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-rw-r--r--compiler/rustc_expand/src/build.rs218
1 files changed, 114 insertions, 104 deletions
diff --git a/compiler/rustc_expand/src/build.rs b/compiler/rustc_expand/src/build.rs
index 51d6e43ab67..c3e86ec0614 100644
--- a/compiler/rustc_expand/src/build.rs
+++ b/compiler/rustc_expand/src/build.rs
@@ -1,4 +1,3 @@
-use rustc_ast::ptr::P;
 use rustc_ast::token::Delimiter;
 use rustc_ast::tokenstream::TokenStream;
 use rustc_ast::util::literal;
@@ -59,10 +58,10 @@ impl<'a> ExtCtxt<'a> {
         path: ast::Path,
         delim: Delimiter,
         tokens: TokenStream,
-    ) -> P<ast::MacCall> {
-        P(ast::MacCall {
+    ) -> Box<ast::MacCall> {
+        Box::new(ast::MacCall {
             path,
-            args: P(ast::DelimArgs {
+            args: Box::new(ast::DelimArgs {
                 dspan: tokenstream::DelimSpan { open: span, close: span },
                 delim,
                 tokens,
@@ -70,32 +69,32 @@ impl<'a> ExtCtxt<'a> {
         })
     }
 
-    pub fn ty_mt(&self, ty: P<ast::Ty>, mutbl: ast::Mutability) -> ast::MutTy {
+    pub fn ty_mt(&self, ty: Box<ast::Ty>, mutbl: ast::Mutability) -> ast::MutTy {
         ast::MutTy { ty, mutbl }
     }
 
-    pub fn ty(&self, span: Span, kind: ast::TyKind) -> P<ast::Ty> {
-        P(ast::Ty { id: ast::DUMMY_NODE_ID, span, kind, tokens: None })
+    pub fn ty(&self, span: Span, kind: ast::TyKind) -> Box<ast::Ty> {
+        Box::new(ast::Ty { id: ast::DUMMY_NODE_ID, span, kind, tokens: None })
     }
 
-    pub fn ty_infer(&self, span: Span) -> P<ast::Ty> {
+    pub fn ty_infer(&self, span: Span) -> Box<ast::Ty> {
         self.ty(span, ast::TyKind::Infer)
     }
 
-    pub fn ty_path(&self, path: ast::Path) -> P<ast::Ty> {
+    pub fn ty_path(&self, path: ast::Path) -> Box<ast::Ty> {
         self.ty(path.span, ast::TyKind::Path(None, path))
     }
 
     // Might need to take bounds as an argument in the future, if you ever want
     // to generate a bounded existential trait type.
-    pub fn ty_ident(&self, span: Span, ident: Ident) -> P<ast::Ty> {
+    pub fn ty_ident(&self, span: Span, ident: Ident) -> Box<ast::Ty> {
         self.ty_path(self.path_ident(span, ident))
     }
 
     pub fn anon_const(&self, span: Span, kind: ast::ExprKind) -> ast::AnonConst {
         ast::AnonConst {
             id: ast::DUMMY_NODE_ID,
-            value: P(ast::Expr {
+            value: Box::new(ast::Expr {
                 id: ast::DUMMY_NODE_ID,
                 kind,
                 span,
@@ -112,14 +111,14 @@ impl<'a> ExtCtxt<'a> {
     pub fn ty_ref(
         &self,
         span: Span,
-        ty: P<ast::Ty>,
+        ty: Box<ast::Ty>,
         lifetime: Option<ast::Lifetime>,
         mutbl: ast::Mutability,
-    ) -> P<ast::Ty> {
+    ) -> Box<ast::Ty> {
         self.ty(span, ast::TyKind::Ref(lifetime, self.ty_mt(ty, mutbl)))
     }
 
-    pub fn ty_ptr(&self, span: Span, ty: P<ast::Ty>, mutbl: ast::Mutability) -> P<ast::Ty> {
+    pub fn ty_ptr(&self, span: Span, ty: Box<ast::Ty>, mutbl: ast::Mutability) -> Box<ast::Ty> {
         self.ty(span, ast::TyKind::Ptr(self.ty_mt(ty, mutbl)))
     }
 
