How to define two types simultaneously?

1

Instead of one after another.

For example:
type t1 = T1(t2)
type t2 = T2(t1)

Then it shows an error.

2 
type rec t1 = T1(t2)
and t2 = T2(t1)

https://rescript-lang.org/try?version=v10.1.2&code=C4TwDgpgBAThDGVgEYoF4oBVkApgCYBKAKAEMA7AEyX3S3z2UKA

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