diff --git a/test_suite/tests/ui/conflict/alias-enum.rs b/test_suite/tests/ui/conflict/alias-enum.rs
index faceae3e7..e5e614e29 100644
--- a/test_suite/tests/ui/conflict/alias-enum.rs
+++ b/test_suite/tests/ui/conflict/alias-enum.rs
@@ -5,13 +5,10 @@ use serde_derive::Deserialize;
 #[derive(Deserialize)]
 enum E {
     S1 {
-        /// Expected error on "alias b", because this is a name of other field
-        /// Error on "alias a" is not expected because this is a name of this field
-        /// Error on "alias c" is not expected because field `c` is skipped
         #[serde(alias = "a", alias = "b", alias = "c")]
         a: (),
 
-        /// Expected error on "alias c", because it is already used as alias of `a`
+        // Warning on "c" and "b"
         #[serde(alias = "c")]
         b: (),
 
@@ -20,34 +17,31 @@ enum E {
     },
 
     S2 {
-        /// Expected error on "alias c", because this is a name of other field after
-        /// applying rename rules
         #[serde(alias = "b", alias = "c")]
         a: (),
 
+        // Warning on "c"
         #[serde(rename = "c")]
         b: (),
     },
 
     #[serde(rename_all = "UPPERCASE")]
     S3 {
-        /// Expected error on "alias B", because this is a name of field after
-        /// applying rename rules
         #[serde(alias = "B", alias = "c")]
         a: (),
+
+        // Warning on "b" because this collides with the "B" above after
+        // applying rename rules
         b: (),
     },
 }
 
 #[derive(Deserialize)]
 enum E1 {
-    /// Expected error on "alias b", because this is a name of other variant
-    /// Error on "alias a" is not expected because this is a name of this variant
-    /// Error on "alias c" is not expected because variant `c` is skipped
     #[serde(alias = "a", alias = "b", alias = "c")]
     a,
 
-    /// Expected error on "alias c", because it is already used as alias of `a`
+    // Warning on "c" and "b"
     #[serde(alias = "c")]
     b,
 
@@ -57,11 +51,10 @@ enum E1 {
 
 #[derive(Deserialize)]
 enum E2 {
-    /// Expected error on "alias c", because this is a name of other variant after
-    /// applying rename rules
     #[serde(alias = "b", alias = "c")]
     a,
 
+    // Warning on "c"
     #[serde(rename = "c")]
     b,
 }
@@ -69,10 +62,11 @@ enum E2 {
 #[derive(Deserialize)]
 #[serde(rename_all = "UPPERCASE")]
 enum E3 {
-    /// Expected error on "alias B", because this is a name of variant after
-    /// applying rename rules
     #[serde(alias = "B", alias = "c")]
     a,
+
+    // Warning on "b" because this collides with the "B" above after applying
+    // rename rules
     b,
 }
 
diff --git a/test_suite/tests/ui/conflict/alias-enum.stderr b/test_suite/tests/ui/conflict/alias-enum.stderr
index aa0ca687c..ea2ed1009 100644
--- a/test_suite/tests/ui/conflict/alias-enum.stderr
+++ b/test_suite/tests/ui/conflict/alias-enum.stderr
@@ -1,79 +1,79 @@
 error: expected expression, found `@`
-  --> tests/ui/conflict/alias-enum.rs:80:5
+  --> tests/ui/conflict/alias-enum.rs:74:5
    |
-80 |     @//fail
+74 |     @//fail
    |     ^ expected expression
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias-enum.rs:16:9
+  --> tests/ui/conflict/alias-enum.rs:13:9
    |
-11 |         #[serde(alias = "a", alias = "b", alias = "c")]
+8  |         #[serde(alias = "a", alias = "b", alias = "c")]
    |                                      --- matches all the relevant values
 ...
-16 |         b: (),
+13 |         b: (),
    |         ^ no value can reach this
    |
    = note: `#[warn(unreachable_patterns)]` on by default
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias-enum.rs:15:25
+  --> tests/ui/conflict/alias-enum.rs:12:25
    |
-11 |         #[serde(alias = "a", alias = "b", alias = "c")]
+8  |         #[serde(alias = "a", alias = "b", alias = "c")]
    |                                                   --- matches all the relevant values
 ...
-15 |         #[serde(alias = "c")]
+12 |         #[serde(alias = "c")]
    |                         ^^^ no value can reach this
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias-enum.rs:28:26
+  --> tests/ui/conflict/alias-enum.rs:24:26
    |
-25 |         #[serde(alias = "b", alias = "c")]
+20 |         #[serde(alias = "b", alias = "c")]
    |                                      --- matches all the relevant values
 ...
-28 |         #[serde(rename = "c")]
+24 |         #[serde(rename = "c")]
    |                          ^^^ no value can reach this
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias-enum.rs:38:9
+  --> tests/ui/conflict/alias-enum.rs:35:9
    |
-36 |         #[serde(alias = "B", alias = "c")]
+30 |         #[serde(alias = "B", alias = "c")]
    |                         --- matches all the relevant values
-37 |         a: (),
-38 |         b: (),
+...
+35 |         b: (),
    |         ^ no value can reach this
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias-enum.rs:52:5
+  --> tests/ui/conflict/alias-enum.rs:46:5
    |
-47 |     #[serde(alias = "a", alias = "b", alias = "c")]
+41 |     #[serde(alias = "a", alias = "b", alias = "c")]
    |                                  --- matches all the relevant values
 ...
-52 |     b,
+46 |     b,
    |     ^ no value can reach this
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias-enum.rs:51:21
+  --> tests/ui/conflict/alias-enum.rs:45:21
    |
-47 |     #[serde(alias = "a", alias = "b", alias = "c")]
+41 |     #[serde(alias = "a", alias = "b", alias = "c")]
    |                                               --- matches all the relevant values
 ...
-51 |     #[serde(alias = "c")]
+45 |     #[serde(alias = "c")]
    |                     ^^^ no value can reach this
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias-enum.rs:65:22
+  --> tests/ui/conflict/alias-enum.rs:58:22
    |
-62 |     #[serde(alias = "b", alias = "c")]
+54 |     #[serde(alias = "b", alias = "c")]
    |                                  --- matches all the relevant values
 ...
-65 |     #[serde(rename = "c")]
+58 |     #[serde(rename = "c")]
    |                      ^^^ no value can reach this
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias-enum.rs:76:5
+  --> tests/ui/conflict/alias-enum.rs:70:5
    |
-74 |     #[serde(alias = "B", alias = "c")]
+65 |     #[serde(alias = "B", alias = "c")]
    |                     --- matches all the relevant values
-75 |     a,
-76 |     b,
+...
+70 |     b,
    |     ^ no value can reach this
diff --git a/test_suite/tests/ui/conflict/alias.rs b/test_suite/tests/ui/conflict/alias.rs
index 3f6cee295..8158301c2 100644
--- a/test_suite/tests/ui/conflict/alias.rs
+++ b/test_suite/tests/ui/conflict/alias.rs
@@ -2,13 +2,10 @@ use serde_derive::Deserialize;
 