@@ -128,7 +127,7 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         ident: Ident,
         bounds: ast::GenericBounds,
-        default: Option<P<ast::Ty>>,
+        default: Option<Box<ast::Ty>>,
     ) -> ast::GenericParam {
         ast::GenericParam {
             ident: ident.with_span_pos(span),
@@ -163,7 +162,7 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         ident: Ident,
         bounds: ast::GenericBounds,
-        ty: P<ast::Ty>,
+        ty: Box<ast::Ty>,
         default: Option<AnonConst>,
     ) -> ast::GenericParam {
         ast::GenericParam {
@@ -211,11 +210,11 @@ impl<'a> ExtCtxt<'a> {
         self.lifetime(span, Ident::new(kw::StaticLifetime, span))
     }
 
-    pub fn stmt_expr(&self, expr: P<ast::Expr>) -> ast::Stmt {
+    pub fn stmt_expr(&self, expr: Box<ast::Expr>) -> ast::Stmt {
         ast::Stmt { id: ast::DUMMY_NODE_ID, span: expr.span, kind: ast::StmtKind::Expr(expr) }
     }
 
-    pub fn stmt_let(&self, sp: Span, mutbl: bool, ident: Ident, ex: P<ast::Expr>) -> ast::Stmt {
+    pub fn stmt_let(&self, sp: Span, mutbl: bool, ident: Ident, ex: Box<ast::Expr>) -> ast::Stmt {
         self.stmt_let_ty(sp, mutbl, ident, None, ex)
     }
 
@@ -224,15 +223,15 @@ impl<'a> ExtCtxt<'a> {
         sp: Span,
         mutbl: bool,
         ident: Ident,
-        ty: Option<P<ast::Ty>>,
-        ex: P<ast::Expr>,
+        ty: Option<Box<ast::Ty>>,
+        ex: Box<ast::Expr>,
     ) -> ast::Stmt {
         let pat = if mutbl {
             self.pat_ident_binding_mode(sp, ident, ast::BindingMode::MUT)
         } else {
             self.pat_ident(sp, ident)
         };
-        let local = P(ast::Local {
+        let local = Box::new(ast::Local {
             super_: None,
             pat,
             ty,
@@ -247,8 +246,8 @@ impl<'a> ExtCtxt<'a> {
     }
 
     /// Generates `let _: Type;`, which is usually used for type assertions.
-    pub fn stmt_let_type_only(&self, span: Span, ty: P<ast::Ty>) -> ast::Stmt {
-        let local = P(ast::Local {
+    pub fn stmt_let_type_only(&self, span: Span, ty: Box<ast::Ty>) -> ast::Stmt {
+        let local = Box::new(ast::Local {
             super_: None,
             pat: self.pat_wild(span),
             ty: Some(ty),
@@ -262,19 +261,19 @@ impl<'a> ExtCtxt<'a> {
         self.stmt_local(local, span)
     }
 
-    pub fn stmt_semi(&self, expr: P<ast::Expr>) -> ast::Stmt {
+    pub fn stmt_semi(&self, expr: Box<ast::Expr>) -> ast::Stmt {
         ast::Stmt { id: ast::DUMMY_NODE_ID, span: expr.span, kind: ast::StmtKind::Semi(expr) }
     }
 
-    pub fn stmt_local(&self, local: P<ast::Local>, span: Span) -> ast::Stmt {
+    pub fn stmt_local(&self, local: Box<ast::Local>, span: Span) -> ast::Stmt {
         ast::Stmt { id: ast::DUMMY_NODE_ID, kind: ast::StmtKind::Let(local), span }
     }
 
-    pub fn stmt_item(&self, sp: Span, item: P<ast::Item>) -> ast::Stmt {
+    pub fn stmt_item(&self, sp: Span, item: Box<ast::Item>) -> ast::Stmt {
         ast::Stmt { id: ast::DUMMY_NODE_ID, kind: ast::StmtKind::Item(item), span: sp }
     }
 
-    pub fn block_expr(&self, expr: P<ast::Expr>) -> P<ast::Block> {
+    pub fn block_expr(&self, expr: Box<ast::Expr>) -> Box<ast::Block> {
         self.block(
             expr.span,
             thin_vec![ast::Stmt {
@@ -284,8 +283,8 @@ impl<'a> ExtCtxt<'a> {
             }],
         )
     }
-    pub fn block(&self, span: Span, stmts: ThinVec<ast::Stmt>) -> P<ast::Block> {
-        P(ast::Block {
+    pub fn block(&self, span: Span, stmts: ThinVec<ast::Stmt>) -> Box<ast::Block> {
+        Box::new(ast::Block {
             stmts,
             id: ast::DUMMY_NODE_ID,
             rules: BlockCheckMode::Default,
@@ -294,22 +293,28 @@ impl<'a> ExtCtxt<'a> {
         })
     }
 
-    pub fn expr(&self, span: Span, kind: ast::ExprKind) -> P<ast::Expr> {
-        P(ast::Expr { id: ast::DUMMY_NODE_ID, kind, span, attrs: AttrVec::new(), tokens: None })
+    pub fn expr(&self, span: Span, kind: ast::ExprKind) -> Box<ast::Expr> {
+        Box::new(ast::Expr {
+            id: ast::DUMMY_NODE_ID,
+            kind,
+            span,
+            attrs: AttrVec::new(),
+            tokens: None,
+        })
     }
 
-    pub fn expr_path(&self, path: ast::Path) -> P<ast::Expr> {
+    pub fn expr_path(&self, path: ast::Path) -> Box<ast::Expr> {
         self.expr(path.span, ast::ExprKind::Path(None, path))
     }
 
-    pub fn expr_ident(&self, span: Span, id: Ident) -> P<ast::Expr> {
+    pub fn expr_ident(&self, span: Span, id: Ident) -> Box<ast::Expr> {
         self.expr_path(self.path_ident(span, id))
     }
-    pub fn expr_self(&self, span: Span) -> P<ast::Expr> {
+    pub fn expr_self(&self, span: Span) -> Box<ast::Expr> {
         self.expr_ident(span, Ident::with_dummy_span(kw::SelfLower))
     }
 
-    pub fn expr_macro_call(&self, span: Span, call: P<ast::MacCall>) -> P<ast::Expr> {
+    pub fn expr_macro_call(&self, span: Span, call: Box<ast::MacCall>) -> Box<ast::Expr> {
         self.expr(span, ast::ExprKind::MacCall(call))
     }
 
@@ -317,31 +322,31 @@ impl<'a> ExtCtxt<'a> {
         &self,
         sp: Span,
         op: ast::BinOpKind,
-        lhs: P<ast::Expr>,
-        rhs: P<ast::Expr>,
-    ) -> P<ast::Expr> {
+        lhs: Box<ast::Expr>,
+        rhs: Box<ast::Expr>,
+    ) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Binary(Spanned { node: op, span: sp }, lhs, rhs))
     }
 
-    pub fn expr_deref(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_deref(&self, sp: Span, e: Box<ast::Expr>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Unary(UnOp::Deref, e))
     }
 
-    pub fn expr_addr_of(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_addr_of(&self, sp: Span, e: Box<ast::Expr>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::AddrOf(ast::BorrowKind::Ref, ast::Mutability::Not, e))
     }
 
