code: regress

ref: f362be8f65afb8dc5c18507d7f3750206ab4f0ec
dir: /cmd/cpp/cycle.test/

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#define A B
#define B A
A
B

#define X(x) Y(x)
#define Y(x) X(x)
X(1)
Y(1)

#define R(x) RS
#define RS R(x)
RS
R(1)