-val simpl_tac: pattern:ProofEngineTypes.pattern -> ProofEngineTypes.tactic
-val reduce_tac: pattern:ProofEngineTypes.pattern -> ProofEngineTypes.tactic
-val whd_tac: pattern:ProofEngineTypes.pattern -> ProofEngineTypes.tactic
-val normalize_tac: pattern:ProofEngineTypes.pattern -> ProofEngineTypes.tactic
+val unfold_tac:
+ ProofEngineTypes.lazy_term option ->
+ pattern:ProofEngineTypes.lazy_pattern ->
+ ProofEngineTypes.tactic
+
+val change_tac:
+ pattern:ProofEngineTypes.lazy_pattern ->
+ ProofEngineTypes.lazy_term ->
+ ProofEngineTypes.tactic