[Issue 23091] importC: string literals no longer convert to D string type

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23091

--- Comment #2 from Walter Bright <bugzilla at digitalmars.com> ---
`string` is (immutable char)[], which is not a C type, and so there's not much
of anything C can do with it.

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