6459: Check for redundant `matches!` with `Ready`, `Pending`, `V4`, `V6`

7 files changed, 98 insertions, 56 deletions

diff --git a/clippy_lints/src/matches/redundant_pattern_match.rs b/clippy_lints/src/matches/redundant_pattern_match.rs
index 60331337e56..a4acdfb1db4 100644
--- a/clippy_lints/src/matches/redundant_pattern_match.rs
+++ b/clippy_lints/src/matches/redundant_pattern_match.rs
@@ -411,31 +411,25 @@ fn get_good_method<'tcx>(
     path_left: &QPath<'_>,
 ) -> Option<(&'static str, Option<&'tcx Guard<'tcx>>)> {
     if let Some(name) = get_ident(path_left) {
-        return match name.as_str() {
-            "Ok" => {
-                find_good_method_for_matches_macro(cx, arms, path_left, Item::Lang(ResultOk), "is_ok()", "is_err()")
-            },
-            "Err" => {
-                find_good_method_for_matches_macro(cx, arms, path_left, Item::Lang(ResultErr), "is_err()", "is_ok()")
-            },
-            "Some" => find_good_method_for_matches_macro(
-                cx,
-                arms,
-                path_left,
-                Item::Lang(OptionSome),
-                "is_some()",
-                "is_none()",
-            ),
-            "None" => find_good_method_for_matches_macro(
-                cx,
-                arms,
-                path_left,
-                Item::Lang(OptionNone),
-                "is_none()",
-                "is_some()",
-            ),
-            _ => None,
+        let (expected_item_left, should_be_left, should_be_right) = match name.as_str() {
+            "Ok" => (Item::Lang(ResultOk), "is_ok()", "is_err()"),
+            "Err" => (Item::Lang(ResultErr), "is_err()", "is_ok()"),
+            "Some" => (Item::Lang(OptionSome), "is_some()", "is_none()"),
+            "None" => (Item::Lang(OptionNone), "is_none()", "is_some()"),
+            "Ready" => (Item::Lang(PollReady), "is_ready()", "is_pending()"),
+            "Pending" => (Item::Lang(PollPending), "is_pending()", "is_ready()"),
+            "V4" => (Item::Diag(sym::IpAddr, sym!(V4)), "is_ipv4()", "is_ipv6()"),
+            "V6" => (Item::Diag(sym::IpAddr, sym!(V6)), "is_ipv6()", "is_ipv4()"),
+            _ => return None,
         };
+        return find_good_method_for_matches_macro(
+            cx,
+            arms,
+            path_left,
+            expected_item_left,
+            should_be_left,
+            should_be_right,
+        );
     }
     None
 }
diff --git a/tests/ui/redundant_pattern_matching_ipaddr.fixed b/tests/ui/redundant_pattern_matching_ipaddr.fixed
index 70dd9fc250f..429d33118a5 100644
--- a/tests/ui/redundant_pattern_matching_ipaddr.fixed
+++ b/tests/ui/redundant_pattern_matching_ipaddr.fixed
@@ -18,6 +18,12 @@ fn main() {
 
     if V6(Ipv6Addr::LOCALHOST).is_ipv6() {}
 
+    // Issue 6459
+    if V4(Ipv4Addr::LOCALHOST).is_ipv4() {}
+
+    // Issue 6459
+    if V6(Ipv6Addr::LOCALHOST).is_ipv6() {}
+
     while V4(Ipv4Addr::LOCALHOST).is_ipv4() {}
 
     while V6(Ipv6Addr::LOCALHOST).is_ipv6() {}
diff --git a/tests/ui/redundant_pattern_matching_ipaddr.rs b/tests/ui/redundant_pattern_matching_ipaddr.rs
index 6e2a2f7b6d2..e7136b72c20 100644
--- a/tests/ui/redundant_pattern_matching_ipaddr.rs
+++ b/tests/ui/redundant_pattern_matching_ipaddr.rs
@@ -18,6 +18,12 @@ fn main() {
 
     if let V6(_) = V6(Ipv6Addr::LOCALHOST) {}
 
+    // Issue 6459
+    if matches!(V4(Ipv4Addr::LOCALHOST), V4(_)) {}
+
+    // Issue 6459
+    if matches!(V6(Ipv6Addr::LOCALHOST), V6(_)) {}
+
     while let V4(_) = V4(Ipv4Addr::LOCALHOST) {}
 
     while let V6(_) = V6(Ipv6Addr::LOCALHOST) {}
diff --git a/tests/ui/redundant_pattern_matching_ipaddr.stderr b/tests/ui/redundant_pattern_matching_ipaddr.stderr
index d36129a2bee..54cefa5e82b 100644
--- a/tests/ui/redundant_pattern_matching_ipaddr.stderr
+++ b/tests/ui/redundant_pattern_matching_ipaddr.stderr
@@ -20,19 +20,31 @@ LL |     if let V6(_) = V6(Ipv6Addr::LOCALHOST) {}
    |     -------^^^^^-------------------------- help: try: `if V6(Ipv6Addr::LOCALHOST).is_ipv6()`
 
