Goal:
    A : Type  n : nat  H : n < #|[]|
  ============================
   A


DEBUG:Going to execute:
match H with
           | H' => fail 2
           | _ => unify X Y; clear H' || clear H
           end
Level 4: Backtrace:

In environment
A : Type
n : nat
H : n < #|[]|
Unable to unify "Type" with "nat".
Level 4: Backtrace:

In environment
A : Type
n : nat
H : n < #|[]|
Unable to unify "Type" with "nat".
Level 4: Backtrace:

In environment
A : Type
n : nat
H : n < #|[]|
Unable to unify "Type" with "nat".
Level 4: Backtrace:

In environment
A : Type
n : nat
H : n < #|[]|
Unable to unify "Type" with "nat".
Level 3: Backtrace:

In environment
A : Type
n : nat
H : n < #|[]|
Unable to unify "Type" with "nat".