Handle Option::map_or(true, …) in unnecessary_map_or lint (#13653)

changelog: [`unnecessary_map_or`]: handle `Option::map_or(true, …)`

clippy_lints/src/approx_const.rs

@@ -91,7 +91,7 @@ impl ApproxConstant {
         let s = s.as_str();
         if s.parse::<f64>().is_ok() {
             for &(constant, name, min_digits, msrv) in &KNOWN_CONSTS {
-                if is_approx_const(constant, s, min_digits) && msrv.map_or(true, |msrv| self.msrv.meets(msrv)) {
+                if is_approx_const(constant, s, min_digits) && msrv.is_none_or(|msrv| self.msrv.meets(msrv)) {
                     span_lint_and_help(
                         cx,
                         APPROX_CONSTANT,

clippy_lints/src/assigning_clones.rs

@@ -100,13 +100,13 @@ impl<'tcx> LateLintPass<'tcx> for AssigningClones {
             // TODO: This check currently bails if the local variable has no initializer.
             // That is overly conservative - the lint should fire even if there was no initializer,
             // but the variable has been initialized before `lhs` was evaluated.
-            && path_to_local(lhs).map_or(true, |lhs| local_is_initialized(cx, lhs))
+            && path_to_local(lhs).is_none_or(|lhs| local_is_initialized(cx, lhs))
             && let Some(resolved_impl) = cx.tcx.impl_of_method(resolved_fn.def_id())
             // Derived forms don't implement `clone_from`/`clone_into`.
             // See https://github.com/rust-lang/rust/pull/98445#issuecomment-1190681305
             && !cx.tcx.is_builtin_derived(resolved_impl)
             // Don't suggest calling a function we're implementing.
-            && resolved_impl.as_local().map_or(true, |block_id| {
+            && resolved_impl.as_local().is_none_or(|block_id| {
                 cx.tcx.hir().parent_owner_iter(e.hir_id).all(|(id, _)| id.def_id != block_id)
             })
             && let resolved_assoc_items = cx.tcx.associated_items(resolved_impl)

clippy_lints/src/borrow_deref_ref.rs

@@ -57,7 +57,7 @@ impl<'tcx> LateLintPass<'tcx> for BorrowDerefRef {
             && !addrof_target.span.from_expansion()
             && let ref_ty = cx.typeck_results().expr_ty(deref_target)
             && let ty::Ref(_, inner_ty, Mutability::Not) = ref_ty.kind()
-            && get_parent_expr(cx, e).map_or(true, |parent| {
+            && get_parent_expr(cx, e).is_none_or(|parent| {
                 match parent.kind {
                     // `*&*foo` should lint `deref_addrof` instead.
                     ExprKind::Unary(UnOp::Deref, _) => is_lint_allowed(cx, DEREF_ADDROF, parent.hir_id),

clippy_lints/src/cargo/common_metadata.rs

@@ -43,7 +43,7 @@ fn missing_warning(cx: &LateContext<'_>, package: &cargo_metadata::Package, fiel
 }
 
 fn is_empty_str<T: AsRef<std::ffi::OsStr>>(value: Option<&T>) -> bool {
-    value.map_or(true, |s| s.as_ref().is_empty())
+    value.is_none_or(|s| s.as_ref().is_empty())
 }
 
 fn is_empty_vec(value: &[String]) -> bool {

clippy_lints/src/casts/cast_possible_truncation.rs

@@ -134,7 +134,7 @@ pub(super) fn check(
             };
             let to_nbits = utils::int_ty_to_nbits(cast_to, cx.tcx);
 
