test/Preprocessor/macro_disable3.c

// RUN: clang %s -E | grep -F 'f(2 * (f(2 * (z[0]))));'
// Check for C99 6.10.3.4p2.

#define f(a) f(x * (a)) 
#define x 2 
#define z z[0] 
f(f(z));