fix: unwrap_used and expect_used FN when using fully qualified syntax

Author: profetia

clippy_lints/src/methods/mod.rs

@@ -4965,6 +4965,16 @@ impl<'tcx> LateLintPass<'tcx> for Methods {
                 io_other_error::check(cx, expr, func, args, self.msrv);
                 swap_with_temporary::check(cx, expr, func, args);
                 ip_constant::check(cx, expr, func, args);
+                unwrap_expect_used::check_call(
+                    cx,
+                    expr,
+                    func,
+                    args,
+                    self.allow_unwrap_in_tests,
+                    self.allow_expect_in_tests,
+                    self.allow_unwrap_in_consts,
+                    self.allow_expect_in_consts,
+                );
             },
             ExprKind::MethodCall(..) => {
                 self.check_methods(cx, expr);

clippy_lints/src/methods/unwrap_expect_used.rs

@@ -3,6 +3,7 @@ use clippy_utils::res::MaybeDef;
 use clippy_utils::ty::is_never_like;
 use clippy_utils::{is_in_test, is_inside_always_const_context, is_lint_allowed};
 use rustc_hir::Expr;
+use rustc_hir::def::DefKind;
 use rustc_lint::{LateContext, Lint};
 use rustc_middle::ty;
 use rustc_span::sym;
@@ -87,3 +88,70 @@ pub(super) fn check(
         },
     );
 }
+
+#[expect(clippy::too_many_arguments, clippy::fn_params_excessive_bools)]
+pub(super) fn check_call(
+    cx: &LateContext<'_>,
+    expr: &Expr<'_>,
+    func: &Expr<'_>,
+    args: &[Expr<'_>],
+    allow_unwrap_in_consts: bool,
+    allow_unwrap_in_tests: bool,
+    allow_expect_in_consts: bool,
+    allow_expect_in_tests: bool,
+) {
+    let Some(recv) = args.first() else {
+        return;
+    };
+    let Some((DefKind::AssocFn, def_id)) = cx.typeck_results().type_dependent_def(func.hir_id) else {
+        return;
+    };
+
+    match cx.tcx.item_name(def_id) {
+        sym::unwrap => {
+            check(
+                cx,
+                expr,
+                recv,
+                false,
+                allow_unwrap_in_consts,
+                allow_unwrap_in_tests,
+                Variant::Unwrap,
+            );
+        },
+        sym::expect => {
+            check(
+                cx,
+                expr,
+                recv,
+                false,
+                allow_expect_in_consts,
+                allow_expect_in_tests,
+                Variant::Expect,
+            );
+        },
+        clippy_utils::sym::unwrap_err => {
+            check(
+                cx,
+                expr,
+                recv,
+                true,
+                allow_unwrap_in_consts,
+                allow_unwrap_in_tests,
+                Variant::Unwrap,
+            );
+        },
+        clippy_utils::sym::expect_err => {
+            check(
+                cx,
+                expr,
+                recv,
+                true,
+                allow_expect_in_consts,
+                allow_expect_in_tests,
+                Variant::Expect,
+            );
+        },
+        _ => (),
+    }
+}

tests/ui/unwrap_expect_used.rs

@@ -83,3 +83,15 @@ mod with_expansion {
         let _ = open!(file).expect_err("can open"); //~ expect_used
     }
 }
+
+fn issue16484() {
+    let opt = Some(());
+    Option::unwrap(opt); //~ unwrap_used
+    Option::expect(opt, "error message"); //~ expect_used
+
+    let res: Result<(), i32> = Ok(());
+    Result::unwrap(res); //~ unwrap_used
+    Result::expect(res, "error message"); //~ expect_used
+    Result::unwrap_err(res); //~ unwrap_used
+    Result::expect_err(res, "error message"); //~ expect_used
+}

tests/ui/unwrap_expect_used.stderr

@@ -82,5 +82,53 @@ LL |         let _ = open!(file).expect_err("can open");
    |
    = note: if this value is an `Ok`, it will panic
 
-error: aborting due to 10 previous errors
+error: used `unwrap()` on an `Option` value
+  --> tests/ui/unwrap_expect_used.rs:89:5
+   |
+LL |     Option::unwrap(opt);
+   |     ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: if this value is `None`, it will panic
+
+error: used `expect()` on an `Option` value
+  --> tests/ui/unwrap_expect_used.rs:90:5
+   |
+LL |     Option::expect(opt, "error message");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: if this value is `None`, it will panic
+
+error: used `unwrap()` on a `Result` value
+  --> tests/ui/unwrap_expect_used.rs:93:5
+   |
+LL |     Result::unwrap(res);
+   |     ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: if this value is an `Err`, it will panic
+
+error: used `expect()` on a `Result` value
+  --> tests/ui/unwrap_expect_used.rs:94:5
+   |
+LL |     Result::expect(res, "error message");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: if this value is an `Err`, it will panic
+
+error: used `unwrap_err()` on a `Result` value
+  --> tests/ui/unwrap_expect_used.rs:95:5
+   |
+LL |     Result::unwrap_err(res);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: if this value is an `Ok`, it will panic
+
+error: used `expect_err()` on a `Result` value
+  --> tests/ui/unwrap_expect_used.rs:96:5
+   |
+LL |     Result::expect_err(res, "error message");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: if this value is an `Ok`, it will panic
+
+error: aborting due to 16 previous errors