Control flow for try statements.

test/libsolidity/syntaxTests/controlFlow/storageReturn/try_err.sol

@@ -0,0 +1,34 @@
+contract C {
+    struct S { bool f; }
+    S s;
+    function ext() external {}
+    function f() internal returns (S storage r)
+    {
+        try this.ext() { }
+        catch (bytes memory) { r = s; }
+    }
+    function g() internal returns (S storage r)
+    {
+        try this.ext() { r = s; }
+        catch (bytes memory) { }
+    }
+    function h() internal returns (S storage r)
+    {
+        try this.ext() {}
+        catch Error (string memory) { r = s; }
+        catch (bytes memory) { r = s; }
+    }
+    function i() internal returns (S storage r)
+    {
+        try this.ext() { r = s; }
+        catch (bytes memory) { return r; }
+        r = s;
+    }
+}
+// ====
+// EVMVersion: >=byzantium
+// ----
+// TypeError: (113-124): This variable is of storage pointer type and can be returned without prior assignment.
+// TypeError: (240-251): This variable is of storage pointer type and can be returned without prior assignment.
+// TypeError: (367-378): This variable is of storage pointer type and can be returned without prior assignment.
+// TypeError: (631-632): This variable is of storage pointer type and can be accessed without prior assignment.

test/libsolidity/syntaxTests/controlFlow/storageReturn/try_fine.sol

@@ -0,0 +1,24 @@
+contract C {
+    struct S { bool f; }
+    S s;
+    function ext() external { }
+    function f() internal returns (S storage r)
+    {
+        try this.ext() { r = s; }
+        catch (bytes memory) { r = s; }
+    }
+    function g() internal returns (S storage r)
+    {
+        try this.ext() { r = s; }
+        catch Error (string memory) { r = s; }
+        catch (bytes memory) { r = s; }
+    }
+    function h() internal returns (S storage r)
+    {
+        try this.ext() { }
+        catch (bytes memory) { }
+        r = s;
+    }
+}
+// ====
+// EVMVersion: >=byzantium