Only suggest .copied() for Option right now

1 files changed, 8 insertions, 5 deletions

diff --git a/clippy_lints/src/map_clone.rs b/clippy_lints/src/map_clone.rs
index cb504e651e4..1a9334ae488 100644
--- a/clippy_lints/src/map_clone.rs
+++ b/clippy_lints/src/map_clone.rs
@@ -1,6 +1,6 @@
 use crate::utils::paths;
 use crate::utils::{
-    in_macro, match_trait_method, match_type, remove_blocks, snippet_with_applicability, span_lint_and_sugg, is_copy
+    in_macro, is_copy, match_trait_method, match_type, remove_blocks, snippet_with_applicability, span_lint_and_sugg,
 };
 use if_chain::if_chain;
 use rustc::hir;
@@ -63,7 +63,8 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Pass {
             if args.len() == 2;
             if method.ident.as_str() == "map";
             let ty = cx.tables.expr_ty(&args[0]);
-            if match_type(cx, ty, &paths::OPTION) || match_trait_method(cx, e, &paths::ITERATOR);
+            let is_option = match_type(cx, ty, &paths::OPTION);
+            if is_option || match_trait_method(cx, e, &paths::ITERATOR);
             if let hir::ExprKind::Closure(_, _, body_id, _, _) = args[1].node;
             let closure_body = cx.tcx.hir().body(body_id);
             let closure_expr = remove_blocks(&closure_body.value);
@@ -73,14 +74,16 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Pass {
                         hir::BindingAnnotation::Unannotated, .., name, None
                     ) = inner.node {
                         if ident_eq(name, closure_expr) {
-                            lint(cx, e.span, args[0].span, true);
+                            // FIXME When Iterator::copied() stabilizes we can remove is_option
+                            // from here and the other lint() calls
+                            lint(cx, e.span, args[0].span, is_option);
                         }
                     },
                     hir::PatKind::Binding(hir::BindingAnnotation::Unannotated, .., name, None) => {
                         match closure_expr.node {
                             hir::ExprKind::Unary(hir::UnOp::UnDeref, ref inner) => {
                                 if ident_eq(name, inner) && !cx.tables.expr_ty(inner).is_box() {
-                                    lint(cx, e.span, args[0].span, true);
+                                    lint(cx, e.span, args[0].span, is_option);
                                 }
                             },
                             hir::ExprKind::MethodCall(ref method, _, ref obj) => {
@@ -90,7 +93,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Pass {
                                     let obj_ty = cx.tables.expr_ty(&obj[0]);
                                     if let ty::Ref(_, ty, _) = obj_ty.sty {
                                         let copy = is_copy(cx, ty);
-                                        lint(cx, e.span, args[0].span, copy);
+                                        lint(cx, e.span, args[0].span, is_option && copy);
                                     } else {
                                         lint_needless_cloning(cx, e.span, args[0].span);
                                     }