[2.0.0] Wrong minification

[madmoizo]

• Operating System: linux
• Node Version: 12.x
• terser webpack plugin: 2.0.0

Expected Behavior

v1.4.1 behavior

Actual Behavior

v2.0.0 behavior

syncQueueItems is not replaced by its minified name t
Result in ReferenceError: syncQueueItems is not defined

Code

Original code

try {
      const syncQueueItems = await this._getFromSyncQueue()
      const syncQueueItemsDeduplicated = []
      for (const { createdAt, modelName, primaryKey } of syncQueueItems) {

How Do We Reproduce?

No minimal reproduction yet

[alexander-akait]

Please open issue in terser package https://github.com/terser/terser

[alexander-akait]

/cc @fabiosantoscode

[fabiosantoscode]

Please update Terser to 4.3.1 which has been released to fix this issue.