On Thu, 10 Nov 2022, Patrick Palka wrote:
> AFAICT the only purpose of tsubst_copy_and_build's
> integral_constant_expression_p boolean parameter is to diagnose certain
> constructs that aren't allowed to appear in a C++98 integral constant
> expression context, specifically casts to a non-integral type (diagnosed
> from the *_CAST_EXPR case of tsubst_copy_and_build) or dependent names
> that resolve to a non-constant decl (diagnosed from the IDENTIFIER_NODE
> case of tsubst_copy_and_build). The parameter has no effect outside of
> C++98 AFAICT.
I should add that the parameter was added to tsubst_copy_and_build
by r116276 which predates the constexpr machinery.
>
> But diagnosing such constructs should arguably be done by
> is_constant_expression after substitution, and doing it during
> substitution by way of an additional parameter complicates the API of
> this workhouse function for functionality that's specific to C++98.
> And it seems is_constant_expression already does a good job of diagnosing
> the aforementioned two constructs in C++98 mode, at least as far as our
> testsuite is concerned.
>
> So this patch gets rid of this parameter from tsubst_copy_and_build,
> tsubst_expr and tsubst_copy_and_build_call_args. The only interesting
> changes are those to potential_constant_expression_1 and the
> IDENTIFIER_NODE and *_CAST_EXPR cases of tsubst_copy_and_build; the rest
> are mechanical adjustments to these functions and their call sites.
>
> Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for
> trunk?
>
> gcc/cp/ChangeLog:
>
> * constexpr.cc (potential_constant_expression_1)
> <case *_CAST_EXPR>: Use
> cast_valid_in_integral_constant_expression_p instead of
> open coding it.
> * constraint.cc (tsubst_valid_expression_requirement): Adjust
> calls to tsubst_copy_and_build and tsubst_expr.
> (tsubst_constraint): Likewise.
> (satisfy_atom): Likewise.
> (diagnose_trait_expr): Likewise.
> * cp-tree.h (tsubst_copy_and_build): Remove i_c_e_p parameter.
> (tsubst_expr): Likewise.
> * init.cc (get_nsdmi): Adjust calls to tsubst_copy_and_build
> and tsubst_expr.
> * pt.cc (expand_integer_pack): Likewise.
> (instantiate_non_dependent_expr_internal): Likewise.
> (tsubst_friend_function): Likewise.
> (tsubst_attribute): Likewise.
> (instantiate_class_template): Likewise.
> (tsubst_template_arg): Likewise.
> (gen_elem_of_pack_expansion_instantiation): Likewise.
> (tsubst_fold_expr_init): Likewise.
> (tsubst_pack_expansion): Likewise.
> (tsubst_default_argument): Likewise.
> (tsubst_function_decl): Likewise.
> (tsubst_decl): Likewise.
> (tsubst_arg_types): Likewise.
> (tsubst_exception_specification): Likewise.
> (tsubst): Likewise.
> (tsubst_init): Likewise.
> (tsubst_copy): Likewise.
> (tsubst_omp_clause_decl): Likewise.
> (tsubst_omp_clauses): Likewise.
> (tsubst_copy_asm_operands): Likewise.
> (tsubst_omp_for_iterator): Likewise.
> (tsubst_expr): Likewise. Remove i_c_e_p parameter.
> (tsubst_omp_udr): Likewise.
> (tsubst_non_call_postfix_expression): Likewise. Remove i_c_e_p
> parameter.
> (tsubst_lambda_expr): Likewise.
> (tsubst_copy_and_build_call_args): Likewise.
> (tsubst_copy_and_build): Likewise. Remove i_c_e_p parameter.
> <case IDENTIFIER_NODE>: Adjust call to finish_id_expression
> following removal of i_c_e_p.
> <case *_CAST_EXPR>: Remove C++98-specific cast validity check
> guarded by i_c_e_p.
> (maybe_instantiate_noexcept): Adjust calls to
> tsubst_copy_and_build and tsubst_expr.
> (instantiate_body): Likewise.
> (instantiate_decl): Likewise.
> (tsubst_initializer_list): Likewise.
> (tsubst_enum): Likewise.
>
> gcc/objcp/ChangeLog:
>
> * objcp-lang.cc (objcp_tsubst_copy_and_build): Likewise.
>
> gcc/testsuite/ChangeLog:
>
> * g++.dg/template/crash55.C: Don't expect additional
> C++98-specific diagnostics.
