Disallow immutable initialization in try catch statements

Trigger github

test/libsolidity/syntaxTests/immutable/try_catch_initialized.sol

@@ -0,0 +1,42 @@
+contract A
+{
+    uint256 public immutable variable;
+
+    constructor()
+    {
+        B b;
+        try b.foo(variable = 1)
+        {
+            variable = 2;
+        }
+        catch Panic(uint)
+        {
+            variable = 3;
+        }
+        catch Error(string memory)
+        {
+            variable = 4;
+        }
+        catch
+        {
+            variable = 5;
+        }
+    }
+}
+
+contract B
+{
+    function foo(uint256) external pure
+    {
+        revert();
+    }
+}
+
+// ====
+// EVMVersion: >=byzantium
+// ----
+// TypeError 4130: (108-116): Cannot write to immutable here: Immutable variables cannot be initialized inside a try/catch statement.
+// TypeError 4130: (144-152): Cannot write to immutable here: Immutable variables cannot be initialized inside a try/catch statement.
+// TypeError 4130: (216-224): Cannot write to immutable here: Immutable variables cannot be initialized inside a try/catch statement.
+// TypeError 4130: (297-305): Cannot write to immutable here: Immutable variables cannot be initialized inside a try/catch statement.
+// TypeError 4130: (357-365): Cannot write to immutable here: Immutable variables cannot be initialized inside a try/catch statement.