hmm,
I am not able to reproduce your experience with 1.6.6(arduino-nightly.2015_11_02) or with 1.6.7(arduino-nightly.2016_02_02). I cut and pasted your line from above and it compiled successfully.
If you are Linux you may be running a newer version of avr-gcc. In windows the IDE supplies the avr-gcc and for both of the above it is avr-g++ (GCC) 4.8.1, but with linux you may have a more recent version of avr-gcc.