diff --git a/llvm/include/llvm/Support/Error.h b/llvm/include/llvm/Support/Error.h
--- a/llvm/include/llvm/Support/Error.h
+++ b/llvm/include/llvm/Support/Error.h
@@ -703,7 +703,7 @@
   }
 #endif
 
-  void assertIsChecked() {
+  void assertIsChecked() const {
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
     if (LLVM_UNLIKELY(Unchecked))
       fatalUncheckedExpected();
diff --git a/llvm/unittests/Support/ErrorTest.cpp b/llvm/unittests/Support/ErrorTest.cpp
--- a/llvm/unittests/Support/ErrorTest.cpp
+++ b/llvm/unittests/Support/ErrorTest.cpp
@@ -556,7 +556,7 @@
 TEST(Error, UncheckedExpectedInSuccessModeDestruction) {
   EXPECT_DEATH({ Expected<int> A = 7; },
                "Expected<T> must be checked before access or destruction.")
-    << "Unchecekd Expected<T> success value did not cause an abort().";
+      << "Unchecked Expected<T> success value did not cause an abort().";
 }
 #endif
 
@@ -565,9 +565,13 @@
 // Test runs in debug mode only.
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
 TEST(Error, UncheckedExpectedInSuccessModeAccess) {
-  EXPECT_DEATH({ Expected<int> A = 7; *A; },
-               "Expected<T> must be checked before access or destruction.")
-    << "Unchecekd Expected<T> success value did not cause an abort().";
+  EXPECT_DEATH(
+      {
+        const Expected<int> A = 7;
+        *A;
+      },
+      "Expected<T> must be checked before access or destruction.")
+      << "Unchecked Expected<T> success value did not cause an abort().";
 }
 #endif
 
@@ -576,9 +580,13 @@
 // Test runs in debug mode only.
 #if LLVM_ENABLE_ABI_BREAKING_CHECKS
 TEST(Error, UncheckedExpectedInSuccessModeAssignment) {
-  EXPECT_DEATH({ Expected<int> A = 7; A = 7; },
-               "Expected<T> must be checked before access or destruction.")
-    << "Unchecekd Expected<T> success value did not cause an abort().";
+  EXPECT_DEATH(
+      {
+        Expected<int> A = 7;
+        A = 7;
+      },
+      "Expected<T> must be checked before access or destruction.")
+      << "Unchecked Expected<T> success value did not cause an abort().";
 }
 #endif