Goal:
    x : t  y : t  Heq_anonymous : false = eqb x y
  ============================
   (x <> y)


DEBUG:Going to execute:
Tactics.autoinjections
Level 1: Backtrace:

Ltac variable Y is bound to eqb x y of type constr which cannot be coerced to
a variable.
Level 1: Backtrace:

Ltac variable Y is bound to eqb x y of type constr which cannot be coerced to
a variable.
Level 0: Backtrace:

No matching clauses for match.