[breaking-change] move ast_util functions to methods

src/librustc/util/ppaux.rs

@@ -24,7 +24,7 @@ use middle::ty::{self, TypeAndMut, Ty, HasTypeFlags};
 use middle::ty::fold::TypeFoldable;
 
 use std::fmt;
-use syntax::{abi, ast_util};
+use syntax::{abi};
 use syntax::parse::token;
 use syntax::ast::CRATE_NODE_ID;
 use rustc_front::hir;
@@ -778,9 +778,9 @@ impl<'tcx> fmt::Display for ty::TypeVariants<'tcx> {
         match *self {
             TyBool => write!(f, "bool"),
             TyChar => write!(f, "char"),
-            TyInt(t) => write!(f, "{}", ast_util::int_ty_to_string(t)),
+            TyInt(t) => write!(f, "{}", t.ty_to_string()),
-            TyUint(t) => write!(f, "{}", ast_util::uint_ty_to_string(t)),
+            TyUint(t) => write!(f, "{}", t.ty_to_string()),
-            TyFloat(t) => write!(f, "{}", ast_util::float_ty_to_string(t)),
+            TyFloat(t) => write!(f, "{}", t.ty_to_string()),
             TyBox(typ) => write!(f, "Box<{}>",  typ),
             TyRawPtr(ref tm) => {
                 write!(f, "*{} {}", match tm.mutbl {

src/librustc_trans/trans/debuginfo/metadata.rs

@@ -46,7 +46,7 @@ use std::rc::Rc;
 use syntax;
 use syntax::util::interner::Interner;
 use syntax::codemap::Span;
-use syntax::{ast, ast_util, codemap};
+use syntax::{ast, codemap};
 use syntax::parse::token;
 
 
@@ -936,13 +936,13 @@ fn basic_type_metadata<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
         ty::TyBool => ("bool", DW_ATE_boolean),
         ty::TyChar => ("char", DW_ATE_unsigned_char),
         ty::TyInt(int_ty) => {
-            (ast_util::int_ty_to_string(int_ty), DW_ATE_signed)
+            (int_ty.ty_to_string(), DW_ATE_signed)
         },
         ty::TyUint(uint_ty) => {
-            (ast_util::uint_ty_to_string(uint_ty), DW_ATE_unsigned)
+            (uint_ty.ty_to_string(), DW_ATE_unsigned)
         },
         ty::TyFloat(float_ty) => {
-            (ast_util::float_ty_to_string(float_ty), DW_ATE_float)
+            (float_ty.ty_to_string(), DW_ATE_float)
         },
         _ => cx.sess().bug("debuginfo::basic_type_metadata - t is invalid type")
     };

src/librustc_trans/trans/debuginfo/type_names.rs

@@ -19,7 +19,6 @@ use middle::subst::{self, Substs};
 use middle::ty::{self, Ty};
 
 use rustc_front::hir;
-use syntax::ast_util;
 
 // Compute the name of the type as it should be stored in debuginfo. Does not do
 // any caching, i.e. calling the function twice with the same type will also do
@@ -44,9 +43,9 @@ pub fn push_debuginfo_type_name<'a, 'tcx>(cx: &CrateContext<'a, 'tcx>,
         ty::TyBool => output.push_str("bool"),
         ty::TyChar => output.push_str("char"),
         ty::TyStr => output.push_str("str"),
-        ty::TyInt(int_ty) => output.push_str(ast_util::int_ty_to_string(int_ty)),
+        ty::TyInt(int_ty) => output.push_str(int_ty.ty_to_string()),
-        ty::TyUint(uint_ty) => output.push_str(ast_util::uint_ty_to_string(uint_ty)),
+        ty::TyUint(uint_ty) => output.push_str(uint_ty.ty_to_string()),
-        ty::TyFloat(float_ty) => output.push_str(ast_util::float_ty_to_string(float_ty)),
+        ty::TyFloat(float_ty) => output.push_str(float_ty.ty_to_string()),
         ty::TyStruct(def, substs) |
         ty::TyEnum(def, substs) => {
             push_item_name(cx, def.did, qualified, output);

src/librustc_trans/trans/expr.rs

@@ -83,7 +83,7 @@ use trans::type_::Type;
 use rustc_front;
 use rustc_front::hir;
 