-    pub fn expr_paren(&self, sp: Span, e: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_paren(&self, sp: Span, e: Box<ast::Expr>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Paren(e))
     }
 
     pub fn expr_method_call(
         &self,
         span: Span,
-        expr: P<ast::Expr>,
+        expr: Box<ast::Expr>,
         ident: Ident,
-        args: ThinVec<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        args: ThinVec<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         let seg = ast::PathSegment::from_ident(ident);
         self.expr(
             span,
@@ -357,38 +362,38 @@ impl<'a> ExtCtxt<'a> {
     pub fn expr_call(
         &self,
         span: Span,
-        expr: P<ast::Expr>,
-        args: ThinVec<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        expr: Box<ast::Expr>,
+        args: ThinVec<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         self.expr(span, ast::ExprKind::Call(expr, args))
     }
-    pub fn expr_loop(&self, sp: Span, block: P<ast::Block>) -> P<ast::Expr> {
+    pub fn expr_loop(&self, sp: Span, block: Box<ast::Block>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Loop(block, None, sp))
     }
-    pub fn expr_asm(&self, sp: Span, expr: P<ast::InlineAsm>) -> P<ast::Expr> {
+    pub fn expr_asm(&self, sp: Span, expr: Box<ast::InlineAsm>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::InlineAsm(expr))
     }
     pub fn expr_call_ident(
         &self,
         span: Span,
         id: Ident,
-        args: ThinVec<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        args: ThinVec<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         self.expr(span, ast::ExprKind::Call(self.expr_ident(span, id), args))
     }
     pub fn expr_call_global(
         &self,
         sp: Span,
         fn_path: Vec<Ident>,
-        args: ThinVec<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        args: ThinVec<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         let pathexpr = self.expr_path(self.path_global(sp, fn_path));
         self.expr_call(sp, pathexpr, args)
     }
-    pub fn expr_block(&self, b: P<ast::Block>) -> P<ast::Expr> {
+    pub fn expr_block(&self, b: Box<ast::Block>) -> Box<ast::Expr> {
         self.expr(b.span, ast::ExprKind::Block(b, None))
     }
-    pub fn field_imm(&self, span: Span, ident: Ident, e: P<ast::Expr>) -> ast::ExprField {
+    pub fn field_imm(&self, span: Span, ident: Ident, e: Box<ast::Expr>) -> ast::ExprField {
         ast::ExprField {
             ident: ident.with_span_pos(span),
             expr: e,
@@ -404,10 +409,10 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         path: ast::Path,
         fields: ThinVec<ast::ExprField>,
-    ) -> P<ast::Expr> {
+    ) -> Box<ast::Expr> {
         self.expr(
             span,
-            ast::ExprKind::Struct(P(ast::StructExpr {
+            ast::ExprKind::Struct(Box::new(ast::StructExpr {
                 qself: None,
                 path,
                 fields,
@@ -420,61 +425,61 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         id: Ident,
         fields: ThinVec<ast::ExprField>,
-    ) -> P<ast::Expr> {
+    ) -> Box<ast::Expr> {
         self.expr_struct(span, self.path_ident(span, id), fields)
     }
 
-    pub fn expr_usize(&self, span: Span, n: usize) -> P<ast::Expr> {
+    pub fn expr_usize(&self, span: Span, n: usize) -> Box<ast::Expr> {
         let suffix = Some(ast::UintTy::Usize.name());
         let lit = token::Lit::new(token::Integer, sym::integer(n), suffix);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
-    pub fn expr_u32(&self, span: Span, n: u32) -> P<ast::Expr> {
+    pub fn expr_u32(&self, span: Span, n: u32) -> Box<ast::Expr> {
         let suffix = Some(ast::UintTy::U32.name());
         let lit = token::Lit::new(token::Integer, sym::integer(n), suffix);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
-    pub fn expr_bool(&self, span: Span, value: bool) -> P<ast::Expr> {
+    pub fn expr_bool(&self, span: Span, value: bool) -> Box<ast::Expr> {
         let lit = token::Lit::new(token::Bool, if value { kw::True } else { kw::False }, None);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
-    pub fn expr_str(&self, span: Span, s: Symbol) -> P<ast::Expr> {
+    pub fn expr_str(&self, span: Span, s: Symbol) -> Box<ast::Expr> {
         let lit = token::Lit::new(token::Str, literal::escape_string_symbol(s), None);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
-    pub fn expr_byte_str(&self, span: Span, bytes: Vec<u8>) -> P<ast::Expr> {
+    pub fn expr_byte_str(&self, span: Span, bytes: Vec<u8>) -> Box<ast::Expr> {
         let lit = token::Lit::new(token::ByteStr, literal::escape_byte_str_symbol(&bytes), None);
         self.expr(span, ast::ExprKind::Lit(lit))
     }
 
