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Optional types in type parameters
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The easiest solution is probably to just require either:
1) both the parameter declaration and the usage to be optional, or
2) none of them to be optional.
For example:
type List<ref T> = ...
type Slot<ref? T> = ...
func f(ref List<ref Thing> l)
func g(ref Slot<ref? Thing> s)
How about merging with word-sized or smaller types?
- Merging should ONLY be allowed for non-optional types
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