pragma experimental ABIEncoderV2; contract C { function ggg(uint8[] calldata s) external pure returns (bytes memory) { s[0]; // only this will validate. return msg.data; } function f(uint256[] calldata a) external returns (bytes memory) { uint8[] memory m = new uint8[](a.length); assembly { calldatacopy(add(m, 0x20), 0x44, mul(calldataload(4), 0x20)) } return this.ggg(m); } } // ==== // compileViaYul: also // EVMVersion: >homestead // ---- // f(uint256[]): 0x20, 2, 1, 1 -> 0x20, 0x84, hex"304a4c23", 0x20, 2, 1, 1, hex"00000000000000000000000000000000000000000000000000000000" // ggg(uint8[]): 0x20, 2, 1, 1 -> 0x20, 0x84, hex"304a4c23", 0x20, 2, 1, 1, hex"00000000000000000000000000000000000000000000000000000000" // f(uint256[]): 0x20, 2, 0x0101, 0x0101 -> 0x20, 0x84, hex"304a4c23", 0x20, 2, 1, 1, hex"00000000000000000000000000000000000000000000000000000000" // ggg(uint8[]): 0x20, 2, 0x0101, 0x0101 -> FAILURE