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如何获得stack build转储 GHC 核心的命令？我试过这个，无济于事：
stack build
stack build :hello_world --ghc-options '-ddump-simpl'
确保之前清理过，或者通过 stack 选项--force-dirty和 ghc 选项强制重新编译-fforce-recomp。
--force-dirty
-fforce-recomp
这些文件被转储在.stack-work/dist/.../build/hello_world/hello_world-tmp/.
.stack-work/dist/.../build/hello_world/hello_world-tmp/