-            let cast_from_ptr_size = def.repr().int.map_or(true, |ty| matches!(ty, IntegerType::Pointer(_),));
+            let cast_from_ptr_size = def.repr().int.is_none_or(|ty| matches!(ty, IntegerType::Pointer(_),));
             let suffix = match (cast_from_ptr_size, is_isize_or_usize(cast_to)) {
                 (_, false) if from_nbits > to_nbits => "",
                 (false, true) if from_nbits > 64 => "",

clippy_lints/src/copies.rs

@@ -212,7 +212,7 @@ fn lint_if_same_then_else(cx: &LateContext<'_>, conds: &[&Expr<'_>], blocks: &[&
         .array_windows::<2>()
         .enumerate()
         .fold(true, |all_eq, (i, &[lhs, rhs])| {
-            if eq.eq_block(lhs, rhs) && !contains_let(conds[i]) && conds.get(i + 1).map_or(true, |e| !contains_let(e)) {
+            if eq.eq_block(lhs, rhs) && !contains_let(conds[i]) && conds.get(i + 1).is_none_or(|e| !contains_let(e)) {
                 span_lint_and_note(
                     cx,
                     IF_SAME_THEN_ELSE,
@@ -470,7 +470,7 @@ fn scan_block_for_eq<'tcx>(
                 b.stmts
                     // the bounds check will catch the underflow
                     .get(b.stmts.len().wrapping_sub(offset + 1))
-                    .map_or(true, |s| hash != hash_stmt(cx, s))
+                    .is_none_or(|s| hash != hash_stmt(cx, s))
             })
         })
         .map_or(block.stmts.len() - start_end_eq, |(i, _)| i);

clippy_lints/src/dereference.rs

@@ -452,7 +452,7 @@ impl<'tcx> LateLintPass<'tcx> for Dereferencing<'tcx> {
                             ));
                         } else if stability.is_deref_stable()
                             // Auto-deref doesn't combine with other adjustments
-                            && next_adjust.map_or(true, |a| matches!(a.kind, Adjust::Deref(_) | Adjust::Borrow(_)))
+                            && next_adjust.is_none_or(|a| matches!(a.kind, Adjust::Deref(_) | Adjust::Borrow(_)))
                             && iter.all(|a| matches!(a.kind, Adjust::Deref(_) | Adjust::Borrow(_)))
                         {
                             self.state = Some((State::Borrow { mutability }, StateData {

clippy_lints/src/eta_reduction.rs

@@ -276,7 +276,7 @@ fn check_inputs(
             && typeck
                 .expr_adjustments(arg)
                 .last()
-                .map_or(true, |a| a.target == typeck.expr_ty(arg))
+                .is_none_or(|a| a.target == typeck.expr_ty(arg))
         })
 }
 

clippy_lints/src/excessive_bools.rs

@@ -165,7 +165,7 @@ impl<'tcx> LateLintPass<'tcx> for ExcessiveBools {
             && fn_header.abi == Abi::Rust
             && fn_decl.inputs.len() as u64 > self.max_fn_params_bools
             && get_parent_as_impl(cx.tcx, cx.tcx.local_def_id_to_hir_id(def_id))
-                .map_or(true, |impl_item| impl_item.of_trait.is_none())
+                .is_none_or(|impl_item| impl_item.of_trait.is_none())
         {
             check_fn_decl(cx, fn_decl, span, self.max_fn_params_bools);
         }

clippy_lints/src/from_over_into.rs

@@ -92,7 +92,7 @@ impl<'tcx> LateLintPass<'tcx> for FromOverInto {
                 |diag| {
                     // If the target type is likely foreign mention the orphan rules as it's a common source of
                     // confusion
-                    if path_def_id(cx, target_ty.peel_refs()).map_or(true, |id| !id.is_local()) {
+                    if path_def_id(cx, target_ty.peel_refs()).is_none_or(|id| !id.is_local()) {
                         diag.help(
                             "`impl From<Local> for Foreign` is allowed by the orphan rules, for more information see\n\
                             https://doc.rust-lang.org/reference/items/implementations.html#trait-implementation-coherence"

clippy_lints/src/if_let_mutex.rs

@@ -97,7 +97,7 @@ fn mutex_lock_call<'tcx>(
         && path.ident.as_str() == "lock"
         && let ty = cx.typeck_results().expr_ty(self_arg).peel_refs()
         && is_type_diagnostic_item(cx, ty, sym::Mutex)
-        && op_mutex.map_or(true, |op| eq_expr_value(cx, self_arg, op))
+        && op_mutex.is_none_or(|op| eq_expr_value(cx, self_arg, op))
     {
         ControlFlow::Break(self_arg)
     } else {

