Tests for checked/unchecked suffixes

test/libsolidity/semanticTests/literalSuffixes/checked_suffixes.sol

@@ -0,0 +1,18 @@
+function checkedSuffix(uint8 x) pure suffix returns (uint8) {
+    return x + 10;
+}
+
+contract C {
+    function testCheckedSuffix() public pure returns (uint8) {
+        return 250 checkedSuffix;
+    }
+
+    function testCheckedSuffixInUncheckedBlock() public pure returns (uint8) {
+        unchecked {
+            return 250 checkedSuffix;
+        }
+    }
+}
+// ----
+// testCheckedSuffix() -> FAILURE, hex"4e487b71", 0x11
+// testCheckedSuffixInUncheckedBlock() -> FAILURE, hex"4e487b71", 0x11

test/libsolidity/semanticTests/literalSuffixes/unchecked_suffixes.sol

@@ -0,0 +1,20 @@
+function uncheckedSuffix(uint8 x) pure suffix returns (uint8) {
+    unchecked {
+        return x + 10;
+    }
+}
+
+contract C {
+    function testUncheckedSuffix() public pure returns (uint8) {
+        return 250 uncheckedSuffix;
+    }
+
+    function testUncheckedSuffixInUncheckedBlock() public pure returns (uint8) {
+        unchecked {
+            return 250 uncheckedSuffix;
+        }
+    }
+}
+// ----
+// testUncheckedSuffix() -> 4
+// testUncheckedSuffixInUncheckedBlock() -> 4

test/libsolidity/semanticTests/operators/userDefined/unchecked_operators.sol

@@ -8,7 +8,7 @@ function uncheckedAdd(U8 x, U8 y) pure returns (U8) {
 
 using {uncheckedAdd as +} for U8 global;
 
-contract D {
+contract C {
     function testUncheckedOperator() public pure returns (U8) {
         return U8.wrap(250) + U8.wrap(10);
     }
@@ -19,7 +19,6 @@ contract D {
         }
     }
 }
-
 // ----
 // testUncheckedOperator() -> 4
 // testUncheckedOperatorInUncheckedBlock() -> 4