Goal:
    x : t  y : t
  ============================
   (true = eqb x y -> x = y)


DEBUG:Going to execute:
let ty := type of B in
           intro || (let H := fresh in
                     intro
                     H)
Level 2: Backtrace:

Could not infer a simplification step.
Level 2: Backtrace:

Could not infer a simplification step.
Level 2: Backtrace:

Could not infer a simplification step.
Level 2: Backtrace:

Could not infer a simplification step.