clippy_lints/src/loops/explicit_iter_loop.rs

@@ -29,7 +29,7 @@ pub(super) fn check(
             if !msrv.meets(msrvs::ARRAY_INTO_ITERATOR) {
                 return;
             }
-        } else if count.try_to_target_usize(cx.tcx).map_or(true, |x| x > 32) && !msrv.meets(msrvs::ARRAY_IMPL_ANY_LEN) {
+        } else if count.try_to_target_usize(cx.tcx).is_none_or(|x| x > 32) && !msrv.meets(msrvs::ARRAY_IMPL_ANY_LEN) {
             return;
         }
     }

clippy_lints/src/matches/collapsible_match.rs

@@ -72,14 +72,13 @@ fn check_arm<'tcx>(
             (Some(a), Some(b)) => SpanlessEq::new(cx).eq_expr(a, b),
         }
         // the binding must not be used in the if guard
-        && outer_guard.map_or(
-            true,
+        && outer_guard.is_none_or(
             |e| !is_local_used(cx, e, binding_id)
         )
         // ...or anywhere in the inner expression
         && match inner {
             IfLetOrMatch::IfLet(_, _, body, els, _) => {
-                !is_local_used(cx, body, binding_id) && els.map_or(true, |e| !is_local_used(cx, e, binding_id))
+                !is_local_used(cx, body, binding_id) && els.is_none_or(|e| !is_local_used(cx, e, binding_id))
             },
             IfLetOrMatch::Match(_, arms, ..) => !arms.iter().any(|arm| is_local_used(cx, arm, binding_id)),
         }

clippy_lints/src/methods/clone_on_copy.rs

@@ -30,7 +30,7 @@ pub(super) fn check(
         .type_dependent_def_id(expr.hir_id)
         .and_then(|id| cx.tcx.trait_of_item(id))
         .zip(cx.tcx.lang_items().clone_trait())
-        .map_or(true, |(x, y)| x != y)
+        .is_none_or(|(x, y)| x != y)
     {
         return;
     }

clippy_lints/src/methods/mod.rs

@@ -4107,24 +4107,32 @@ declare_clippy_lint! {
     /// ### Why is this bad?
     /// Calls such as `opt.map_or(false, |val| val == 5)` are needlessly long and cumbersome,
     /// and can be reduced to, for example, `opt == Some(5)` assuming `opt` implements `PartialEq`.
+    /// Also, calls such as `opt.map_or(true, |val| val == 5)` can be reduced to
+    /// `opt.is_none_or(|val| val == 5)`.
     /// This lint offers readability and conciseness improvements.
     ///
     /// ### Example
     /// ```no_run
-    /// pub fn a(x: Option<i32>) -> bool {
-    ///     x.map_or(false, |n| n == 5)
+    /// pub fn a(x: Option<i32>) -> (bool, bool) {
+    ///     (
+    ///         x.map_or(false, |n| n == 5),
+    ///         x.map_or(true, |n| n > 5),
+    ///     )
     /// }
     /// ```
     /// Use instead:
     /// ```no_run
-    /// pub fn a(x: Option<i32>) -> bool {
-    ///     x == Some(5)
+    /// pub fn a(x: Option<i32>) -> (bool, bool) {
+    ///     (
+    ///         x == Some(5),
+    ///         x.is_none_or(|n| n > 5),
+    ///     )
     /// }
     /// ```
     #[clippy::version = "1.75.0"]
     pub UNNECESSARY_MAP_OR,
     style,
-    "reduce unnecessary pattern matching for constructs that implement `PartialEq`"
+    "reduce unnecessary calls to `.map_or(bool, …)`"
 }
 
