Tests.

test/libsolidity/syntaxTests/inheritance/override/calldata_memory.sol

@@ -0,0 +1,13 @@
+contract A {
+    uint dummy;
+    function f(uint[] calldata) external pure {}
+    function g(uint[] calldata) external view { dummy; }
+    function h(uint[] calldata) external { dummy = 42; }
+    function i(uint[] calldata) external payable {}
+}
+contract B is A {
+    function f(uint[] memory) public pure {}
+    function g(uint[] memory) public view { dummy; }
+    function h(uint[] memory) public { dummy = 42; }
+    function i(uint[] memory) public payable {}
+}

test/libsolidity/syntaxTests/inheritance/override/calldata_memory_conflict.sol

@@ -0,0 +1,26 @@
+contract A {
+    uint dummy;
+    function f(uint[] calldata) external pure {}
+    function g(uint[] calldata) external view { dummy; }
+    function h(uint[] calldata) external { dummy = 42; }
+    function i(uint[] calldata) external payable {}
+}
+contract B is A {
+    function f(uint[] calldata) external pure {}
+    function g(uint[] calldata) external view { dummy; }
+    function h(uint[] calldata) external { dummy = 42; }
+    function i(uint[] calldata) external payable {}
+    function f(uint[] memory) public pure {}
+    function g(uint[] memory) public view { dummy; }
+    function h(uint[] memory) public { dummy = 42; }
+    function i(uint[] memory) public payable {}
+}
+// ----
+// DeclarationError: (268-312): Function with same name and arguments defined twice.
+// DeclarationError: (317-369): Function with same name and arguments defined twice.
+// DeclarationError: (374-426): Function with same name and arguments defined twice.
+// DeclarationError: (431-478): Function with same name and arguments defined twice.
+// TypeError: (268-312): Overriding function visibility differs.
+// TypeError: (317-369): Overriding function visibility differs.
+// TypeError: (374-426): Overriding function visibility differs.
+// TypeError: (431-478): Overriding function visibility differs.

test/libsolidity/syntaxTests/inheritance/override/calldata_memory_interface.sol

@@ -0,0 +1,13 @@
+interface I {
+    function f(uint[] calldata) external pure;
+    function g(uint[] calldata) external view;
+    function h(uint[] calldata) external;
+    function i(uint[] calldata) external payable;
+}
+contract C is I {
+    uint dummy;
+    function f(uint[] memory) public pure {}
+    function g(uint[] memory) public view { dummy; }
+    function h(uint[] memory) public { dummy = 42; }
+    function i(uint[] memory) public payable {}
+}

test/libsolidity/syntaxTests/inheritance/override/calldata_memory_interface_instantiate.sol

@@ -0,0 +1,12 @@
+interface I {
+    function f(uint[] calldata) external pure;
+}
+contract A is I {
+    function f(uint[] memory) public pure {}
+}
+contract C {
+    function f() public {
+        I i = I(new A());
+        i.f(new uint[](1));
+    }
+}

test/libsolidity/syntaxTests/inheritance/override/calldata_memory_interface_struct.sol

@@ -0,0 +1,17 @@
+pragma experimental ABIEncoderV2;
+interface I {
+    struct S { int a; }
+    function f(S calldata) external pure;
+    function g(S calldata) external view;
+    function h(S calldata) external;
+    function i(S calldata) external payable;
+}
+contract C is I {
+    uint dummy;
+    function f(S memory) public pure {}
+    function g(S memory) public view { dummy; }
+    function h(S memory) public { dummy = 42; }
+    function i(S memory) public payable {}
+}
+// ----
+// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.

test/libsolidity/syntaxTests/inheritance/override/calldata_memory_struct.sol

@@ -0,0 +1,17 @@
+pragma experimental ABIEncoderV2;
+contract A {
+    uint dummy;
+    struct S { int a; }
+    function f(S calldata) external pure {}
+    function g(S calldata) external view { dummy; }
+    function h(S calldata) external { dummy = 42; }
+    function i(S calldata) external payable {}
+}
+contract B is A {
+    function f(S memory) public pure {}
+    function g(S memory) public view { dummy; }
+    function h(S memory) public { dummy = 42; }
+    function i(S memory) public payable {}
+}
+// ----
+// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.

test/libsolidity/syntaxTests/inheritance/override/internal_external.sol

@@ -0,0 +1,7 @@
+contract A {
+    function f(uint[] calldata) external pure {}
+    function f(uint[] memory) internal pure {}
+}
+// ----
+// DeclarationError: (17-61): Function with same name and arguments defined twice.
+// TypeError: (17-61): Overriding function visibility differs.

test/libsolidity/syntaxTests/inheritance/override/internal_external_inheritance.sol

@@ -0,0 +1,9 @@
+contract A {
+    function f(uint[] calldata) external pure {}
+}
+contract B {
+    function f(uint[] memory) internal pure {}
+}
+contract C is A, B {}
+// ----
+// TypeError: (81-123): Overriding function visibility differs.