> * g++.dg/template/ref3.C: Remove C++98-specific xfail.
> ---
> gcc/cp/constexpr.cc | 4 +-
> gcc/cp/constraint.cc | 14 +-
> gcc/cp/cp-tree.h | 6 +-
> gcc/cp/init.cc | 6 +-
> gcc/cp/pt.cc | 240 ++++++++----------------
> gcc/objcp/objcp-lang.cc | 3 +-
> gcc/testsuite/g++.dg/template/crash55.C | 3 +-
> gcc/testsuite/g++.dg/template/ref3.C | 3 +-
> 8 files changed, 93 insertions(+), 186 deletions(-)
>
> diff --git a/gcc/cp/constexpr.cc b/gcc/cp/constexpr.cc
> index 15b4f2c4a08..e665839f5b1 100644
> --- a/gcc/cp/constexpr.cc
> +++ b/gcc/cp/constexpr.cc
> @@ -9460,9 +9460,7 @@ potential_constant_expression_1 (tree t, bool
> want_rval, bool strict, bool now,
> case STATIC_CAST_EXPR:
> case REINTERPRET_CAST_EXPR:
> case IMPLICIT_CONV_EXPR:
> - if (cxx_dialect < cxx11
> - && !dependent_type_p (TREE_TYPE (t))
> - && !INTEGRAL_OR_ENUMERATION_TYPE_P (TREE_TYPE (t)))
> + if (!cast_valid_in_integral_constant_expression_p (TREE_TYPE (t)))
> /* In C++98, a conversion to non-integral type can't be part of a
> constant expression. */
> {
> diff --git a/gcc/cp/constraint.cc b/gcc/cp/constraint.cc
> index f6ef078171a..3ddbd535330 100644
> --- a/gcc/cp/constraint.cc
> +++ b/gcc/cp/constraint.cc
> @@ -1921,7 +1921,7 @@ hash_placeholder_constraint (tree c)
> static tree
> tsubst_valid_expression_requirement (tree t, tree args, sat_info info)
> {
> - tree r = tsubst_expr (t, args, tf_none, info.in_decl, false);
> + tree r = tsubst_expr (t, args, tf_none, info.in_decl);
> if (convert_to_void (r, ICV_STATEMENT, tf_none) != error_mark_node)
> return r;
>
> @@ -1932,7 +1932,7 @@ tsubst_valid_expression_requirement (tree t, tree args,
> sat_info info)
> {
> inform (loc, "the required expression %qE is invalid, because", t);
> if (r == error_mark_node)
> - tsubst_expr (t, args, info.complain, info.in_decl, false);
> + tsubst_expr (t, args, info.complain, info.in_decl);
> else
> convert_to_void (r, ICV_STATEMENT, info.complain);
> }
> @@ -1941,7 +1941,7 @@ tsubst_valid_expression_requirement (tree t, tree args,
> sat_info info)
> }
> else if (info.noisy ())
> {
> - r = tsubst_expr (t, args, info.complain, info.in_decl, false);
> + r = tsubst_expr (t, args, info.complain, info.in_decl);
> convert_to_void (r, ICV_STATEMENT, info.complain);
> }
>
> @@ -2706,7 +2706,7 @@ tsubst_constraint (tree t, tree args, tsubst_flags_t
> complain, tree in_decl)
> constraint-expressions of a declaration. */
> processing_constraint_expression_sentinel s;
> cp_unevaluated u;
> - tree expr = tsubst_expr (t, args, complain, in_decl, false);
> + tree expr = tsubst_expr (t, args, complain, in_decl);
> return expr;
> }
>
> @@ -2954,13 +2954,13 @@ satisfy_atom (tree t, tree args, sat_info info)
>
> /* Apply the parameter mapping (i.e., just substitute). */
> tree expr = ATOMIC_CONSTR_EXPR (t);
> - tree result = tsubst_expr (expr, args, quiet.complain, quiet.in_decl,
> false);
> + tree result = tsubst_expr (expr, args, quiet.complain, quiet.in_decl);
> if (result == error_mark_node)
> {
> /* If substitution results in an invalid type or expression, the
> constraint
> is not satisfied. Replay the substitution. */
> if (info.diagnose_unsatisfaction_p ())
> - tsubst_expr (expr, args, info.complain, info.in_decl, false);
> + tsubst_expr (expr, args, info.complain, info.in_decl);