 declare_clippy_lint! {
@@ -4531,7 +4539,7 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
                         && method_config.output_type.matches(&sig.decl.output)
                         // in case there is no first arg, since we already have checked the number of arguments
                         // it's should be always true
-                        && first_arg_ty_opt.map_or(true, |first_arg_ty| method_config
+                        && first_arg_ty_opt.is_none_or(|first_arg_ty| method_config
                             .self_kind.matches(cx, self_ty, first_arg_ty)
                             )
                         && fn_header_equals(method_config.fn_header, sig.header)

clippy_lints/src/methods/unnecessary_filter_map.rs

@@ -23,7 +23,7 @@ pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'tcx>, a
     if let hir::ExprKind::Closure(&hir::Closure { body, .. }) = arg.kind {
         let body = cx.tcx.hir().body(body);
         let arg_id = body.params[0].pat.hir_id;
-        let mutates_arg = mutated_variables(body.value, cx).map_or(true, |used_mutably| used_mutably.contains(&arg_id));
+        let mutates_arg = mutated_variables(body.value, cx).is_none_or(|used_mutably| used_mutably.contains(&arg_id));
         let (clone_or_copy_needed, _) = clone_or_copy_needed(cx, body.params[0].pat, body.value);
 
         let (mut found_mapping, mut found_filtering) = check_expression(cx, arg_id, body.value);

clippy_lints/src/methods/unnecessary_map_or.rs

@@ -60,7 +60,7 @@ pub(super) fn check<'a>(
         Some(_) | None => return,
     };
 
-    let (sugg, method) = if let ExprKind::Closure(map_closure) = map.kind
+    let (sugg, method, applicability) = if let ExprKind::Closure(map_closure) = map.kind
             && let closure_body = cx.tcx.hir().body(map_closure.body)
             && let closure_body_value = closure_body.value.peel_blocks()
             && let ExprKind::Binary(op, l, r) = closure_body_value.kind
@@ -100,7 +100,7 @@ pub(super) fn check<'a>(
             .maybe_par()
             .into_string();
 
-        (binop, "a standard comparison")
+        (binop, "a standard comparison", Applicability::MaybeIncorrect)
     } else if !def_bool
         && msrv.meets(msrvs::OPTION_RESULT_IS_VARIANT_AND)
         && let Some(recv_callsite) = snippet_opt(cx, recv.span.source_callsite())
@@ -110,6 +110,18 @@ pub(super) fn check<'a>(
         (
             format!("{recv_callsite}.{suggested_name}({span_callsite})",),
             suggested_name,
+            Applicability::MachineApplicable,
+        )
+    } else if def_bool
+        && matches!(variant, Variant::Some)
+        && msrv.meets(msrvs::IS_NONE_OR)
+        && let Some(recv_callsite) = snippet_opt(cx, recv.span.source_callsite())
+        && let Some(span_callsite) = snippet_opt(cx, map.span.source_callsite())
+    {
+        (
+            format!("{recv_callsite}.is_none_or({span_callsite})"),
+            "is_none_or",
+            Applicability::MachineApplicable,
         )
     } else {
         return;
@@ -126,6 +138,6 @@ pub(super) fn check<'a>(
         "this `map_or` is redundant",
         format!("use {method} instead"),
         sugg,
-        Applicability::MaybeIncorrect,
+        applicability,
     );
 }

clippy_lints/src/misc.rs

@@ -351,7 +351,7 @@ fn used_underscore_binding<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
 /// `unused_variables`'s idea
 /// of what it means for an expression to be "used".
 fn is_used(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
-    get_parent_expr(cx, expr).map_or(true, |parent| match parent.kind {
+    get_parent_expr(cx, expr).is_none_or(|parent| match parent.kind {
         ExprKind::Assign(_, rhs, _) | ExprKind::AssignOp(_, _, rhs) => SpanlessEq::new(cx).eq_expr(rhs, expr),
         _ => is_used(cx, parent),
     })

