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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/check/testdata/struct/fail_nested_incomplete.carbon
Vendored
+1
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@@ -67,6 +67,7 @@ var p: Incomplete* = &s.a;
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: assign file.%s.var, <error>
// CHECK:STDOUT: %s.ref: ref <error> = name_ref s, file.%s [concrete = <error>]
// CHECK:STDOUT: %a.ref: <error> = name_ref a, <error> [concrete = <error>]
// CHECK:STDOUT: %addr: <error> = addr_of %a.ref [concrete = <error>]
toolchain/check/testdata/struct/fail_value_as_type.carbon
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+6
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@@ -59,3 +59,9 @@ var x: {.a = 1};
// CHECK:STDOUT: %x: ref <error> = ref_binding x, <error> [concrete = <error>]
// CHECK:STDOUT: }
// CHECK:STDOUT:
// CHECK:STDOUT: fn @__global_init() {
// CHECK:STDOUT: !entry:
// CHECK:STDOUT: assign file.%x.var, <error>
// CHECK:STDOUT: return
// CHECK:STDOUT: }
// CHECK:STDOUT: