hir: Remove unnecessary HirId from hir::Let

It has 1-to-1 correspondence to its expression id.

Also remove mostly useless `visit_let_expr`.

compiler/rustc_ast_lowering/src/expr.rs

@@ -153,7 +153,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
                 }
                 ExprKind::Let(pat, scrutinee, span, is_recovered) => {
                     hir::ExprKind::Let(self.arena.alloc(hir::Let {
-                        hir_id: self.next_id(),
                         span: self.lower_span(*span),
                         pat: self.lower_pat(pat),
                         ty: None,

compiler/rustc_hir/src/hir.rs

@@ -1273,7 +1273,6 @@ pub struct Arm<'hir> {
 /// desugaring to if-let. Only let-else supports the type annotation at present.
 #[derive(Debug, Clone, Copy, HashStable_Generic)]
 pub struct Let<'hir> {
-    pub hir_id: HirId,
     pub span: Span,
     pub pat: &'hir Pat<'hir>,
     pub ty: Option<&'hir Ty<'hir>>,

compiler/rustc_hir/src/intravisit.rs

@@ -341,9 +341,6 @@ pub trait Visitor<'v>: Sized {
     fn visit_expr(&mut self, ex: &'v Expr<'v>) {
         walk_expr(self, ex)
     }
-    fn visit_let_expr(&mut self, lex: &'v Let<'v>) {
-        walk_let_expr(self, lex)
-    }
     fn visit_expr_field(&mut self, field: &'v ExprField<'v>) {
         walk_expr_field(self, field)
     }
@@ -729,7 +726,12 @@ pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr<'v>)
         ExprKind::DropTemps(ref subexpression) => {
             visitor.visit_expr(subexpression);
         }
-        ExprKind::Let(ref let_expr) => visitor.visit_let_expr(let_expr),
+        ExprKind::Let(Let { span: _, pat, ty, init, is_recovered: _ }) => {
+            // match the visit order in walk_local
+            visitor.visit_expr(init);
+            visitor.visit_pat(pat);
+            walk_list!(visitor, visit_ty, ty);
+        }
         ExprKind::If(ref cond, ref then, ref else_opt) => {
             visitor.visit_expr(cond);
             visitor.visit_expr(then);
@@ -806,14 +808,6 @@ pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr<'v>)
     }
 }
 
-pub fn walk_let_expr<'v, V: Visitor<'v>>(visitor: &mut V, let_expr: &'v Let<'v>) {
-    // match the visit order in walk_local
-    visitor.visit_expr(let_expr.init);
-    visitor.visit_id(let_expr.hir_id);
-    visitor.visit_pat(let_expr.pat);
-    walk_list!(visitor, visit_ty, let_expr.ty);
-}
-
 pub fn walk_expr_field<'v, V: Visitor<'v>>(visitor: &mut V, field: &'v ExprField<'v>) {
     visitor.visit_id(field.hir_id);
     visitor.visit_ident(field.ident);

compiler/rustc_hir_typeck/src/expr.rs

@@ -320,7 +320,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
             ExprKind::Ret(ref expr_opt) => self.check_expr_return(expr_opt.as_deref(), expr),
             ExprKind::Become(call) => self.check_expr_become(call, expr),
-            ExprKind::Let(let_expr) => self.check_expr_let(let_expr),
+            ExprKind::Let(let_expr) => self.check_expr_let(let_expr, expr.hir_id),
             ExprKind::Loop(body, _, source, _) => {
                 self.check_expr_loop(body, source, expected, expr)
             }
@@ -1259,12 +1259,12 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
     }
 
-    pub(super) fn check_expr_let(&self, let_expr: &'tcx hir::Let<'tcx>) -> Ty<'tcx> {
+    pub(super) fn check_expr_let(&self, let_expr: &'tcx hir::Let<'tcx>, hir_id: HirId) -> Ty<'tcx> {
         // for let statements, this is done in check_stmt
         let init = let_expr.init;
         self.warn_if_unreachable(init.hir_id, init.span, "block in `let` expression");
         // otherwise check exactly as a let statement
-        self.check_decl(let_expr.into());
+        self.check_decl((let_expr, hir_id).into());
         // but return a bool, for this is a boolean expression
         if let Some(error_guaranteed) = let_expr.is_recovered {
             self.set_tainted_by_errors(error_guaranteed);

compiler/rustc_hir_typeck/src/gather_locals.rs

@@ -48,9 +48,9 @@ impl<'a> From<&'a hir::Local<'a>> for Declaration<'a> {
     }
 }
 
-impl<'a> From<&'a hir::Let<'a>> for Declaration<'a> {
-    fn from(let_expr: &'a hir::Let<'a>) -> Self {
-        let hir::Let { hir_id, pat, ty, span, init, is_recovered: _ } = *let_expr;
+impl<'a> From<(&'a hir::Let<'a>, hir::HirId)> for Declaration<'a> {
+    fn from((let_expr, hir_id): (&'a hir::Let<'a>, hir::HirId)) -> Self {
+        let hir::Let { pat, ty, span, init, is_recovered: _ } = *let_expr;
         Declaration { hir_id, pat, ty, span, init: Some(init), origin: DeclOrigin::LetExpr }
     }
 }
@@ -125,9 +125,11 @@ impl<'a, 'tcx> Visitor<'tcx> for GatherLocalsVisitor<'a, 'tcx> {
         intravisit::walk_local(self, local)
     }
 
-    fn visit_let_expr(&mut self, let_expr: &'tcx hir::Let<'tcx>) {
-        self.declare(let_expr.into());
-        intravisit::walk_let_expr(self, let_expr);
+    fn visit_expr(&mut self, expr: &'tcx hir::Expr<'tcx>) {
+        if let hir::ExprKind::Let(let_expr) = expr.kind {
+            self.declare((let_expr, expr.hir_id).into());
+        }
+        intravisit::walk_expr(self, expr)
     }
 
     fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {

compiler/rustc_passes/src/hir_stats.rs

@@ -328,11 +328,6 @@ impl<'v> hir_visit::Visitor<'v> for StatCollector<'v> {
         hir_visit::walk_expr(self, e)
     }
 
-    fn visit_let_expr(&mut self, lex: &'v hir::Let<'v>) {
-        self.record("Let", Id::Node(lex.hir_id), lex);
-        hir_visit::walk_let_expr(self, lex)
-    }
-
     fn visit_expr_field(&mut self, f: &'v hir::ExprField<'v>) {
         self.record("ExprField", Id::Node(f.hir_id), f);
         hir_visit::walk_expr_field(self, f)