 error: redundant pattern matching, consider using `is_ipv4()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:21:15
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:22:8
+   |
+LL |     if matches!(V4(Ipv4Addr::LOCALHOST), V4(_)) {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `V4(Ipv4Addr::LOCALHOST).is_ipv4()`
+
+error: redundant pattern matching, consider using `is_ipv6()`
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:25:8
+   |
+LL |     if matches!(V6(Ipv6Addr::LOCALHOST), V6(_)) {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `V6(Ipv6Addr::LOCALHOST).is_ipv6()`
+
+error: redundant pattern matching, consider using `is_ipv4()`
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:27:15
    |
 LL |     while let V4(_) = V4(Ipv4Addr::LOCALHOST) {}
    |     ----------^^^^^-------------------------- help: try: `while V4(Ipv4Addr::LOCALHOST).is_ipv4()`
 
 error: redundant pattern matching, consider using `is_ipv6()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:23:15
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:29:15
    |
 LL |     while let V6(_) = V6(Ipv6Addr::LOCALHOST) {}
    |     ----------^^^^^-------------------------- help: try: `while V6(Ipv6Addr::LOCALHOST).is_ipv6()`
 
 error: redundant pattern matching, consider using `is_ipv4()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:33:5
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:39:5
    |
 LL | /     match V4(Ipv4Addr::LOCALHOST) {
 LL | |         V4(_) => true,
@@ -41,7 +53,7 @@ LL | |     };
    | |_____^ help: try: `V4(Ipv4Addr::LOCALHOST).is_ipv4()`
 
 error: redundant pattern matching, consider using `is_ipv6()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:38:5
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:44:5
    |
 LL | /     match V4(Ipv4Addr::LOCALHOST) {
 LL | |         V4(_) => false,
@@ -50,7 +62,7 @@ LL | |     };
    | |_____^ help: try: `V4(Ipv4Addr::LOCALHOST).is_ipv6()`
 
 error: redundant pattern matching, consider using `is_ipv6()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:43:5
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:49:5
    |
 LL | /     match V6(Ipv6Addr::LOCALHOST) {
 LL | |         V4(_) => false,
@@ -59,7 +71,7 @@ LL | |     };
    | |_____^ help: try: `V6(Ipv6Addr::LOCALHOST).is_ipv6()`
 
 error: redundant pattern matching, consider using `is_ipv4()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:48:5
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:54:5
    |
 LL | /     match V6(Ipv6Addr::LOCALHOST) {
 LL | |         V4(_) => true,
@@ -68,49 +80,49 @@ LL | |     };
    | |_____^ help: try: `V6(Ipv6Addr::LOCALHOST).is_ipv4()`
 
 error: redundant pattern matching, consider using `is_ipv4()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:53:20
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:59:20
    |
 LL |     let _ = if let V4(_) = V4(Ipv4Addr::LOCALHOST) {
    |             -------^^^^^-------------------------- help: try: `if V4(Ipv4Addr::LOCALHOST).is_ipv4()`
 
 error: redundant pattern matching, consider using `is_ipv4()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:61:20
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:67:20
    |
 LL |     let _ = if let V4(_) = gen_ipaddr() {
    |             -------^^^^^--------------- help: try: `if gen_ipaddr().is_ipv4()`
 
 error: redundant pattern matching, consider using `is_ipv6()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:63:19
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:69:19
    |
 LL |     } else if let V6(_) = gen_ipaddr() {
    |            -------^^^^^--------------- help: try: `if gen_ipaddr().is_ipv6()`
 
 error: redundant pattern matching, consider using `is_ipv4()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:75:12
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:81:12
    |
 LL |     if let V4(_) = V4(Ipv4Addr::LOCALHOST) {}
    |     -------^^^^^-------------------------- help: try: `if V4(Ipv4Addr::LOCALHOST).is_ipv4()`
 
 error: redundant pattern matching, consider using `is_ipv6()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:77:12
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:83:12
    |
 LL |     if let V6(_) = V6(Ipv6Addr::LOCALHOST) {}
    |     -------^^^^^-------------------------- help: try: `if V6(Ipv6Addr::LOCALHOST).is_ipv6()`
 
 error: redundant pattern matching, consider using `is_ipv4()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:79:15
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:85:15
    |
 LL |     while let V4(_) = V4(Ipv4Addr::LOCALHOST) {}
    |     ----------^^^^^-------------------------- help: try: `while V4(Ipv4Addr::LOCALHOST).is_ipv4()`
 
