I’ve focussed mostly on how effects relate back to exceptions and async code, since those are control-flow constructs that I (and probably you) are most familiar with. I haven’t given much thought to what it would be like to write code where all I/O is handled through effects. If you had to annotate every single function and function call that you wanted to do I/O, I imagine that would get really tedious. If the language had good type inference on the required effects, then it might not be so bad.
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