-use syntax::{ast, ast_util, codemap};
+use syntax::{ast, codemap};
 use syntax::parse::token::InternedString;
 use syntax::ptr::P;
 use syntax::parse::token;
@@ -2622,7 +2622,7 @@ fn expr_kind(tcx: &ty::ctxt, expr: &hir::Expr) -> ExprKind {
             ExprKind::RvalueDps
         }
 
-        hir::ExprLit(ref lit) if ast_util::lit_is_str(&**lit) => {
+        hir::ExprLit(ref lit) if lit.node.is_str() => {
             ExprKind::RvalueDps
         }
 

src/libsyntax/ast.rs

@@ -48,7 +48,6 @@ pub use self::PathParameters::*;
 use attr::ThinAttributes;
 use codemap::{Span, Spanned, DUMMY_SP, ExpnId};
 use abi::Abi;
-use ast_util;
 use ext::base;
 use ext::tt::macro_parser;
 use owned_slice::OwnedSlice;
@@ -427,6 +426,19 @@ impl Generics {
     }
 }
 
+impl Default for Generics {
+    fn default() ->  Generics {
+        Generics {
+            lifetimes: Vec::new(),
+            ty_params: OwnedSlice::empty(),
+            where_clause: WhereClause {
+                id: DUMMY_NODE_ID,
+                predicates: Vec::new(),
+            }
+        }
+    }
+}
+
 /// A `where` clause in a definition
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct WhereClause {
@@ -657,6 +669,57 @@ pub enum BinOp_ {
     BiGt,
 }
 
+impl BinOp_ {
+    pub fn to_string(&self) -> &'static str {
+        match *self {
+            BiAdd => "+",
+            BiSub => "-",
+            BiMul => "*",
+            BiDiv => "/",
+            BiRem => "%",
+            BiAnd => "&&",
+            BiOr => "||",
+            BiBitXor => "^",
+            BiBitAnd => "&",
+            BiBitOr => "|",
+            BiShl => "<<",
+            BiShr => ">>",
+            BiEq => "==",
+            BiLt => "<",
+            BiLe => "<=",
+            BiNe => "!=",
+            BiGe => ">=",
+            BiGt => ">"
+        }
+    }
+    pub fn lazy(&self) -> bool {
+        match *self {
+            BiAnd | BiOr => true,
+            _ => false
+        }
+    }
+
+    pub fn is_shift(&self) -> bool {
+        match *self {
+            BiShl | BiShr => true,
+            _ => false
+        }
+    }
+    pub fn is_comparison(&self) -> bool {
+        match *self {
+            BiEq | BiLt | BiLe | BiNe | BiGt | BiGe =>
+            true,
+            BiAnd | BiOr | BiAdd | BiSub | BiMul | BiDiv | BiRem |
+            BiBitXor | BiBitAnd | BiBitOr | BiShl | BiShr =>
+            false,
+        }
+    }
+    /// Returns `true` if the binary operator takes its arguments by value
+    pub fn is_by_value(&self) -> bool {
+        !BinOp_::is_comparison(self)
+    }
+}
+
 pub type BinOp = Spanned<BinOp_>;
 
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
@@ -669,13 +732,31 @@ pub enum UnOp {
     UnNeg
 }
 
+impl UnOp {
+    /// Returns `true` if the unary operator takes its argument by value
+    pub fn is_by_value(u: UnOp) -> bool {
+        match u {
+            UnNeg | UnNot => true,
+            _ => false,
+        }
+    }
+
+    pub fn to_string(op: UnOp) -> &'static str {
+        match op {
+            UnDeref => "*",
+            UnNot => "!",
+            UnNeg => "-",
+        }
+    }
+}
+
 /// A statement
 pub type Stmt = Spanned<Stmt_>;
 
 impl fmt::Debug for Stmt {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "stmt({}: {})",
-               ast_util::stmt_id(self)
+               self.node.id()
                    .map_or(Cow::Borrowed("<macro>"),|id|Cow::Owned(id.to_string())),
                pprust::stmt_to_string(self))
     }
@@ -697,6 +778,15 @@ pub enum Stmt_ {
 }
 
