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TopEnvFrag was very confusing, because even though it used to carry a ModuleEnv, many elements of that ModuleEnv (source map, synthesis candidates, ...) would be expected to not include any imported values! I lost some time thanks to this unstated invariant, so I figured it's a good time to clean it up! With this change `TopEnvFrag` directly mimics the structure of `Env`, and includes top emissions separately from module-level emissions. And module-level emissions are no longer represented by a `ModuleEnv`, but by a `ModuleEmissions` ADT that explicitly states the relevant invariants.
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TopEnvFrag was very confusing, because even though it used to carry a
ModuleEnv, many elements of that ModuleEnv (source map, synthesis candidates, ...)
would be expected to not include any imported values! I lost some time
thanks to this unstated invariant, so I figured it's a good time to
clean it up!
With this change
TopEnvFragdirectly mimics the structure ofEnv,and includes top emissions separately from module-level emissions. And
module-level emissions are no longer represented by a
ModuleEnv, butby a
ModuleEmissionsADT that explicitly states the relevantinvariants.