43c97eab79
Programs such as this cause the PtrTo solver to attempt to
enumerate an infinite set of types {T, *T, ..., *******T, etc}.
t := reflect.TypeOf(T{})
for {
t = reflect.PtrTo(t)
}
The fix is to bound the depth of reflectively created types at
about 4 map/chan/slice/pointer constructors.
+ test.
LGTM=gri
R=gri
CC=crawshaw, golang-codereviews
https://golang.org/cl/102030044
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