 impl Stmt_ {
+    pub fn id(&self) -> Option<NodeId> {
+        match *self {
+            StmtDecl(_, id) => Some(id),
+            StmtExpr(_, id) => Some(id),
+            StmtSemi(_, id) => Some(id),
+            StmtMac(..) => None,
+        }
+    }
+
     pub fn attrs(&self) -> &[Attribute] {
         match *self {
             StmtDecl(ref d, _) => d.attrs(),
@@ -1226,6 +1316,16 @@ pub enum Lit_ {
     LitBool(bool),
 }
 
+impl Lit_ {
+    /// Returns true if this literal is a string and false otherwise.
+    pub fn is_str(&self) -> bool {
+        match *self {
+            LitStr(..) => true,
+            _ => false,
+        }
+    }
+}
+
 // NB: If you change this, you'll probably want to change the corresponding
 // type structure in middle/ty.rs as well.
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
@@ -1301,11 +1401,37 @@ impl fmt::Debug for IntTy {
 
 impl fmt::Display for IntTy {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", ast_util::int_ty_to_string(*self))
+        write!(f, "{}", self.ty_to_string())
     }
 }
 
 impl IntTy {
+    pub fn ty_to_string(&self) -> &'static str {
+        match *self {
+            TyIs => "isize",
+            TyI8 => "i8",
+            TyI16 => "i16",
+            TyI32 => "i32",
+            TyI64 => "i64"
+        }
+    }
+
+    pub fn val_to_string(&self, val: i64) -> String {
+        // cast to a u64 so we can correctly print INT64_MIN. All integral types
+        // are parsed as u64, so we wouldn't want to print an extra negative
+        // sign.
+        format!("{}{}", val as u64, self.ty_to_string())
+    }
+
+    pub fn ty_max(&self) -> u64 {
+        match *self {
+            TyI8 => 0x80,
+            TyI16 => 0x8000,
+            TyIs | TyI32 => 0x80000000, // actually ni about TyIs
+            TyI64 => 0x8000000000000000
+        }
+    }
+
     pub fn bit_width(&self) -> Option<usize> {
         Some(match *self {
             TyIs => return None,
@@ -1327,6 +1453,29 @@ pub enum UintTy {
 }
 
 impl UintTy {
+    pub fn ty_to_string(&self) -> &'static str {
+        match *self {
+            TyUs => "usize",
+            TyU8 => "u8",
+            TyU16 => "u16",
+            TyU32 => "u32",
+            TyU64 => "u64"
+        }
+    }
+
+    pub fn val_to_string(&self, val: u64) -> String {
+        format!("{}{}", val, self.ty_to_string())
+    }
+
+    pub fn ty_max(&self) -> u64 {
+        match *self {
+            TyU8 => 0xff,
+            TyU16 => 0xffff,
+            TyUs | TyU32 => 0xffffffff, // actually ni about TyUs
+            TyU64 => 0xffffffffffffffff
+        }
+    }
+
     pub fn bit_width(&self) -> Option<usize> {
         Some(match *self {
             TyUs => return None,
@@ -1346,7 +1495,7 @@ impl fmt::Debug for UintTy {
 
 impl fmt::Display for UintTy {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", ast_util::uint_ty_to_string(*self))
+        write!(f, "{}", self.ty_to_string())
     }
 }
 
@@ -1364,11 +1513,18 @@ impl fmt::Debug for FloatTy {
 
 impl fmt::Display for FloatTy {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", ast_util::float_ty_to_string(*self))
+        write!(f, "{}", self.ty_to_string())
     }
 }
 
 impl FloatTy {
+    pub fn ty_to_string(&self) -> &'static str {
+        match *self {
+            TyF32 => "f32",
+            TyF64 => "f64",
+        }
+    }
+
     pub fn bit_width(&self) -> usize {
         match *self {
             TyF32 => 32,

src/libsyntax/ast_util.rs

@@ -10,7 +10,6 @@
 
 use ast::*;
 use ast;
-use ast_util;
 use codemap;
 use codemap::Span;
 use owned_slice::OwnedSlice;
@@ -28,144 +27,10 @@ pub fn path_name_i(idents: &[Ident]) -> String {
     idents.iter().map(|i| i.to_string()).collect::<Vec<String>>().join("::")
 }
 
