp), mis)
     }
 
-    fn meta_name_value(&self, sp: Span, name: ast::Name, value: ast::LitKind)
+    fn meta_name_value(&self, span: Span, name: ast::Name, node: ast::LitKind)
                        -> ast::MetaItem {
-        attr::mk_name_value_item(sp, Ident::with_empty_ctxt(name).with_span_pos(sp),
-                                 respan(sp, value))
+        attr::mk_name_value_item(span, Ident::with_empty_ctxt(name).with_span_pos(span),
+                                 ast::Lit { node, span })
     }
 
     fn item_use(&self, sp: Span,

src/libsyntax/parse/parser.rs

@@ -2140,15 +2140,14 @@ impl<'a> Parser<'a> {
     /// Matches `lit = true | false | token_lit`.
     crate fn parse_lit(&mut self) -> PResult<'a, Lit> {
         let lo = self.span;
-        let lit = if self.eat_keyword(keywords::True) {
+        let node = if self.eat_keyword(keywords::True) {
             LitKind::Bool(true)
         } else if self.eat_keyword(keywords::False) {
             LitKind::Bool(false)
         } else {
-            let lit = self.parse_lit_token()?;
-            lit
+            self.parse_lit_token()?
         };
-        Ok(source_map::Spanned { node: lit, span: lo.to(self.prev_span) })
+        Ok(Lit { node, span: lo.to(self.prev_span) })
     }
 
     /// Matches `'-' lit | lit` (cf. `ast_validation::AstValidator::check_expr_within_pat`).