clippy_lints/src/needless_borrows_for_generic_args.rs

@@ -362,7 +362,7 @@ fn referent_used_exactly_once<'tcx>(
         let body_owner_local_def_id = cx.tcx.hir().enclosing_body_owner(reference.hir_id);
         if possible_borrowers
             .last()
-            .map_or(true, |&(local_def_id, _)| local_def_id != body_owner_local_def_id)
+            .is_none_or(|&(local_def_id, _)| local_def_id != body_owner_local_def_id)
         {
             possible_borrowers.push((body_owner_local_def_id, PossibleBorrowerMap::new(cx, mir)));
         }

clippy_lints/src/no_effect.rs

@@ -238,7 +238,7 @@ fn has_no_effect(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
         ExprKind::Struct(_, fields, ref base) => {
             !has_drop(cx, cx.typeck_results().expr_ty(expr))
                 && fields.iter().all(|field| has_no_effect(cx, field.expr))
-                && base.as_ref().map_or(true, |base| has_no_effect(cx, base))
+                && base.as_ref().is_none_or(|base| has_no_effect(cx, base))
         },
         ExprKind::Call(callee, args) => {
             if let ExprKind::Path(ref qpath) = callee.kind {

clippy_lints/src/non_copy_const.rs

@@ -335,7 +335,7 @@ impl<'tcx> LateLintPass<'tcx> for NonCopyConst<'tcx> {
                 // i.e. having an enum doesn't necessary mean a type has a frozen variant.
                 // And, implementing it isn't a trivial task; it'll probably end up
                 // re-implementing the trait predicate evaluation specific to `Freeze`.
-                && body_id_opt.map_or(true, |body_id| Self::is_value_unfrozen_poly(cx, body_id, normalized))
+                && body_id_opt.is_none_or(|body_id| Self::is_value_unfrozen_poly(cx, body_id, normalized))
             {
                 lint(cx, Source::Assoc { item: trait_item.span });
             }

clippy_lints/src/only_used_in_recursion.rs

@@ -200,7 +200,7 @@ impl Params {
                 if self
                     .get_by_fn(param.fn_id, usage.idx)
                     // If the parameter can't be found, then it's used for more than just recursion.
-                    .map_or(true, |p| self.try_disable_lint_for_param(p, eval_stack))
+                    .is_none_or(|p| self.try_disable_lint_for_param(p, eval_stack))
                 {
                     param.apply_lint.set(false);
                     eval_stack.pop();

clippy_lints/src/operators/assign_op_pattern.rs

@@ -27,7 +27,7 @@ pub(super) fn check<'tcx>(
             if let Some((_, lang_item)) = binop_traits(op.node)
                 && let Some(trait_id) = cx.tcx.lang_items().get(lang_item)
                 && let parent_fn = cx.tcx.hir().get_parent_item(e.hir_id).def_id
-                && trait_ref_of_method(cx, parent_fn).map_or(true, |t| t.path.res.def_id() != trait_id)
+                && trait_ref_of_method(cx, parent_fn).is_none_or(|t| t.path.res.def_id() != trait_id)
                 && implements_trait(cx, ty, trait_id, &[rty.into()])
             {
                 // Primitive types execute assign-ops right-to-left. Every other type is left-to-right.

clippy_lints/src/ptr.rs

@@ -541,9 +541,7 @@ fn check_mut_from_ref<'tcx>(cx: &LateContext<'tcx>, sig: &FnSig<'_>, body: Optio
             .collect();
         if let Some(args) = args
             && !args.is_empty()
-            && body.map_or(true, |body| {
-                sig.header.safety == Safety::Unsafe || contains_unsafe_block(cx, body.value)
-            })
+            && body.is_none_or(|body| sig.header.safety == Safety::Unsafe || contains_unsafe_block(cx, body.value))
         {
             span_lint_and_then(
                 cx,

clippy_lints/src/redundant_async_block.rs

@@ -88,7 +88,7 @@ fn desugar_async_block<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Op
         cx.typeck_results()
             .closure_min_captures
             .get(def_id)
-            .map_or(true, |m| {
+            .is_none_or(|m| {
                 m.values().all(|places| {
                     places
                         .iter()

