Hello, While compiling the `record` package with ghc-8 rc3 with `stack build`, the memory usage went above 6gb and started trashing. But when `stack build --fast` (-O0) was being used the package compiled with maximum memory at 1.8gb.
Also `stack build` works fine with ghc-7.10.3 with the build taking about 1.7gb. Attached is the stack file to reproduce the issue. Steps to reproduce: 1. Create a new directory and put the attached stack.yaml there. 2. run `stack build` - this will thrash after some time 3. run `stack build --fast` - this will succeed 4. run `stack build --resolver=ghc-7.10.3` - this will succeed as well
stack.yaml
Description: application/yaml
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