https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106207

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Reduced:

#define FOO(no)  \
void f_##no() \
{ \
  int gen_##no(); \
}

#define GEN_FOO \
FOO(f##1) \
FOO(f##2)

GEN_FOO

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