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chore: legitimize projections on tagged values #11586

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Merged
hargoniX merged 1 commit into from
Dec 10, 2025
Merged

chore: legitimize projections on tagged values #11586

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6 changes: 6 additions & 0 deletions src/Lean/Compiler/IR/Checker.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -159,6 +159,11 @@ def checkExpr (ty : IRType) (e : Expr) : M Unit := do
checkObjVar x
| .proj i x =>
let xType ← getType x;
/-
Projections are a valid operation on `tobject`. Thus they should also
be a valid operation for both `object`, `tagged` and unboxed values
as they are subtypes.
-/
match xType with
| .object | .tobject =>
checkObjType ty
Expand All @@ -167,6 +172,7 @@ def checkExpr (ty : IRType) (e : Expr) : M Unit := do
checkEqTypes (tys[i]) ty
else
throwCheckerError "invalid proj index"
| .tagged => pure ()
| _ => throwCheckerError s!"unexpected IR type '{xType}'"
| .uproj _ x =>
checkObjVar x
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