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Explain how we encode enums at the encoding site

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This commit is contained in:
Oli Scherer 2021-03-15 11:52:26 +00:00
parent f646c1e434
commit c01c49430c
1 changed files with 4 additions and 3 deletions
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7
compiler/rustc_mir/src/const_eval/mod.rs
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@ -69,10 +69,11 @@ fn const_to_valtree_inner<'tcx>(
let field = ecx.mplace_field(&place, i).unwrap(); let field = ecx.mplace_field(&place, i).unwrap();
const_to_valtree_inner(ecx, &field) const_to_valtree_inner(ecx, &field)
}); });
// For enums, we preped their variant index before the variant's fields so we can figure out
// the variant again when just seeing a valtree.
let branches = variant.into_iter().chain(fields);
Some(ty::ValTree::Branch( Some(ty::ValTree::Branch(
ecx.tcx ecx.tcx.arena.alloc_from_iter(branches.collect::<Option<Vec<_>>>()?),
.arena
.alloc_from_iter(variant.into_iter().chain(fields).collect::<Option<Vec<_>>>()?),
)) ))
}; };
match place.layout.ty.kind() { match place.layout.ty.kind() {