     /// `[expr1, expr2, ...]`
-    pub fn expr_array(&self, sp: Span, exprs: ThinVec<P<ast::Expr>>) -> P<ast::Expr> {
+    pub fn expr_array(&self, sp: Span, exprs: ThinVec<Box<ast::Expr>>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Array(exprs))
     }
 
     /// `&[expr1, expr2, ...]`
-    pub fn expr_array_ref(&self, sp: Span, exprs: ThinVec<P<ast::Expr>>) -> P<ast::Expr> {
+    pub fn expr_array_ref(&self, sp: Span, exprs: ThinVec<Box<ast::Expr>>) -> Box<ast::Expr> {
         self.expr_addr_of(sp, self.expr_array(sp, exprs))
     }
 
-    pub fn expr_some(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_some(&self, sp: Span, expr: Box<ast::Expr>) -> Box<ast::Expr> {
         let some = self.std_path(&[sym::option, sym::Option, sym::Some]);
         self.expr_call_global(sp, some, thin_vec![expr])
     }
 
-    pub fn expr_none(&self, sp: Span) -> P<ast::Expr> {
+    pub fn expr_none(&self, sp: Span) -> Box<ast::Expr> {
         let none = self.std_path(&[sym::option, sym::Option, sym::None]);
         self.expr_path(self.path_global(sp, none))
     }
-    pub fn expr_tuple(&self, sp: Span, exprs: ThinVec<P<ast::Expr>>) -> P<ast::Expr> {
+    pub fn expr_tuple(&self, sp: Span, exprs: ThinVec<Box<ast::Expr>>) -> Box<ast::Expr> {
         self.expr(sp, ast::ExprKind::Tup(exprs))
     }
 
-    pub fn expr_unreachable(&self, span: Span) -> P<ast::Expr> {
+    pub fn expr_unreachable(&self, span: Span) -> Box<ast::Expr> {
         self.expr_macro_call(
             span,
             self.macro_call(
@@ -489,12 +494,12 @@ impl<'a> ExtCtxt<'a> {
         )
     }
 
-    pub fn expr_ok(&self, sp: Span, expr: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_ok(&self, sp: Span, expr: Box<ast::Expr>) -> Box<ast::Expr> {
         let ok = self.std_path(&[sym::result, sym::Result, sym::Ok]);
         self.expr_call_global(sp, ok, thin_vec![expr])
     }
 
-    pub fn expr_try(&self, sp: Span, head: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn expr_try(&self, sp: Span, head: Box<ast::Expr>) -> Box<ast::Expr> {
         let ok = self.std_path(&[sym::result, sym::Result, sym::Ok]);
         let ok_path = self.path_global(sp, ok);
         let err = self.std_path(&[sym::result, sym::Result, sym::Err]);
@@ -523,16 +528,16 @@ impl<'a> ExtCtxt<'a> {
         self.expr_match(sp, head, thin_vec![ok_arm, err_arm])
     }
 
-    pub fn pat(&self, span: Span, kind: PatKind) -> P<ast::Pat> {
-        P(ast::Pat { id: ast::DUMMY_NODE_ID, kind, span, tokens: None })
+    pub fn pat(&self, span: Span, kind: PatKind) -> Box<ast::Pat> {
+        Box::new(ast::Pat { id: ast::DUMMY_NODE_ID, kind, span, tokens: None })
     }
-    pub fn pat_wild(&self, span: Span) -> P<ast::Pat> {
+    pub fn pat_wild(&self, span: Span) -> Box<ast::Pat> {
         self.pat(span, PatKind::Wild)
     }
-    pub fn pat_lit(&self, span: Span, expr: P<ast::Expr>) -> P<ast::Pat> {
+    pub fn pat_lit(&self, span: Span, expr: Box<ast::Expr>) -> Box<ast::Pat> {
         self.pat(span, PatKind::Expr(expr))
     }
-    pub fn pat_ident(&self, span: Span, ident: Ident) -> P<ast::Pat> {
+    pub fn pat_ident(&self, span: Span, ident: Ident) -> Box<ast::Pat> {
         self.pat_ident_binding_mode(span, ident, ast::BindingMode::NONE)
     }
 
