hir: remove NodeId from Field

Author: ljedrz

src/librustc/hir/lowering.rs

@@ -2767,10 +2767,9 @@ impl<'a> LoweringContext<'a> {
     }
 
     fn lower_field(&mut self, f: &Field) -> hir::Field {
-        let LoweredNodeId { node_id, hir_id } = self.next_id();
+        let LoweredNodeId { node_id: _, hir_id } = self.next_id();
 
         hir::Field {
-            id: node_id,
             hir_id,
             ident: f.ident,
             expr: P(self.lower_expr(&f.expr)),
@@ -4801,10 +4800,9 @@ impl<'a> LoweringContext<'a> {
     }
 
     fn field(&mut self, ident: Ident, expr: P<hir::Expr>, span: Span) -> hir::Field {
-        let LoweredNodeId { node_id, hir_id } = self.next_id();
+        let LoweredNodeId { node_id: _, hir_id } = self.next_id();
 
         hir::Field {
-            id: node_id,
             hir_id,
             ident,
             span,

src/librustc/hir/mod.rs

@@ -1229,7 +1229,6 @@ pub enum Guard {
 
 #[derive(Clone, RustcEncodable, RustcDecodable, Debug)]
 pub struct Field {
-    pub id: NodeId,
     pub hir_id: HirId,
     pub ident: Ident,
     pub expr: P<Expr>,

src/librustc/ich/impls_hir.rs

@@ -523,7 +523,6 @@ impl_stable_hash_for!(enum hir::Guard {
 });
 
 impl_stable_hash_for!(struct hir::Field {
-    id -> _,
     hir_id -> _,
     ident,
     expr,