From f826193aec2d58f64c4592818dd2d855a5bbc597 Mon Sep 17 00:00:00 2001
From: Samuel Tardieu <sam@rfc1149.net>
Date: Wed, 12 Feb 2025 20:44:22 +0100
Subject: [PATCH] `unnecessary_map_or`: do not consume the non-`Copy`
 comparison value

---
 .../src/methods/unnecessary_map_or.rs         |  6 +++--
 tests/ui/unnecessary_map_or.fixed             |  6 +++++
 tests/ui/unnecessary_map_or.rs                |  6 +++++
 tests/ui/unnecessary_map_or.stderr            | 26 ++++++++++++++++++-
 4 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/clippy_lints/src/methods/unnecessary_map_or.rs b/clippy_lints/src/methods/unnecessary_map_or.rs
index 6dea1506d0e3..c307e8c951d0 100644
--- a/clippy_lints/src/methods/unnecessary_map_or.rs
+++ b/clippy_lints/src/methods/unnecessary_map_or.rs
@@ -4,7 +4,7 @@ use clippy_utils::diagnostics::span_lint_and_then;
 use clippy_utils::eager_or_lazy::switch_to_eager_eval;
 use clippy_utils::msrvs::{self, Msrv};
 use clippy_utils::sugg::{Sugg, make_binop};
-use clippy_utils::ty::{get_type_diagnostic_name, implements_trait};
+use clippy_utils::ty::{get_type_diagnostic_name, implements_trait, is_copy};
 use clippy_utils::visitors::is_local_used;
 use clippy_utils::{get_parent_expr, is_from_proc_macro, path_to_local_id};
 use rustc_ast::LitKind::Bool;
@@ -81,9 +81,11 @@ pub(super) fn check<'a>(
             && (path_to_local_id(l, hir_id) ^ path_to_local_id(r, hir_id))
             && !is_local_used(cx, non_binding_location, hir_id)
             && let typeck_results = cx.typeck_results()
-            && typeck_results.expr_ty(l) == typeck_results.expr_ty(r)
+            && let l_ty = typeck_results.expr_ty(l)
+            && l_ty == typeck_results.expr_ty(r)
             && let Some(partial_eq) = cx.tcx.get_diagnostic_item(sym::PartialEq)
             && implements_trait(cx, recv_ty, partial_eq, &[recv_ty.into()])
+            && is_copy(cx, l_ty)
     {
         let wrap = variant.variant_name();
 
diff --git a/tests/ui/unnecessary_map_or.fixed b/tests/ui/unnecessary_map_or.fixed
index 5a6e77a06b8f..27532373a7b9 100644
--- a/tests/ui/unnecessary_map_or.fixed
+++ b/tests/ui/unnecessary_map_or.fixed
@@ -99,3 +99,9 @@ impl std::ops::Deref for S {
 fn with_deref(o: &S) -> bool {
     o.is_none_or(|n| n > 5)
 }
+
+fn issue14201(a: Option<String>, b: Option<String>, s: &String) -> bool {
+    let x = a.is_some_and(|a| a == *s);
+    let y = b.is_none_or(|b| b == *s);
+    x && y
+}
diff --git a/tests/ui/unnecessary_map_or.rs b/tests/ui/unnecessary_map_or.rs
index 5ba63121659f..6496defe1300 100644
--- a/tests/ui/unnecessary_map_or.rs
+++ b/tests/ui/unnecessary_map_or.rs
@@ -102,3 +102,9 @@ impl std::ops::Deref for S {
 fn with_deref(o: &S) -> bool {
     o.map_or(true, |n| n > 5)
 }
+
+fn issue14201(a: Option<String>, b: Option<String>, s: &String) -> bool {
+    let x = a.map_or(false, |a| a == *s);
+    let y = b.map_or(true, |b| b == *s);
+    x && y
+}
diff --git a/tests/ui/unnecessary_map_or.stderr b/tests/ui/unnecessary_map_or.stderr
index 2ae327f0bf88..f672f55dd04d 100644
--- a/tests/ui/unnecessary_map_or.stderr
+++ b/tests/ui/unnecessary_map_or.stderr
@@ -287,5 +287,29 @@ LL -     o.map_or(true, |n| n > 5)
 LL +     o.is_none_or(|n| n > 5)
    |
 
-error: aborting due to 24 previous errors
+error: this `map_or` can be simplified
+  --> tests/ui/unnecessary_map_or.rs:107:13
+   |
+LL |     let x = a.map_or(false, |a| a == *s);
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: use is_some_and instead
+   |
+LL -     let x = a.map_or(false, |a| a == *s);
+LL +     let x = a.is_some_and(|a| a == *s);
+   |
+
+error: this `map_or` can be simplified
+  --> tests/ui/unnecessary_map_or.rs:108:13
+   |
+LL |     let y = b.map_or(true, |b| b == *s);
+   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: use is_none_or instead
+   |
+LL -     let y = b.map_or(true, |b| b == *s);
+LL +     let y = b.is_none_or(|b| b == *s);
+   |
+
+error: aborting due to 26 previous errors