clippy_lints/src/single_call_fn.rs

@@ -93,7 +93,7 @@ impl SingleCallFn {
                 .tcx
                 .hir()
                 .maybe_body_owned_by(fn_def_id)
-                .map_or(true, |body| is_in_test_function(cx.tcx, body.value.hir_id))
+                .is_none_or(|body| is_in_test_function(cx.tcx, body.value.hir_id))
             || match cx.tcx.hir_node(fn_hir_id) {
                 Node::Item(item) => is_from_proc_macro(cx, item),
                 Node::ImplItem(item) => is_from_proc_macro(cx, item),

clippy_lints/src/undocumented_unsafe_blocks.rs

@@ -337,7 +337,7 @@ fn is_unsafe_from_proc_macro(cx: &LateContext<'_>, span: Span) -> bool {
         .src
         .as_deref()
         .and_then(|src| src.get(file_pos.pos.to_usize()..))
-        .map_or(true, |src| !src.starts_with("unsafe"))
+        .is_none_or(|src| !src.starts_with("unsafe"))
 }
 
 // Checks if any parent {expression, statement, block, local, const, static}

clippy_lints/src/unit_types/let_unit_value.rs

@@ -145,7 +145,7 @@ fn expr_needs_inferred_result<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>) -
     }
     while let Some(id) = locals_to_check.pop() {
         if let Node::LetStmt(l) = cx.tcx.parent_hir_node(id) {
-            if !l.ty.map_or(true, |ty| matches!(ty.kind, TyKind::Infer)) {
+            if !l.ty.is_none_or(|ty| matches!(ty.kind, TyKind::Infer)) {
                 return false;
             }
             if let Some(e) = l.init {

clippy_lints/src/upper_case_acronyms.rs

@@ -93,7 +93,7 @@ fn check_ident(cx: &LateContext<'_>, ident: &Ident, hir_id: HirId, be_aggressive
         while let Some(c) = s.next() {
             r.push(
                 if replace(&mut prev_upper, c.is_ascii_uppercase())
-                    && s.clone().next().map_or(true, |c| c.is_ascii_uppercase())
+                    && s.clone().next().is_none_or(|c| c.is_ascii_uppercase())
                 {
                     c.to_ascii_lowercase()
                 } else {

clippy_lints/src/use_self.rs

@@ -94,7 +94,7 @@ impl<'tcx> LateLintPass<'tcx> for UseSelf {
             && let parameters = &item_path.segments.last().expect(SEGMENTS_MSG).args
             && parameters
                 .as_ref()
-                .map_or(true, |params| params.parenthesized == GenericArgsParentheses::No)
+                .is_none_or(|params| params.parenthesized == GenericArgsParentheses::No)
             && !item.span.from_expansion()
             && !is_from_proc_macro(cx, item)
         // expensive, should be last check

clippy_utils/src/consts.rs

@@ -226,7 +226,7 @@ impl Constant<'_> {
                     .zip(r)
                     .zip(tys)
                     .map(|((li, ri), cmp_type)| Self::partial_cmp(tcx, cmp_type, li, ri))
-                    .find(|r| r.map_or(true, |o| o != Ordering::Equal))
+                    .find(|r| r.is_none_or(|o| o != Ordering::Equal))
                     .unwrap_or_else(|| Some(l.len().cmp(&r.len()))),
                 _ => None,
             },
@@ -236,7 +236,7 @@ impl Constant<'_> {
                 };
                 iter::zip(l, r)
                     .map(|(li, ri)| Self::partial_cmp(tcx, cmp_type, li, ri))
-                    .find(|r| r.map_or(true, |o| o != Ordering::Equal))
+                    .find(|r| r.is_none_or(|o| o != Ordering::Equal))
                     .unwrap_or_else(|| Some(l.len().cmp(&r.len())))
             },
             (Self::Repeat(lv, ls), Self::Repeat(rv, rs)) => {