I don't understand what "practicing the syntax" means (language barrier?), but I'm not suggesting that I've stopped learning, which I never will.
Rich Hickey, recently in an interview, said he doesn't do programming exercises - he is not interested in programs which don't make the computer do something useful, interesting, or both.
I, for one, type the trivial examples. Or else, I simply forget how to use them. For example, you have list comprehensions in Python, Racket, F# and if you ask me to do a list comprehension right now without looking up the reference, the only one I will get right is Python. I recently started learning F# and didn't type much code; so the concept is known, but since I didn't practice the syntax, I will have to learn it again.
That's what he means by practicing syntax.
I wouldn't however say that the complexities of C is it's syntax (unless you're playing around with macros : ) ). But I guess the concept can be applied broadly, like remembering functions, headers and other language specifics.