+ hsc_OptFuel :: OptFuelState,
+ -- Settings to control the use of optimization fuel:
+ -- by limiting the number of transformations,
+ -- we can use binary search to help find compiler bugs.
+
+ hsc_type_env_var :: Maybe (Module, IORef TypeEnv),
+ -- Used for one-shot compilation only, to initialise
+ -- the IfGblEnv. See TcRnTypes.TcGblEnv.tcg_type_env_var
+