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Extern unions should not trigger active field check

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Fixes #3378
This commit is contained in:
LemonBoy 2019-10-10 10:47:59 +02:00 committed by Andrew Kelley
parent 4e81df12c3
commit 6cbb732b59
2 changed files with 11 additions and 1 deletions
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2
src/ir.cpp
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@ -17951,7 +17951,7 @@ static IrInstruction *ir_analyze_container_field_ptr(IrAnalyze *ira, Buf *field_
union_val->special = ConstValSpecialStatic;
bigint_init_bigint(&union_val->data.x_union.tag, &field->enum_field->value);
union_val->data.x_union.payload = payload_val;
} else {
} else if (bare_type->data.unionation.layout != ContainerLayoutExtern) {
TypeUnionField *actual_field = find_union_field_by_tag(bare_type, &union_val->data.x_union.tag);
if (actual_field == nullptr)
zig_unreachable();

10
test/stage1/behavior/union.zig
View File

@ -511,3 +511,13 @@ test "union with comptime_int tag" {
};
comptime expect(@TagType(@TagType(Union)) == comptime_int);
}
test "extern union doesn't trigger field check at comptime" {
const U = extern union {
x: u32,
y: u8,
};
const x = U{ .x = 0x55AAAA55 };
comptime expect(x.y == 0x55);
}