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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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toolchain/lower/testdata/interop/cpp/reference.carbon
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@@ -198,6 +198,7 @@ fn GetRefs() {
// CHECK:STDOUT: call void @_Z9TakeCRRefO1C.carbon_thunk(ptr %.loc19_18.2.temp), !dbg !25
// CHECK:STDOUT: call void @_Z13TakeConstCRefRK1C.carbon_thunk(ptr %c.var), !dbg !26
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !21
// CHECK:STDOUT: store i32 poison, ptr %n.var, align 4, !dbg !21
// CHECK:STDOUT: call void @_Z10TakeIntRefRi(ptr %n.var), !dbg !27
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc24_22.3.temp), !dbg !22
// CHECK:STDOUT: store i32 42, ptr %.loc24_22.3.temp, align 4, !dbg !22
@@ -365,6 +366,7 @@ fn GetRefs() {
// CHECK:STDOUT: call void @_Z9TakeCRRefRK1C10ForceThunk.carbon_thunk1(ptr %.loc20_18.2.temp), !dbg !27
// CHECK:STDOUT: call void @_Z13TakeConstCRefRK1C10ForceThunk.carbon_thunk1(ptr %c.var), !dbg !28
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %n.var), !dbg !23
// CHECK:STDOUT: store i32 poison, ptr %n.var, align 4, !dbg !23
// CHECK:STDOUT: call void @_Z10TakeIntRefRi10ForceThunk.carbon_thunk1(ptr %n.var), !dbg !29
// CHECK:STDOUT: call void @llvm.lifetime.start.p0(ptr %.loc25_22.3.temp), !dbg !24
// CHECK:STDOUT: store i32 42, ptr %.loc25_22.3.temp, align 4, !dbg !24