[BUG] Enum member called 's' is not possible

[threeifbyair]

Describe the bug
When declaring an enumeration, a member called 's' cannot be declared.

To Reproduce

https://cpp2.godbolt.org/z/eExnreoaT

foo : @enum type = { s; }

gives the following error:

main.cpp2: error: a type's implementation may not declare a name that is the same as (i.e., shadows) a type scope name - for example, a type scope function's local variable may not have the same as one of the type's members

's' is not mentioned among the illegal member names for an enumeration.

[gregmarr]

I believe that this happens due to these functions:

public: [[nodiscard]] static auto from_string(cpp2::impl::in<std::string_view> s) -> foo;
public: [[nodiscard]] static auto from_code(cpp2::impl::in<std::string_view> s) -> foo;