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create NullableUnion in some cases

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Folkert 2021-01-15 01:02:34 +01:00
parent b47ccb20fd
commit 51cad15399
3 changed files with 41 additions and 2 deletions
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16
compiler/mono/src/decision_tree.rs
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@ -1007,6 +1007,22 @@ fn path_to_expr_help<'a>(
Layout::Union(layouts) | Layout::RecursiveUnion(layouts) => {
layouts[*tag_id as usize]
}
Layout::NullableUnion {
nullable_id,
nullable_layout,
foo: layouts,
..
} => {
use std::cmp::Ordering;
match (*tag_id as usize).cmp(&(*nullable_id as usize)) {
Ordering::Equal => {
&*env.arena.alloc([Layout::Builtin(nullable_layout.clone())])
}
Ordering::Less => layouts[*tag_id as usize],
Ordering::Greater => layouts[*tag_id as usize - 1],
}
}
Layout::Struct(layouts) => layouts,
other => env.arena.alloc([other.clone()]),
};