1 files changed, 5 insertions, 19 deletions
diff --git a/src/librustc_ast_lowering/expr.rs b/src/librustc_ast_lowering/expr.rs
index e59cacfffc9..b7894eb145b 100644
--- a/src/librustc_ast_lowering/expr.rs
+++ b/src/librustc_ast_lowering/expr.rs
@@ -9,7 +9,7 @@ use rustc_data_structures::thin_vec::ThinVec;
 use rustc_errors::struct_span_err;
 use rustc_hir as hir;
 use rustc_hir::def::Res;
-use rustc_span::source_map::{respan, DesugaringKind, ForLoopLoc, Span, Spanned};
+use rustc_span::source_map::{respan, DesugaringKind, Span, Spanned};
 use rustc_span::symbol::{sym, Ident, Symbol};
 use rustc_target::asm;
 use std::collections::hash_map::Entry;
@@ -25,7 +25,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
     }
 
     pub(super) fn lower_expr_mut(&mut self, e: &Expr) -> hir::Expr<'hir> {
-        let mut span = e.span;
         ensure_sufficient_stack(|| {
             let kind = match e.kind {
                 ExprKind::Box(ref inner) => hir::ExprKind::Box(self.lower_expr(inner)),
@@ -54,7 +53,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
                     hir::ExprKind::MethodCall(hir_seg, seg.ident.span, args, span)
                 }
                 ExprKind::Binary(binop, ref lhs, ref rhs) => {
-                    span = self.mark_span_with_reason(DesugaringKind::Operator, e.span, None);
                     let binop = self.lower_binop(binop);
                     let lhs = self.lower_expr(lhs);
                     let rhs = self.lower_expr(rhs);
@@ -224,7 +222,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
             hir::Expr {
                 hir_id: self.lower_node_id(e.id),
                 kind,
-                span,
+                span: e.span,
                 attrs: e.attrs.iter().map(|a| self.lower_attr(a)).collect::<Vec<_>>().into(),
             }
         })
@@ -239,7 +237,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
     }
 
     fn lower_binop(&mut self, b: BinOp) -> hir::BinOp {
-        let span = self.mark_span_with_reason(DesugaringKind::Operator, b.span, None);
         Spanned {
             node: match b.node {
                 BinOpKind::Add => hir::BinOpKind::Add,
@@ -261,7 +258,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
                 BinOpKind::Ge => hir::BinOpKind::Ge,
                 BinOpKind::Gt => hir::BinOpKind::Gt,
             },
-            span,
+            span: b.span,
         }
     }
 
@@ -1363,14 +1360,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
         body: &Block,
         opt_label: Option<Label>,
     ) -> hir::Expr<'hir> {
-        let orig_head_span = head.span;
         // expand <head>
         let mut head = self.lower_expr_mut(head);
-        let desugared_span = self.mark_span_with_reason(
-            DesugaringKind::ForLoop(ForLoopLoc::Head),
-            orig_head_span,
-            None,
-        );
+        let desugared_span = self.mark_span_with_reason(DesugaringKind::ForLoop, head.span, None);
         head.span = desugared_span;
 
         let iter = Ident::with_dummy_span(sym::iter);
@@ -1465,16 +1457,10 @@ impl<'hir> LoweringContext<'_, 'hir> {
         // `mut iter => { ... }`
         let iter_arm = self.arm(iter_pat, loop_expr);
 
-        let into_iter_span = self.mark_span_with_reason(
-            DesugaringKind::ForLoop(ForLoopLoc::IntoIter),
-            orig_head_span,
-            None,
-        );
-
         // `match ::std::iter::IntoIterator::into_iter(<head>) { ... }`
         let into_iter_expr = {
             let into_iter_path = &[sym::iter, sym::IntoIterator, sym::into_iter];
-            self.expr_call_std_path(into_iter_span, into_iter_path, arena_vec![self; head])
+            self.expr_call_std_path(desugared_span, into_iter_path, arena_vec![self; head])
         };
 
         let match_expr = self.arena.alloc(self.expr_match(