@@ -541,19 +546,19 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         ident: Ident,
         ann: ast::BindingMode,
-    ) -> P<ast::Pat> {
+    ) -> Box<ast::Pat> {
         let pat = PatKind::Ident(ann, ident.with_span_pos(span), None);
         self.pat(span, pat)
     }
-    pub fn pat_path(&self, span: Span, path: ast::Path) -> P<ast::Pat> {
+    pub fn pat_path(&self, span: Span, path: ast::Path) -> Box<ast::Pat> {
         self.pat(span, PatKind::Path(None, path))
     }
     pub fn pat_tuple_struct(
         &self,
         span: Span,
         path: ast::Path,
-        subpats: ThinVec<P<ast::Pat>>,
-    ) -> P<ast::Pat> {
+        subpats: ThinVec<Box<ast::Pat>>,
+    ) -> Box<ast::Pat> {
         self.pat(span, PatKind::TupleStruct(None, path, subpats))
     }
     pub fn pat_struct(
@@ -561,20 +566,20 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         path: ast::Path,
         field_pats: ThinVec<ast::PatField>,
-    ) -> P<ast::Pat> {
+    ) -> Box<ast::Pat> {
         self.pat(span, PatKind::Struct(None, path, field_pats, ast::PatFieldsRest::None))
     }
-    pub fn pat_tuple(&self, span: Span, pats: ThinVec<P<ast::Pat>>) -> P<ast::Pat> {
+    pub fn pat_tuple(&self, span: Span, pats: ThinVec<Box<ast::Pat>>) -> Box<ast::Pat> {
         self.pat(span, PatKind::Tuple(pats))
     }
 
-    pub fn pat_some(&self, span: Span, pat: P<ast::Pat>) -> P<ast::Pat> {
+    pub fn pat_some(&self, span: Span, pat: Box<ast::Pat>) -> Box<ast::Pat> {
         let some = self.std_path(&[sym::option, sym::Option, sym::Some]);
         let path = self.path_global(span, some);
         self.pat_tuple_struct(span, path, thin_vec![pat])
     }
 
-    pub fn arm(&self, span: Span, pat: P<ast::Pat>, expr: P<ast::Expr>) -> ast::Arm {
+    pub fn arm(&self, span: Span, pat: Box<ast::Pat>, expr: Box<ast::Expr>) -> ast::Arm {
         ast::Arm {
             attrs: AttrVec::new(),
             pat,
@@ -590,22 +595,27 @@ impl<'a> ExtCtxt<'a> {
         self.arm(span, self.pat_wild(span), self.expr_unreachable(span))
     }
 
-    pub fn expr_match(&self, span: Span, arg: P<ast::Expr>, arms: ThinVec<ast::Arm>) -> P<Expr> {
+    pub fn expr_match(
+        &self,
+        span: Span,
+        arg: Box<ast::Expr>,
+        arms: ThinVec<ast::Arm>,
+    ) -> Box<Expr> {
         self.expr(span, ast::ExprKind::Match(arg, arms, MatchKind::Prefix))
     }
 
     pub fn expr_if(
         &self,
         span: Span,
-        cond: P<ast::Expr>,
-        then: P<ast::Expr>,
-        els: Option<P<ast::Expr>>,
-    ) -> P<ast::Expr> {
+        cond: Box<ast::Expr>,
+        then: Box<ast::Expr>,
+        els: Option<Box<ast::Expr>>,
+    ) -> Box<ast::Expr> {
         let els = els.map(|x| self.expr_block(self.block_expr(x)));
         self.expr(span, ast::ExprKind::If(cond, self.block_expr(then), els))
     }
 