-pub fn stmt_id(s: &Stmt) -> Option<NodeId> {
-    match s.node {
-      StmtDecl(_, id) => Some(id),
-      StmtExpr(_, id) => Some(id),
-      StmtSemi(_, id) => Some(id),
-      StmtMac(..) => None,
-    }
-}
-
-pub fn binop_to_string(op: BinOp_) -> &'static str {
-    match op {
-        BiAdd => "+",
-        BiSub => "-",
-        BiMul => "*",
-        BiDiv => "/",
-        BiRem => "%",
-        BiAnd => "&&",
-        BiOr => "||",
-        BiBitXor => "^",
-        BiBitAnd => "&",
-        BiBitOr => "|",
-        BiShl => "<<",
-        BiShr => ">>",
-        BiEq => "==",
-        BiLt => "<",
-        BiLe => "<=",
-        BiNe => "!=",
-        BiGe => ">=",
-        BiGt => ">"
-    }
-}
-
-pub fn lazy_binop(b: BinOp_) -> bool {
-    match b {
-      BiAnd => true,
-      BiOr => true,
-      _ => false
-    }
-}
-
-pub fn is_shift_binop(b: BinOp_) -> bool {
-    match b {
-      BiShl => true,
-      BiShr => true,
-      _ => false
-    }
-}
-
-pub fn is_comparison_binop(b: BinOp_) -> bool {
-    match b {
-        BiEq | BiLt | BiLe | BiNe | BiGt | BiGe =>
-            true,
-        BiAnd | BiOr | BiAdd | BiSub | BiMul | BiDiv | BiRem |
-        BiBitXor | BiBitAnd | BiBitOr | BiShl | BiShr =>
-            false,
-    }
-}
-
-/// Returns `true` if the binary operator takes its arguments by value
-pub fn is_by_value_binop(b: BinOp_) -> bool {
-    !is_comparison_binop(b)
-}
-
-/// Returns `true` if the unary operator takes its argument by value
-pub fn is_by_value_unop(u: UnOp) -> bool {
-    match u {
-        UnNeg | UnNot => true,
-        _ => false,
-    }
-}
-
-pub fn unop_to_string(op: UnOp) -> &'static str {
-    match op {
-        UnDeref => "*",
-        UnNot => "!",
-        UnNeg => "-",
-    }
-}
-
 pub fn is_path(e: P<Expr>) -> bool {
     match e.node { ExprPath(..) => true, _ => false }
 }
 
-pub fn int_ty_to_string(t: IntTy) -> &'static str {
-    match t {
-        TyIs => "isize",
-        TyI8 => "i8",
-        TyI16 => "i16",
-        TyI32 => "i32",
-        TyI64 => "i64"
-    }
-}
-
-pub fn int_val_to_string(t: IntTy, val: i64) -> String {
-    // cast to a u64 so we can correctly print INT64_MIN. All integral types
-    // are parsed as u64, so we wouldn't want to print an extra negative
-    // sign.
-    format!("{}{}", val as u64, int_ty_to_string(t))
-}
-
-pub fn int_ty_max(t: IntTy) -> u64 {
-    match t {
-        TyI8 => 0x80,
-        TyI16 => 0x8000,
-        TyIs | TyI32 => 0x80000000, // actually ni about TyIs
-        TyI64 => 0x8000000000000000
-    }
-}
-
-pub fn uint_ty_to_string(t: UintTy) -> &'static str {
-    match t {
-        TyUs => "usize",
-        TyU8 => "u8",
-        TyU16 => "u16",
-        TyU32 => "u32",
-        TyU64 => "u64"
-    }
-}
-
-pub fn uint_val_to_string(t: UintTy, val: u64) -> String {
-    format!("{}{}", val, uint_ty_to_string(t))
-}
-
-pub fn uint_ty_max(t: UintTy) -> u64 {
-    match t {
-        TyU8 => 0xff,
-        TyU16 => 0xffff,
-        TyUs | TyU32 => 0xffffffff, // actually ni about TyUs
-        TyU64 => 0xffffffffffffffff
-    }
-}
-
-pub fn float_ty_to_string(t: FloatTy) -> &'static str {
-    match t {
-        TyF32 => "f32",
-        TyF64 => "f64",
-    }
-}
 
