diff --git a/LanguageFeatures/Patterns/relational_A06_t01.dart b/LanguageFeatures/Patterns/relational_A06_t01.dart
index 3203743f8b..78b382e539 100644
--- a/LanguageFeatures/Patterns/relational_A06_t01.dart
+++ b/LanguageFeatures/Patterns/relational_A06_t01.dart
@@ -33,24 +33,24 @@ class C {
 
 String test1(C c) {
   return switch (c) {
-    < C(0) => "negative",
-    >= C(0) => "positive",
+    < const C(0) => "negative",
+    >= const C(0) => "positive",
     _ => "Impossible!"
   };
 }
 
 String test2(C c) {
   return switch (c) {
-    >= C(0) => "positive",
-    < C(0) => "negative",
+    >= const C(0) => "positive",
+    < const C(0) => "negative",
     _ => "Impossible!"
   };
 }
 
 String test3(C c) {
   return switch (c) {
-    == C(0) => "zero",
-    != C(0) => "non-zero",
+    == const C(0) => "zero",
+    != const C(0) => "non-zero",
     _ => "Impossible!"
   };
 }
diff --git a/LanguageFeatures/Patterns/relational_A06_t02.dart b/LanguageFeatures/Patterns/relational_A06_t02.dart
index 0e1f885dc3..0ad1a72e83 100644
--- a/LanguageFeatures/Patterns/relational_A06_t02.dart
+++ b/LanguageFeatures/Patterns/relational_A06_t02.dart
@@ -33,10 +33,10 @@ class C {
 }
 
 String test(List<C> list) => switch (list) {
-  [> C(0) && <= C(2)] => "case 1",
-  [== C(42)] => "case 2",
-  [>= C(10) && < C(20)] => "case 3",
-  [!= C(100)] => "case 4",
+  [> const C(0) && <= const C(2)] => "case 1",
+  [== const C(42)] => "case 2",
+  [>= const C(10) && < const C(20)] => "case 3",
+  [!= const C(100)] => "case 4",
   _ => "default"
 };
 
diff --git a/LanguageFeatures/Patterns/relational_A06_t03.dart b/LanguageFeatures/Patterns/relational_A06_t03.dart
index e2750a8f3a..9ed0487779 100644
--- a/LanguageFeatures/Patterns/relational_A06_t03.dart
+++ b/LanguageFeatures/Patterns/relational_A06_t03.dart
@@ -33,13 +33,13 @@ class C {
 
 void test1(C c, String expected) {
   switch (c) {
-    case < C(0):
+    case < const C(0):
       Expect.equals("negative", expected);
       break;
-    case == C(0):
+    case == const C(0):
       Expect.equals("zero", expected);
       break;
-    case > C(0):
+    case > const C(0):
       Expect.equals("positive", expected);
       break;
     default:
@@ -49,10 +49,10 @@ void test1(C c, String expected) {
 
 void test2(C c, String expected) {
   switch (c) {
-    case != C(0):
+    case != const C(0):
       Expect.equals("non-zero", expected);
       break;
-    case == C(0):
+    case == const C(0):
       Expect.equals("zero", expected);
       break;
     default:
diff --git a/LanguageFeatures/Patterns/relational_A06_t04.dart b/LanguageFeatures/Patterns/relational_A06_t04.dart
index dc4bdf03ab..e6b42391a8 100644
--- a/LanguageFeatures/Patterns/relational_A06_t04.dart
+++ b/LanguageFeatures/Patterns/relational_A06_t04.dart
@@ -34,16 +34,16 @@ class C {
 
 void test(List<C> list, String expected) {
   switch (list) {
-    case [> C(0) && <= C(2)]:
+    case [> const C(0) && <= const C(2)]:
       Expect.equals("case 1", expected);
       break;
-    case [== C(42)]:
+    case [== const C(42)]:
       Expect.equals("case 2", expected);
       break;
-    case [>= C(10) && < C(20)]:
+    case [>= const C(10) && < const C(20)]:
       Expect.equals("case 3", expected);
       break;
-    case [!= C(100)]:
+    case [!= const C(100)]:
       Expect.equals("case 4", expected);
       break;
     default:
diff --git a/LanguageFeatures/Patterns/relational_A06_t05.dart b/LanguageFeatures/Patterns/relational_A06_t05.dart
index d7968312bc..2d4e63d5ff 100644
--- a/LanguageFeatures/Patterns/relational_A06_t05.dart
+++ b/LanguageFeatures/Patterns/relational_A06_t05.dart
@@ -32,11 +32,11 @@ class C {
 }
 
 void test1(C c, String expected) {
-  if (c case < C(0)) {
+  if (c case < const C(0)) {
     Expect.equals("negative", expected);
-  } else if (c case == C(0)) {
+  } else if (c case == const C(0)) {
     Expect.equals("zero", expected);
-  } else if (c case > C(0)) {
+  } else if (c case > const C(0)) {
     Expect.equals("positive", expected);
   } else {
     Expect.fail("One of the cases above should match");
@@ -44,9 +44,9 @@ void test1(C c, String expected) {
 }
 
 void test2(C c, String expected) {
-  if (c case != C(0)) {
+  if (c case != const C(0)) {
     Expect.equals("non-zero", expected);
-  } else if (c case == C(0)) {
+  } else if (c case == const C(0)) {
     Expect.equals("zero", expected);
   } else {
     Expect.fail("One of the cases above should match");
diff --git a/LanguageFeatures/Patterns/relational_A06_t06.dart b/LanguageFeatures/Patterns/relational_A06_t06.dart
index fbac79e1f5..90add2cbfc 100644
--- a/LanguageFeatures/Patterns/relational_A06_t06.dart
+++ b/LanguageFeatures/Patterns/relational_A06_t06.dart
@@ -33,13 +33,13 @@ class C {
 }
 
 void test(List<C> list, String expected) {
-  if (list case [> C(0) && <= C(2)]) {
+  if (list case [> const C(0) && <= const C(2)]) {
     Expect.equals("case 1", expected);
-  } else if (list case [== C(42)]) {
+  } else if (list case [== const C(42)]) {
     Expect.equals("case 2", expected);
-  } else if (list case [>= C(10) && < C(20)]) {
+  } else if (list case [>= const C(10) && < const C(20)]) {
     Expect.equals("case 3", expected);
-  } else if (list case [!= C(100)]) {
+  } else if (list case [!= const C(100)]) {
     Expect.equals("case 4", expected);
   } else {
     Expect.equals("default", expected);