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Add an interface for initialization of vars without an explicit initializer (#6934)

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When a `var` is not explicitly given an initializer, initialize it in
one of two ways:

* If its type implements the new interface `Core.Default`, call
`Core.Default.Op` to initialize it.
* Otherwise, if its type implements `UnformedInit`, leave it in an
unformed state. For now, this is always an uninitialized state, but that
will change in the future.
* If neither of those apply, the `var` declaration is ill-formed.

This is a step towards implementing leads decision #6739 and proposals
#257 and #5913.

Assisted-by: Gemini 3.1 Pro via Antigravity

---------

Co-authored-by: Geoff Romer <gromer@google.com>
This commit is contained in:
Richard Smith
2026-03-19 23:46:06 +00:00
committed by GitHub
co-authored by Geoff Romer
parent fd2d210c63
commit ce50f181f1
146 changed files with 5226 additions and 3535 deletions
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examples/interop/cpp/socket.carbon
+3 -2
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@@ -40,8 +40,9 @@ fn Run() -> i32 {
return 1;
}
// TODO: Should be able to zero-initialize this with `= ()` or `= {}`.
var address: Cpp.sockaddr_in6;
// TODO: This initialization should zero-initialize the struct.
// TODO: We should be able to use simply `= ()` or `= {}` to get the same effect.
var address: Cpp.sockaddr_in6 = Cpp.sockaddr_in6.sockaddr_in6();
Cpp.memset(&address, 0, Cpp.SOCKADDR_IN_SIZE);
// TODO: Should this be valid without a cast? `AF_INET6` is defined to an
// integer literal in glibc at least, but we import it as an `i32`.