 // convert a span and an identifier to the corresponding
 // 1-segment path
@@ -236,17 +101,6 @@ pub fn struct_field_visibility(field: ast::StructField) -> Visibility {
     }
 }
 
-pub fn empty_generics() -> Generics {
-    Generics {
-        lifetimes: Vec::new(),
-        ty_params: OwnedSlice::empty(),
-        where_clause: WhereClause {
-            id: DUMMY_NODE_ID,
-            predicates: Vec::new(),
-        }
-    }
-}
-
 // ______________________________________________________________________
 // Enumerating the IDs which appear in an AST
 
@@ -351,7 +205,7 @@ impl<'a, 'v, O: IdVisitingOperation> Visitor<'v> for IdVisitor<'a, O> {
 
     fn visit_stmt(&mut self, statement: &Stmt) {
         self.operation
-            .visit_id(ast_util::stmt_id(statement).expect("attempted to visit unexpanded stmt"));
+            .visit_id(statement.node.id().expect("attempted to visit unexpanded stmt"));
         visit::walk_stmt(self, statement)
     }
 
@@ -519,14 +373,6 @@ pub fn segments_name_eq(a : &[ast::PathSegment], b : &[ast::PathSegment]) -> boo
     })
 }
 
-/// Returns true if this literal is a string and false otherwise.
-pub fn lit_is_str(lit: &Lit) -> bool {
-    match lit.node {
-        LitStr(..) => true,
-        _ => false,
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use ast::*;

src/libsyntax/ext/build.rs

@@ -11,7 +11,6 @@
 use abi;
 use ast::{Ident, Generics, Expr};
 use ast;
-use ast_util;
 use attr;
 use codemap::{Span, respan, Spanned, DUMMY_SP, Pos};
 use ext::base::ExtCtxt;
@@ -991,7 +990,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
             name,
             inputs,
             output,
-            ast_util::empty_generics(),
+            Generics::default(),
             body)
     }
 
@@ -1029,7 +1028,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     fn item_enum(&self, span: Span, name: Ident,
                  enum_definition: ast::EnumDef) -> P<ast::Item> {
         self.item_enum_poly(span, name, enum_definition,
-                            ast_util::empty_generics())
+                            Generics::default())
     }
 
     fn item_struct(&self, span: Span, name: Ident,
@@ -1038,7 +1037,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
             span,
             name,
             struct_def,
-            ast_util::empty_generics()
+            Generics::default()
         )
     }
 
@@ -1086,7 +1085,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     }
 
     fn item_ty(&self, span: Span, name: Ident, ty: P<ast::Ty>) -> P<ast::Item> {
-        self.item_ty_poly(span, name, ty, ast_util::empty_generics())
+        self.item_ty_poly(span, name, ty, Generics::default())
     }
 
     fn attribute(&self, sp: Span, mi: P<ast::MetaItem>) -> ast::Attribute {

src/libsyntax/parse/parser.rs

@@ -2872,7 +2872,7 @@ impl<'a> Parser<'a> {
     fn check_no_chained_comparison(&mut self, lhs: &Expr, outer_op: &AssocOp) {
         debug_assert!(outer_op.is_comparison());
         match lhs.node {
-            ExprBinary(op, _, _) if ast_util::is_comparison_binop(op.node) => {
+            ExprBinary(op, _, _) if op.node.is_comparison() => {
                 // respan to include both operators
                 let op_span = mk_sp(op.span.lo, self.span.hi);
                 self.span_err(op_span,
@@ -4000,7 +4000,7 @@ impl<'a> Parser<'a> {
                 }
             })
         } else {
-            Ok(ast_util::empty_generics())
+            Ok(ast::Generics::default())
         }
     }
 