 error: redundant pattern matching, consider using `is_ipv6()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:81:15
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:87:15
    |
 LL |     while let V6(_) = V6(Ipv6Addr::LOCALHOST) {}
    |     ----------^^^^^-------------------------- help: try: `while V6(Ipv6Addr::LOCALHOST).is_ipv6()`
 
 error: redundant pattern matching, consider using `is_ipv4()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:83:5
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:89:5
    |
 LL | /     match V4(Ipv4Addr::LOCALHOST) {
 LL | |         V4(_) => true,
@@ -119,7 +131,7 @@ LL | |     };
    | |_____^ help: try: `V4(Ipv4Addr::LOCALHOST).is_ipv4()`
 
 error: redundant pattern matching, consider using `is_ipv6()`
-  --> $DIR/redundant_pattern_matching_ipaddr.rs:88:5
+  --> $DIR/redundant_pattern_matching_ipaddr.rs:94:5
    |
 LL | /     match V6(Ipv6Addr::LOCALHOST) {
 LL | |         V4(_) => false,
@@ -127,5 +139,5 @@ LL | |         V6(_) => true,
 LL | |     };
    | |_____^ help: try: `V6(Ipv6Addr::LOCALHOST).is_ipv6()`
 
-error: aborting due to 18 previous errors
+error: aborting due to 20 previous errors
 
diff --git a/tests/ui/redundant_pattern_matching_poll.fixed b/tests/ui/redundant_pattern_matching_poll.fixed
index 718c2f8ea3d..08d83f87e4c 100644
--- a/tests/ui/redundant_pattern_matching_poll.fixed
+++ b/tests/ui/redundant_pattern_matching_poll.fixed
@@ -22,6 +22,12 @@ fn main() {
         bar();
     }
 
+    // Issue 6459
+    if Ready(42).is_ready() {}
+
+    // Issue 6459
+    if Pending::<()>.is_pending() {}
+
     while Ready(42).is_ready() {}
 
     while Ready(42).is_pending() {}
diff --git a/tests/ui/redundant_pattern_matching_poll.rs b/tests/ui/redundant_pattern_matching_poll.rs
index daa4761aff5..7bc2b3be4d3 100644
--- a/tests/ui/redundant_pattern_matching_poll.rs
+++ b/tests/ui/redundant_pattern_matching_poll.rs
@@ -22,6 +22,12 @@ fn main() {
         bar();
     }
 
+    // Issue 6459
+    if matches!(Ready(42), Ready(_)) {}
+
+    // Issue 6459
+    if matches!(Pending::<()>, Pending) {}
+
     while let Ready(_) = Ready(42) {}
 
     while let Pending = Ready(42) {}
diff --git a/tests/ui/redundant_pattern_matching_poll.stderr b/tests/ui/redundant_pattern_matching_poll.stderr
index c010c3c4437..de64331b4e8 100644
--- a/tests/ui/redundant_pattern_matching_poll.stderr
+++ b/tests/ui/redundant_pattern_matching_poll.stderr
@@ -20,25 +20,37 @@ LL |     if let Ready(_) = Ready(42) {
    |     -------^^^^^^^^------------ help: try: `if Ready(42).is_ready()`
 
 error: redundant pattern matching, consider using `is_ready()`
-  --> $DIR/redundant_pattern_matching_poll.rs:25:15
+  --> $DIR/redundant_pattern_matching_poll.rs:26:8
+   |
+LL |     if matches!(Ready(42), Ready(_)) {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Ready(42).is_ready()`
+
+error: redundant pattern matching, consider using `is_pending()`
+  --> $DIR/redundant_pattern_matching_poll.rs:29:8
+   |
+LL |     if matches!(Pending::<()>, Pending) {}
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Pending::<()>.is_pending()`
+
+error: redundant pattern matching, consider using `is_ready()`
+  --> $DIR/redundant_pattern_matching_poll.rs:31:15
    |
 LL |     while let Ready(_) = Ready(42) {}
    |     ----------^^^^^^^^------------ help: try: `while Ready(42).is_ready()`
 
 error: redundant pattern matching, consider using `is_pending()`
-  --> $DIR/redundant_pattern_matching_poll.rs:27:15
+  --> $DIR/redundant_pattern_matching_poll.rs:33:15
    |
 LL |     while let Pending = Ready(42) {}
    |     ----------^^^^^^^------------ help: try: `while Ready(42).is_pending()`
 
 error: redundant pattern matching, consider using `is_pending()`
-  --> $DIR/redundant_pattern_matching_poll.rs:29:15
+  --> $DIR/redundant_pattern_matching_poll.rs:35:15
    |
 LL |     while let Pending = Pending::<()> {}
    |     ----------^^^^^^^---------------- help: try: `while Pending::<()>.is_pending()`
 
