From c532b1b819b3452062bc6552701ba58f87f12402 Mon Sep 17 00:00:00 2001
From: Steven Allen <steven@stebalien.com>
Date: Mon, 21 Jun 2021 11:25:03 -0700
Subject: [PATCH] fix(lotus-sim): remove unused field and function

---
 cmd/lotus-sim/simulation/simulation.go | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/cmd/lotus-sim/simulation/simulation.go b/cmd/lotus-sim/simulation/simulation.go
index 18ccf1c0c..c75be3261 100644
--- a/cmd/lotus-sim/simulation/simulation.go
+++ b/cmd/lotus-sim/simulation/simulation.go
@@ -16,7 +16,6 @@ import (
 
 	blockadt "github.com/filecoin-project/specs-actors/actors/util/adt"
 
-	"github.com/filecoin-project/lotus/chain/state"
 	"github.com/filecoin-project/lotus/chain/stmgr"
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/cmd/lotus-sim/simulation/stages"
@@ -80,7 +79,6 @@ type Simulation struct {
 	start  *types.TipSet
 
 	// head
-	st   *state.StateTree
 	head *types.TipSet
 
 	stages []stages.Stage
@@ -113,22 +111,6 @@ func (sim *Simulation) saveConfig() error {
 	return sim.MetadataDS.Put(sim.key("config"), buf)
 }
 
-// stateTree returns the current state-tree for the current head, computing the tipset if necessary.
-// The state-tree is cached until the head is changed.
-func (sim *Simulation) stateTree(ctx context.Context) (*state.StateTree, error) {
-	if sim.st == nil {
-		st, _, err := sim.StateManager.TipSetState(ctx, sim.head)
-		if err != nil {
-			return nil, err
-		}
-		sim.st, err = sim.StateManager.StateTree(st)
-		if err != nil {
-			return nil, err
-		}
-	}
-	return sim.st, nil
-}
-
 var simulationPrefix = datastore.NewKey("/simulation")
 
 // key returns the the key in the form /simulation/<subkey>/<simulation-name>. For example,
@@ -183,7 +165,6 @@ func (sim *Simulation) SetHead(head *types.TipSet) error {
 	if err := sim.storeNamedTipSet("head", head); err != nil {
 		return err
 	}
-	sim.st = nil // we'll compute this on-demand.
 	sim.head = head
 	return nil
 }