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Sema: initialize OPV comptime allocs correctly

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This was caused a `[0]std.builtin.Type.StructField.Attributes` to be
considered `undefined`, even though that type is OPV so should prefer
its OPV `.{}` over `undefined`.

Resolves: #30039
This commit is contained in:
Matthew Lugg 2025-11-29 11:55:36 +00:00
parent e52232cd57
commit 8f5db19791
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GPG key ID: 3F5B7DCCBF4AF02E
2 changed files with 12 additions and 1 deletions
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4
src/Sema.zig
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@ -175,9 +175,11 @@ const ComptimeAlloc = struct {
/// `src` may be `null` if `is_const` will be set. /// `src` may be `null` if `is_const` will be set.
fn newComptimeAlloc(sema: *Sema, block: *Block, src: LazySrcLoc, ty: Type, alignment: Alignment) !ComptimeAllocIndex { fn newComptimeAlloc(sema: *Sema, block: *Block, src: LazySrcLoc, ty: Type, alignment: Alignment) !ComptimeAllocIndex {
const pt = sema.pt;
const init_val = try sema.typeHasOnePossibleValue(ty) orelse try pt.undefValue(ty);
const idx = sema.comptime_allocs.items.len; const idx = sema.comptime_allocs.items.len;
try sema.comptime_allocs.append(sema.gpa, .{ try sema.comptime_allocs.append(sema.gpa, .{
.val = .{ .interned = try sema.pt.intern(.{ .undef = ty.toIntern() }) }, .val = .{ .interned = init_val.toIntern() },
.is_const = false, .is_const = false,
.src = src, .src = src,
.alignment = alignment, .alignment = alignment,

9
test/behavior/type.zig
View file

@ -427,3 +427,12 @@ test "undefined type value" {
}; };
comptime assert(@TypeOf(S.undef_type) == type); comptime assert(@TypeOf(S.undef_type) == type);
} }
test "reify struct with zero fields through const arrays" {
const names: [0][]const u8 = .{};
const types: [0]type = .{};
const attrs: [0]std.builtin.Type.StructField.Attributes = .{};
const S = @Struct(.auto, null, &names, &types, &attrs);
comptime assert(@typeInfo(S) == .@"struct");
comptime assert(@typeInfo(S).@"struct".fields.len == 0);
}