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Unwrap the struct inside a single-tag union

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This commit is contained in:
Richard Feldman 2020-07-07 22:07:34 -04:00
parent 2337d6638e
commit cdce98d14f
2 changed files with 23 additions and 11 deletions
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8
compiler/mono/src/layout.rs
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@ -547,7 +547,13 @@ pub fn layout_from_tag_union<'a>(
Unit => Layout::Struct(&[]),
BoolUnion { .. } => Layout::Builtin(Builtin::Int1),
ByteUnion(_) => Layout::Builtin(Builtin::Int8),
Unwrapped(field_layouts) => Layout::Struct(field_layouts.into_bump_slice()),
Unwrapped(mut field_layouts) => {
if field_layouts.len() == 1 {
field_layouts.pop().unwrap()
} else {
Layout::Struct(field_layouts.into_bump_slice())
}
}
Wrapped(tags) => {
let mut tag_layouts = Vec::with_capacity_in(tags.len(), arena);