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gccrs: Emit error when tuple-indexing on non-tuples #4205

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gccrs: Emit error when tuple-indexing on non-tuples #4205

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8 changes: 7 additions & 1 deletion gcc/rust/typecheck/rust-hir-type-check-expr.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -126,7 +126,13 @@ TypeCheckExpr::visit (HIR::TupleIndexExpr &expr)
}

TyTy::ADTType *adt = static_cast<TyTy::ADTType *> (resolved);
rust_assert (!adt->is_enum ());
if (!adt->is_tuple_struct ())
{
rust_error_at (expr.get_locus (),
"expected tuple or tuple struct, found %qs",
adt->get_name ().c_str ());
return;
}
rust_assert (adt->number_of_variants () == 1);

TyTy::VariantDef *variant = adt->get_variants ().at (0);
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15 changes: 15 additions & 0 deletions gcc/testsuite/rust/compile/tuple_index_on_non_tuple.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
enum E {
V(usize),
}

struct S {
field: i32,
}

fn main() {
let e = E::V(0);
let _ = e.0; // { dg-error "expected tuple or tuple struct, found 'E'" }

let s = S { field: 0 };
let _ = s.0; // { dg-error "expected tuple or tuple struct, found 'S'" }
}
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