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Add rule that super in an extension type member is an error #3364

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Sep 21, 2023
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Add rule that super in an extension type member is an error #3364

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8 changes: 8 additions & 0 deletions accepted/future-releases/extension-types/feature-specification.md
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Expand Up @@ -1207,6 +1207,14 @@ superinterfaces `V1, .. Vk` is that the members declared by _DV_ as well as
all members of `V1, .. Vk` that are not redeclared by a declaration in _DV_
can be invoked on a receiver of the type introduced by _DV_.*

Finally, a compile-time error occurs if the body of an extension type member
contains `super`.

*For example, even in the case where a superinterface declares a member
named `m`, it is not possible to call it using `super.m(...)`. The
rationale for this rule is that there may be multiple superinterfaces
declaring a member with the same name.*


### Changes to other types and subtyping

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