solidity/test/libsolidity/syntaxTests/types/encoding_packed_fractional.sol

contract C {
   function f1() public pure returns (bytes memory) {
       return abi.encodePacked(0.1, 1);
   }
}
// ----
// TypeError: (98-101): Fractional numbers cannot yet be encoded.
// TypeError: (103-104): Cannot perform packed encoding for a literal. Please convert it to an explicit type first.