wipAdd VM Version Paris and new built in function `prevrandaoAdd VM Version Paris and new built in function prevrandao`

test/libsolidity/syntaxTests/inlineAssembly/difficulty_nowarn_pre_paris.sol

@@ -0,0 +1,6 @@
+function f() view returns (uint) {
+    return block.difficulty;
+}
+// ====
+// EVMVersion: <paris
+// ----

test/libsolidity/syntaxTests/inlineAssembly/difficulty_reserved.sol

@@ -0,0 +1,18 @@
+contract C {
+    function f() public view returns (uint ret) {
+        assembly {
+            let difficulty := sload(0)
+            ret := difficulty
+        }
+    }
+    function g() public pure returns (uint ret) {
+        assembly {
+            function difficulty() -> r {
+                r := 1000
+            }
+            ret := difficulty()
+        }
+    }
+}
+// ----
+// ParserError 5568: (98-108): Cannot use builtin function name "difficulty" as identifier name.

test/libsolidity/syntaxTests/inlineAssembly/difficulty_warn_paris.sol

@@ -0,0 +1,7 @@
+function f() view returns (uint) {
+    return block.difficulty;
+}
+// ====
+// EVMVersion: >=paris
+// ----
+// Warning 8417: (43-59): "difficulty" was renamed and supplanted by "prevrandao" in the VM version paris.

test/libsolidity/syntaxTests/inlineAssembly/prevrandao_nowarn_paris.sol

@@ -0,0 +1,6 @@
+function f() view returns (uint) {
+    return block.prevrandao;
+}
+// ====
+// EVMVersion: >=paris
+// ----

test/libsolidity/syntaxTests/inlineAssembly/prevrandao_reserved_paris.sol

@@ -0,0 +1,20 @@
+contract C {
+    function f() public view returns (uint ret) {
+        assembly {
+            let prevrandao := sload(0)
+            ret := prevrandao
+        }
+    }
+    function g() public pure returns (uint ret) {
+        assembly {
+            function prevrandao() -> r {
+                r := 1000
+            }
+            ret := prevrandao()
+        }
+    }
+}
+// ====
+// EVMVersion: >=paris
+// ----
+// ParserError 5568: (98-108): Cannot use builtin function name "prevrandao" as identifier name.

test/libsolidity/syntaxTests/inlineAssembly/prevrandao_warn_pre_paris.sol

@@ -0,0 +1,7 @@
+function f() view returns (uint) {
+    return block.prevrandao;
+}
+// ====
+// EVMVersion: <paris
+// ----
+// Warning 9432: (43-59): "prevrandao" is not supported by the VM version and will be treated like "difficulty".