Member "toSlice" not found or not visible after argument-dependent lookup

[bortzmeyer]

I cannot use the library. Even with your own example:

    var len = "Unicode snowman ☃".toSlice().len();                                                                         

The compiler complains:

 % solc --abi registry.sol
registry.sol:26:15: Error: Member "toSlice" not found or not visible after argument-dependent lookup in literal_string "Unicode snowman ☃"
   uint len = "Unicode snowman ☃".toSlice().len(); 
              ^---------------------------^

% solc --v
solc, the solidity compiler commandline interface
Version: 0.3.2-0/Release-Linux/g++/Interpreter