llvm/clang/test/Preprocessor/macro_rescan.c

// RUN: %clang_cc1 -E %s | FileCheck --strict-whitespace %s

#define M1(a) (a+1)
#define M2(b) b

int ei_1 = M2(M1)(17);
// CHECK: {{^}}int ei_1 = (17 +1);{{$}}

int ei_2 = (M2(M1))(17);
// CHECK: {{^}}int ei_2 = (M1)(17);{{$}}