src/libsyntax/print/pprust.rs

@@ -15,7 +15,6 @@ use ast::{self, TokenTree};
 use ast::{RegionTyParamBound, TraitTyParamBound, TraitBoundModifier};
 use ast::Attribute;
 use attr::ThinAttributesExt;
-use ast_util;
 use util::parser::AssocOp;
 use attr;
 use owned_slice::OwnedSlice;
@@ -649,15 +648,15 @@ pub trait PrintState<'a> {
                 match t {
                     ast::SignedIntLit(st, ast::Plus) => {
                         word(self.writer(),
-                             &ast_util::int_val_to_string(st, i as i64))
+                             &st.val_to_string(i as i64))
                     }
                     ast::SignedIntLit(st, ast::Minus) => {
-                        let istr = ast_util::int_val_to_string(st, -(i as i64));
+                        let istr = st.val_to_string(-(i as i64));
                         word(self.writer(),
                              &format!("-{}", istr))
                     }
                     ast::UnsignedIntLit(ut) => {
-                        word(self.writer(), &ast_util::uint_val_to_string(ut, i))
+                        word(self.writer(), &ut.val_to_string(i))
                     }
                     ast::UnsuffixedIntLit(ast::Plus) => {
                         word(self.writer(), &format!("{}", i))
@@ -672,7 +671,7 @@ pub trait PrintState<'a> {
                      &format!(
                          "{}{}",
                          &f,
-                         &ast_util::float_ty_to_string(t)))
+                         t.ty_to_string()))
             }
             ast::LitFloatUnsuffixed(ref f) => word(self.writer(), &f[..]),
             ast::LitBool(val) => {
@@ -1528,7 +1527,7 @@ impl<'a> State<'a> {
 
     pub fn print_variant(&mut self, v: &ast::Variant) -> io::Result<()> {
         try!(self.head(""));
-        let generics = ast_util::empty_generics();
+        let generics = ast::Generics::default();
         try!(self.print_struct(&v.node.data, &generics, v.node.name, v.span, false));
         match v.node.disr_expr {
             Some(ref d) => {
@@ -1948,7 +1947,7 @@ impl<'a> State<'a> {
             try!(self.print_expr(lhs));
         }
         try!(space(&mut self.s));
-        try!(self.word_space(ast_util::binop_to_string(op.node)));
+        try!(self.word_space(op.node.to_string()));
         if self.check_expr_bin_needs_paren(rhs, op) {
             self.print_expr_maybe_paren(rhs)
         } else {
@@ -1959,7 +1958,7 @@ impl<'a> State<'a> {
     fn print_expr_unary(&mut self,
                         op: ast::UnOp,
                         expr: &ast::Expr) -> io::Result<()> {
-        try!(word(&mut self.s, ast_util::unop_to_string(op)));
+        try!(word(&mut self.s, ast::UnOp::to_string(op)));
         self.print_expr_maybe_paren(expr)
     }
 
@@ -2151,7 +2150,7 @@ impl<'a> State<'a> {
             ast::ExprAssignOp(op, ref lhs, ref rhs) => {
                 try!(self.print_expr(&**lhs));
                 try!(space(&mut self.s));
-                try!(word(&mut self.s, ast_util::binop_to_string(op.node)));
+                try!(word(&mut self.s, op.node.to_string()));
                 try!(self.word_space("="));
                 try!(self.print_expr(&**rhs));
             }
@@ -3159,7 +3158,7 @@ mod tests {
             output: ast::DefaultReturn(codemap::DUMMY_SP),
             variadic: false
         };
-        let generics = ast_util::empty_generics();
+        let generics = ast::Generics::default();
         assert_eq!(fun_to_string(&decl, ast::Unsafety::Normal,
                                  ast::Constness::NotConst,
                                  abba_ident,

src/libsyntax/test.rs

@@ -500,7 +500,7 @@ fn mk_main(cx: &mut TestCtxt) -> P<ast::Item> {
     let main = ast::ItemFn(ecx.fn_decl(vec![], main_ret_ty),
                            ast::Unsafety::Normal,
                            ast::Constness::NotConst,
-                           ::abi::Rust, empty_generics(), main_body);
+                           ::abi::Rust, ast::Generics::default(), main_body);
     let main = P(ast::Item {
         ident: token::str_to_ident("main"),
         attrs: vec![main_attr],