SPEC_TAC : term * term -> tactic
STRUCTURE
SYNOPSIS
Generalizes a goal.
DESCRIPTION
When applied to a pair of terms (u,x), where x is just a variable, and a goal A ?- t, the tactic SPEC_TAC generalizes the goal to A ?- !x. t[x/u], that is, all instances of u are turned into x.
        A ?- t
   =================  SPEC_TAC (u,x)
    A ?- !x. t[x/u]

FAILURE
Fails unless x is a variable with the same type as u.
USES
Removing unnecessary speciality in a goal, particularly as a prelude to an inductive proof.
SEEALSO
HOL  Kananaskis-14