 #[derive(Deserialize)]
 struct S1 {
-    /// Expected error on "alias b", because this is a name of other field
-    /// Error on "alias a" is not expected because this is a name of this field
-    /// Error on "alias c" is not expected because field `c` is skipped
     #[serde(alias = "a", alias = "b", alias = "c")]
     a: (),
 
-    /// Expected error on "alias c", because it is already used as alias of `a`
+    // Warning on "c" and "b"
     #[serde(alias = "c")]
     b: (),
 
@@ -18,11 +15,10 @@ struct S1 {
 
 #[derive(Deserialize)]
 struct S2 {
-    /// Expected error on "alias c", because this is a name of other field after
-    /// applying rename rules
     #[serde(alias = "b", alias = "c")]
     a: (),
 
+    // Warning on "c"
     #[serde(rename = "c")]
     b: (),
 }
@@ -30,10 +26,11 @@ struct S2 {
 #[derive(Deserialize)]
 #[serde(rename_all = "UPPERCASE")]
 struct S3 {
-    /// Expected error on "alias B", because this is a name of field after
-    /// applying rename rules
     #[serde(alias = "B", alias = "c")]
     a: (),
+
+    // Warning on "b" because this collides with the "B" above after applying
+    // rename rules
     b: (),
 }
 
diff --git a/test_suite/tests/ui/conflict/alias.stderr b/test_suite/tests/ui/conflict/alias.stderr
index 7e665a630..2040cec32 100644
--- a/test_suite/tests/ui/conflict/alias.stderr
+++ b/test_suite/tests/ui/conflict/alias.stderr
@@ -1,43 +1,43 @@
 error: expected expression, found `@`
-  --> tests/ui/conflict/alias.rs:41:5
+  --> tests/ui/conflict/alias.rs:38:5
    |
-41 |     @//fail
+38 |     @//fail
    |     ^ expected expression
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias.rs:13:5
+  --> tests/ui/conflict/alias.rs:10:5
    |
-8  |     #[serde(alias = "a", alias = "b", alias = "c")]
+5  |     #[serde(alias = "a", alias = "b", alias = "c")]
    |                                  --- matches all the relevant values
 ...
-13 |     b: (),
+10 |     b: (),
    |     ^ no value can reach this
    |
    = note: `#[warn(unreachable_patterns)]` on by default
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias.rs:12:21
-   |
-8  |     #[serde(alias = "a", alias = "b", alias = "c")]
-   |                                               --- matches all the relevant values
+ --> tests/ui/conflict/alias.rs:9:21
+  |
+5 |     #[serde(alias = "a", alias = "b", alias = "c")]
+  |                                               --- matches all the relevant values
 ...
-12 |     #[serde(alias = "c")]
-   |                     ^^^ no value can reach this
+9 |     #[serde(alias = "c")]
+  |                     ^^^ no value can reach this
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias.rs:26:22
+  --> tests/ui/conflict/alias.rs:22:22
    |
-23 |     #[serde(alias = "b", alias = "c")]
+18 |     #[serde(alias = "b", alias = "c")]
    |                                  --- matches all the relevant values
 ...
-26 |     #[serde(rename = "c")]
+22 |     #[serde(rename = "c")]
    |                      ^^^ no value can reach this
 
 warning: unreachable pattern
-  --> tests/ui/conflict/alias.rs:37:5
+  --> tests/ui/conflict/alias.rs:34:5
    |
-35 |     #[serde(alias = "B", alias = "c")]
+29 |     #[serde(alias = "B", alias = "c")]
    |                     --- matches all the relevant values
-36 |     a: (),
-37 |     b: (),
+...
+34 |     b: (),
    |     ^ no value can reach this