更新Flutter到1.20.2后（也尝试了1.20.1）应用程序无法在发布模式下构建android apk。
之后

flutter build apk

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我出错了

Script '/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 896

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之后呢

flutter build apk -v

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构建错误

[   +1 ms] [        ] Failed to subset font; aborting.
[   +2 ms] [   +8 ms] Target aot_android_asset_bundle failed: FontSubset error: Font subsetting failed with exit code 255.
[        ]            #0      IconTreeShaker.subsetFont (package:flutter_tools/src/build_system/targets/icon_tree_shaker.dart:213:7)

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附言
更新Flutter到1.20.1后，图标树振动器的问题也出现在iOS上-但this issue有解决方案