5 files changed, 48 insertions, 4 deletions
diff --git a/tests/ui/err_expect.fixed b/tests/ui/err_expect.fixed
new file mode 100644
index 00000000000..7e18d70bae4
--- /dev/null
+++ b/tests/ui/err_expect.fixed
@@ -0,0 +1,14 @@
+// run-rustfix
+
+struct MyTypeNonDebug;
+
+#[derive(Debug)]
+struct MyTypeDebug;
+
+fn main() {
+    let test_debug: Result<MyTypeDebug, u32> = Ok(MyTypeDebug);
+    test_debug.expect_err("Testing debug type");
+
+    let test_non_debug: Result<MyTypeNonDebug, u32> = Ok(MyTypeNonDebug);
+    test_non_debug.err().expect("Testing non debug type");
+}
diff --git a/tests/ui/err_expect.rs b/tests/ui/err_expect.rs
new file mode 100644
index 00000000000..bf8c3c9fb8c
--- /dev/null
+++ b/tests/ui/err_expect.rs
@@ -0,0 +1,14 @@
+// run-rustfix
+
+struct MyTypeNonDebug;
+
+#[derive(Debug)]
+struct MyTypeDebug;
+
+fn main() {
+    let test_debug: Result<MyTypeDebug, u32> = Ok(MyTypeDebug);
+    test_debug.err().expect("Testing debug type");
+
+    let test_non_debug: Result<MyTypeNonDebug, u32> = Ok(MyTypeNonDebug);
+    test_non_debug.err().expect("Testing non debug type");
+}
diff --git a/tests/ui/err_expect.stderr b/tests/ui/err_expect.stderr
new file mode 100644
index 00000000000..ffd97e00a5c
--- /dev/null
+++ b/tests/ui/err_expect.stderr
@@ -0,0 +1,10 @@
+error: called `.err().expect()` on a `Result` value
+  --> $DIR/err_expect.rs:10:16
+   |
+LL |     test_debug.err().expect("Testing debug type");
+   |                ^^^^^^^^^^^^ help: try: `expect_err`
+   |
+   = note: `-D clippy::err-expect` implied by `-D warnings`
+
+error: aborting due to previous error
+
diff --git a/tests/ui/min_rust_version_attr.rs b/tests/ui/min_rust_version_attr.rs
index 72e9bf9eb36..7666d01ffe1 100644
--- a/tests/ui/min_rust_version_attr.rs
+++ b/tests/ui/min_rust_version_attr.rs
@@ -145,6 +145,11 @@ fn int_from_bool() -> u8 {
     true as u8
 }
 
+fn err_expect() {
+    let x: Result<u32, &str> = Ok(10);
+    x.err().expect("Testing expect_err");
+}
+
 fn main() {
     filter_map_next();
     checked_conversion();
@@ -162,6 +167,7 @@ fn main() {
     missing_const_for_fn();
     unnest_or_patterns();
     int_from_bool();
+    err_expect();
 }
 
 mod just_under_msrv {
diff --git a/tests/ui/min_rust_version_attr.stderr b/tests/ui/min_rust_version_attr.stderr
index 6b3fdb0844b..9ed6308f115 100644
--- a/tests/ui/min_rust_version_attr.stderr
+++ b/tests/ui/min_rust_version_attr.stderr
@@ -1,12 +1,12 @@
 error: stripping a prefix manually
-  --> $DIR/min_rust_version_attr.rs:186:24
+  --> $DIR/min_rust_version_attr.rs:192:24
    |
 LL |             assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!");
    |                        ^^^^^^^^^^^^^^^^^^^^
    |
    = note: `-D clippy::manual-strip` implied by `-D warnings`
 note: the prefix was tested here
-  --> $DIR/min_rust_version_attr.rs:185:9
+  --> $DIR/min_rust_version_attr.rs:191:9
    |
 LL |         if s.starts_with("hello, ") {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -17,13 +17,13 @@ LL ~             assert_eq!(<stripped>.to_uppercase(), "WORLD!");
    |
 
 error: stripping a prefix manually
-  --> $DIR/min_rust_version_attr.rs:198:24
+  --> $DIR/min_rust_version_attr.rs:204:24
    |
 LL |             assert_eq!(s["hello, ".len()..].to_uppercase(), "WORLD!");
    |                        ^^^^^^^^^^^^^^^^^^^^
    |
 note: the prefix was tested here
-  --> $DIR/min_rust_version_attr.rs:197:9
+  --> $DIR/min_rust_version_attr.rs:203:9
    |
 LL |         if s.starts_with("hello, ") {
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^