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fix for when C has to return an empty tag union

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Folkert 2023-02-15 15:17:29 +01:00
parent b6bae82913
commit edf557e480
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2 changed files with 24 additions and 7 deletions
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4
crates/compiler/gen_llvm/src/llvm/convert.rs
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@ -65,6 +65,7 @@ pub fn struct_type_from_union_layout<'a, 'ctx, 'env>(
use UnionLayout::*;
match union_layout {
NonRecursive([]) => env.context.struct_type(&[], false),
NonRecursive(tags) => {
RocUnion::tagged_from_slices(layout_interner, env.context, tags, env.target_info)
.struct_type()
@ -300,7 +301,8 @@ impl<'ctx> RocUnion<'ctx> {
target_info: TargetInfo,
) -> Self {
let tag_type = match layouts.len() {
0..=255 => TagType::I8,
0 => unreachable!("zero-element tag union is not represented as a RocUnion"),
1..=255 => TagType::I8,
_ => TagType::I16,
};