Parsing of immutable state variable.

test/libsolidity/syntaxTests/immutable/as_function_param.sol

@@ -0,0 +1,5 @@
+contract C {
+    function f(uint immutable) public pure {}
+}
+// ----
+// DeclarationError: (28-42): The "immutable" keyword can only be used for state variables.

test/libsolidity/syntaxTests/immutable/assembly.sol

@@ -0,0 +1,11 @@
+contract C {
+    uint immutable x;
+    function f() public view {
+        uint t;
+        assembly {
+            t := x
+        }
+    }
+}
+// ----
+// TypeError: (118-119): Assembly access to immutable variables is not supported.

test/libsolidity/syntaxTests/immutable/double_specifier.sol

@@ -0,0 +1,7 @@
+contract C {
+    uint immutable immutable x;
+    uint immutable constant x;
+}
+// ----
+// ParserError: (32-41): Constantness already set to "immutable"
+// ParserError: (64-72): Constantness already set to "immutable"

test/libsolidity/syntaxTests/immutable/getter.sol

@@ -0,0 +1,5 @@
+contract C {
+    uint immutable public x;
+}
+// ----
+// UnimplementedFeatureError: NONE

test/libsolidity/syntaxTests/immutable/immutable_basic.sol

@@ -0,0 +1,3 @@
+contract C {
+    uint immutable x;
+}

test/libsolidity/syntaxTests/immutable/non-value_type.sol

@@ -0,0 +1,5 @@
+contract C {
+    uint[] immutable x;
+}
+// ----
+// TypeError: (17-35): Immutable variables cannot have a non-value type.

test/libsolidity/syntaxTests/viewPureChecker/immutable.sol

@@ -0,0 +1,8 @@
+contract B {
+    uint immutable x;
+    function f() public pure returns (uint) {
+        return x;
+    }
+}
+// ----
+// TypeError: (96-97): Function declared as pure, but this expression (potentially) reads from the environment or state and thus requires "view".