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The command has indeed failed with message:
In environment
y : nat
The term "a y" has type "{y0 : nat | y = y0}"
while it is expected to have type "{x : nat | x = y}".
1 focused subgoal
(shelved: 1)
H : ?n <= 3 -> 3 <= ?n -> ?n = 3
============================
True
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