'\''         // rune literal containing single quote character
'aa'         // illegal: too many characters
'\k'         // illegal: k is not recognized after a backslash
'\xa'        // illegal: too few hexadecimal digits
'\0'         // illegal: too few octal digits
'\400'       // illegal: octal value over 255
'\uDFFF'     // illegal: surrogate half
'\U00110000' // illegal: invalid Unicode code point
</pre>

            Errors.INVISIBLE_MEMBER,
            Errors.NO_VALUE_FOR_PARAMETER,
            Errors.MISSING_RECEIVER,
            Errors.NO_RECEIVER_ALLOWED,
            Errors.ILLEGAL_SELECTOR,
            Errors.FUNCTION_EXPECTED,
            Errors.FUNCTION_CALL_EXPECTED,
            Errors.NO_CONSTRUCTOR,
            Errors.OVERLOAD_RESOLUTION_AMBIGUITY,
            Errors.NONE_APPLICABLE,

    backward compatibility.
*   Move `layers_dense_variational_impl.py` to `layers_dense_variational.py`.

## Known Bugs

*   Using XLA:GPU with CUDA 9 and CUDA 9.1 results in garbage results and/or
    `CUDA_ILLEGAL_ADDRESS` failures.

    Google discovered in mid-December 2017 that the PTX-to-SASS compiler in CUDA
    9 and CUDA 9.1 sometimes does not properly compute the carry bit when