-    pub fn lambda(&self, span: Span, ids: Vec<Ident>, body: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn lambda(&self, span: Span, ids: Vec<Ident>, body: Box<ast::Expr>) -> Box<ast::Expr> {
         let fn_decl = self.fn_decl(
             ids.iter().map(|id| self.param(span, *id, self.ty(span, ast::TyKind::Infer))).collect(),
             ast::FnRetTy::Default(span),
@@ -633,11 +643,11 @@ impl<'a> ExtCtxt<'a> {
         )
     }
 
-    pub fn lambda0(&self, span: Span, body: P<ast::Expr>) -> P<ast::Expr> {
+    pub fn lambda0(&self, span: Span, body: Box<ast::Expr>) -> Box<ast::Expr> {
         self.lambda(span, Vec::new(), body)
     }
 
-    pub fn lambda1(&self, span: Span, body: P<ast::Expr>, ident: Ident) -> P<ast::Expr> {
+    pub fn lambda1(&self, span: Span, body: Box<ast::Expr>, ident: Ident) -> Box<ast::Expr> {
         self.lambda(span, vec![ident], body)
     }
 
@@ -646,11 +656,11 @@ impl<'a> ExtCtxt<'a> {
         span: Span,
         stmts: ThinVec<ast::Stmt>,
         ident: Ident,
-    ) -> P<ast::Expr> {
+    ) -> Box<ast::Expr> {
         self.lambda1(span, self.expr_block(self.block(span, stmts)), ident)
     }
 
-    pub fn param(&self, span: Span, ident: Ident, ty: P<ast::Ty>) -> ast::Param {
+    pub fn param(&self, span: Span, ident: Ident, ty: Box<ast::Ty>) -> ast::Param {
         let arg_pat = self.pat_ident(span, ident);
         ast::Param {
             attrs: AttrVec::default(),
@@ -663,12 +673,12 @@ impl<'a> ExtCtxt<'a> {
     }
 
     // `self` is unused but keep it as method for the convenience use.
-    pub fn fn_decl(&self, inputs: ThinVec<ast::Param>, output: ast::FnRetTy) -> P<ast::FnDecl> {
-        P(ast::FnDecl { inputs, output })
+    pub fn fn_decl(&self, inputs: ThinVec<ast::Param>, output: ast::FnRetTy) -> Box<ast::FnDecl> {
+        Box::new(ast::FnDecl { inputs, output })
     }
 
-    pub fn item(&self, span: Span, attrs: ast::AttrVec, kind: ast::ItemKind) -> P<ast::Item> {
-        P(ast::Item {
+    pub fn item(&self, span: Span, attrs: ast::AttrVec, kind: ast::ItemKind) -> Box<ast::Item> {
+        Box::new(ast::Item {
             attrs,
             id: ast::DUMMY_NODE_ID,
             kind,
@@ -686,10 +696,10 @@ impl<'a> ExtCtxt<'a> {
         &self,
         span: Span,
         ident: Ident,
-        ty: P<ast::Ty>,
+        ty: Box<ast::Ty>,
         mutability: ast::Mutability,
-        expr: P<ast::Expr>,
-    ) -> P<ast::Item> {
+        expr: Box<ast::Expr>,
+    ) -> Box<ast::Item> {
         self.item(
             span,
             AttrVec::new(),
@@ -711,9 +721,9 @@ impl<'a> ExtCtxt<'a> {
         &self,
         span: Span,
         ident: Ident,
-        ty: P<ast::Ty>,
-        expr: P<ast::Expr>,
-    ) -> P<ast::Item> {
+        ty: Box<ast::Ty>,
+        expr: Box<ast::Expr>,
+    ) -> Box<ast::Item> {
         let defaultness = ast::Defaultness::Final;
         self.item(
             span,