 error: redundant pattern matching, consider using `is_ready()`
-  --> $DIR/redundant_pattern_matching_poll.rs:35:5
+  --> $DIR/redundant_pattern_matching_poll.rs:41:5
    |
 LL | /     match Ready(42) {
 LL | |         Ready(_) => true,
@@ -47,7 +59,7 @@ LL | |     };
    | |_____^ help: try: `Ready(42).is_ready()`
 
 error: redundant pattern matching, consider using `is_pending()`
-  --> $DIR/redundant_pattern_matching_poll.rs:40:5
+  --> $DIR/redundant_pattern_matching_poll.rs:46:5
    |
 LL | /     match Pending::<()> {
 LL | |         Ready(_) => false,
@@ -56,7 +68,7 @@ LL | |     };
    | |_____^ help: try: `Pending::<()>.is_pending()`
 
 error: redundant pattern matching, consider using `is_pending()`
-  --> $DIR/redundant_pattern_matching_poll.rs:45:13
+  --> $DIR/redundant_pattern_matching_poll.rs:51:13
    |
 LL |       let _ = match Pending::<()> {
    |  _____________^
@@ -66,49 +78,49 @@ LL | |     };
    | |_____^ help: try: `Pending::<()>.is_pending()`
 
 error: redundant pattern matching, consider using `is_ready()`
-  --> $DIR/redundant_pattern_matching_poll.rs:51:20
+  --> $DIR/redundant_pattern_matching_poll.rs:57:20
    |
 LL |     let _ = if let Ready(_) = poll { true } else { false };
    |             -------^^^^^^^^------- help: try: `if poll.is_ready()`
 
 error: redundant pattern matching, consider using `is_ready()`
-  --> $DIR/redundant_pattern_matching_poll.rs:55:20
+  --> $DIR/redundant_pattern_matching_poll.rs:61:20
    |
 LL |     let _ = if let Ready(_) = gen_poll() {
    |             -------^^^^^^^^------------- help: try: `if gen_poll().is_ready()`
 
 error: redundant pattern matching, consider using `is_pending()`
-  --> $DIR/redundant_pattern_matching_poll.rs:57:19
+  --> $DIR/redundant_pattern_matching_poll.rs:63:19
    |
 LL |     } else if let Pending = gen_poll() {
    |            -------^^^^^^^------------- help: try: `if gen_poll().is_pending()`
 
 error: redundant pattern matching, consider using `is_ready()`
-  --> $DIR/redundant_pattern_matching_poll.rs:73:12
+  --> $DIR/redundant_pattern_matching_poll.rs:79:12
    |
 LL |     if let Ready(_) = Ready(42) {}
    |     -------^^^^^^^^------------ help: try: `if Ready(42).is_ready()`
 
 error: redundant pattern matching, consider using `is_pending()`
-  --> $DIR/redundant_pattern_matching_poll.rs:75:12
+  --> $DIR/redundant_pattern_matching_poll.rs:81:12
    |
 LL |     if let Pending = Pending::<()> {}
    |     -------^^^^^^^---------------- help: try: `if Pending::<()>.is_pending()`
 
 error: redundant pattern matching, consider using `is_ready()`
-  --> $DIR/redundant_pattern_matching_poll.rs:77:15
+  --> $DIR/redundant_pattern_matching_poll.rs:83:15
    |
 LL |     while let Ready(_) = Ready(42) {}
    |     ----------^^^^^^^^------------ help: try: `while Ready(42).is_ready()`
 
 error: redundant pattern matching, consider using `is_pending()`
-  --> $DIR/redundant_pattern_matching_poll.rs:79:15
+  --> $DIR/redundant_pattern_matching_poll.rs:85:15
    |
 LL |     while let Pending = Pending::<()> {}
    |     ----------^^^^^^^---------------- help: try: `while Pending::<()>.is_pending()`
 
 error: redundant pattern matching, consider using `is_ready()`
-  --> $DIR/redundant_pattern_matching_poll.rs:81:5
+  --> $DIR/redundant_pattern_matching_poll.rs:87:5
    |
 LL | /     match Ready(42) {
 LL | |         Ready(_) => true,
@@ -117,7 +129,7 @@ LL | |     };
    | |_____^ help: try: `Ready(42).is_ready()`
 
 error: redundant pattern matching, consider using `is_pending()`
-  --> $DIR/redundant_pattern_matching_poll.rs:86:5
+  --> $DIR/redundant_pattern_matching_poll.rs:92:5
    |
 LL | /     match Pending::<()> {
 LL | |         Ready(_) => false,
@@ -125,5 +137,5 @@ LL | |         Pending => true,
 LL | |     };
    | |_____^ help: try: `Pending::<()>.is_pending()`
 
-error: aborting due to 18 previous errors
+error: aborting due to 20 previous errors