pragma experimental ABIEncoderV2; contract C { function gggggggg(uint8[2] calldata s) external pure returns (bytes memory) { s[0]; // only this will validate. return msg.data; } function f(uint256 a, uint256 b) public returns (bytes memory) { uint8[2] memory m = [0,0]; assembly { mstore(m, a) mstore(add(m, 0x20), b) } return this.gggggggg(m); } } // ==== // compileViaYul: also // EVMVersion: >homestead // ---- // f(uint256,uint256): 1, 1 -> 0x20, 0x44, hex"78b86ac6", 1, 1, hex"00000000000000000000000000000000000000000000000000000000" // gggggggg(uint8[2]): 1, 1 -> 0x20, 0x44, hex"78b86ac6", 1, 1, hex"00000000000000000000000000000000000000000000000000000000" // f(uint256,uint256): 0x0101, 0x0101 -> 0x20, 0x44, hex"78b86ac6", 1, 1, hex"00000000000000000000000000000000000000000000000000000000" // gggggggg(uint8[2]): 0x0101, 0x0101 -> FAILURE