Merge pull request #6209 from ethereum/dynamicCalldataStructs

Allow dynamically encoded calldata structs with ABIEncoderV2.

test/libsolidity/semanticTests/structs/calldata/dynamic_nested.sol

@@ -0,0 +1,11 @@
+pragma experimental ABIEncoderV2;
+
+contract C {
+	struct S2 { uint256 b; }
+	struct S { uint256 a; S2[] children; }
+	function f(S calldata s) external pure returns (uint256, uint256, uint256, uint256) {
+		return (s.children.length, s.a, s.children[0].b, s.children[1].b);
+	}
+}
+// ----
+// f((uint256,(uint256)[])): 32, 17, 64, 2, 23, 42 -> 2, 17, 23, 42

test/libsolidity/semanticTests/structs/calldata/dynamically_encoded.sol

@@ -0,0 +1,10 @@
+pragma experimental ABIEncoderV2;
+
+contract C {
+	struct S { uint256[] a; }
+	function f(S calldata s) external pure returns (uint256 a, uint256 b, uint256 c) {
+	    return (s.a.length, s.a[0], s.a[1]);
+	}
+}
+// ----
+// f((uint256[])): 32, 32, 2, 42, 23 -> 2, 42, 23

test/libsolidity/syntaxTests/structs/calldata_dynamic.sol

@@ -0,0 +1,7 @@
+pragma experimental ABIEncoderV2;
+contract Test {
+	struct S { int[] a; }
+	function f(S calldata) external { }
+}
+// ----
+// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.