> return cache.save (inst_cache.save (boolean_false_node));
> }
>
> @@ -3587,7 +3587,7 @@ diagnose_trait_expr (tree expr, tree args)
> /* Build a "fake" version of the instantiated trait, so we can
> get the instantiated types from result. */
> ++processing_template_decl;
> - expr = tsubst_expr (expr, args, tf_none, NULL_TREE, false);
> + expr = tsubst_expr (expr, args, tf_none, NULL_TREE);
> --processing_template_decl;
>
> tree t1 = TRAIT_EXPR_TYPE1 (expr);
> diff --git a/gcc/cp/cp-tree.h b/gcc/cp/cp-tree.h
> index 40fd2e1ebb9..7ff3206e245 100644
> --- a/gcc/cp/cp-tree.h
> +++ b/gcc/cp/cp-tree.h
> @@ -7382,10 +7382,8 @@ extern void instantiate_pending_templates (int);
> extern tree tsubst_default_argument (tree, int, tree, tree,
> tsubst_flags_t);
> extern tree tsubst (tree, tree, tsubst_flags_t, tree);
> -extern tree tsubst_copy_and_build (tree, tree, tsubst_flags_t,
> - tree, bool = false);
> -extern tree tsubst_expr (tree, tree, tsubst_flags_t,
> - tree, bool);
> +extern tree tsubst_copy_and_build (tree, tree, tsubst_flags_t,
> tree);
> +extern tree tsubst_expr (tree, tree, tsubst_flags_t,
> tree);
> extern tree tsubst_pack_expansion (tree, tree, tsubst_flags_t,
> tree);
> extern tree tsubst_argument_pack (tree, tree, tsubst_flags_t,
> tree);
> extern tree tsubst_template_args (tree, tree, tsubst_flags_t,
> tree);
> diff --git a/gcc/cp/init.cc b/gcc/cp/init.cc
> index fee49090de7..2fff4ad2dc7 100644
> --- a/gcc/cp/init.cc
> +++ b/gcc/cp/init.cc
> @@ -620,10 +620,8 @@ get_nsdmi (tree member, bool in_ctor, tsubst_flags_t
> complain)
> start_lambda_scope (member);
>
> /* Do deferred instantiation of the NSDMI. */
> - init = (tsubst_copy_and_build
> - (init, DECL_TI_ARGS (member),
> - complain, member,
> - /*integral_constant_expression_p=*/false));
> + init = tsubst_copy_and_build (init, DECL_TI_ARGS (member),
> + complain, member);
> init = digest_nsdmi_init (member, init, complain);
>
> finish_lambda_scope ();
> diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc
> index bcc275f8b6e..e3d311b0a8b 100644
> --- a/gcc/cp/pt.cc
> +++ b/gcc/cp/pt.cc
> @@ -3772,8 +3772,7 @@ expand_integer_pack (tree call, tree args,
> tsubst_flags_t complain,
> tree in_decl)
> {
> tree ohi = CALL_EXPR_ARG (call, 0);
> - tree hi = tsubst_copy_and_build (ohi, args, complain, in_decl,
> - true/*int_cst*/);
> + tree hi = tsubst_copy_and_build (ohi, args, complain, in_decl);
>
> if (instantiation_dependent_expression_p (hi))
> {
> @@ -6360,8 +6359,7 @@ instantiate_non_dependent_expr_internal (tree expr,
> tsubst_flags_t complain)
> return tsubst_copy_and_build (expr,
> /*args=*/NULL_TREE,
> complain,
> - /*in_decl=*/NULL_TREE,
> - /*integral_constant_expression_p=*/true);
> + /*in_decl=*/NULL_TREE);
> }
>
> /* Instantiate the non-dependent expression EXPR. */
> @@ -11195,8 +11193,7 @@ tsubst_friend_function (tree decl, tree args)
> current class with same name. */
> push_nested_namespace (ns);
> fns = tsubst_expr (DECL_TI_TEMPLATE (decl), args,
> - tf_warning_or_error, NULL_TREE,
> - /*integral_constant_expression_p=*/false);
> + tf_warning_or_error, NULL_TREE);
> pop_nested_namespace (ns);
> arglist = tsubst (DECL_TI_ARGS (decl), args,
> tf_warning_or_error, NULL_TREE);
> @@ -11609,9 +11606,7 @@ tsubst_attribute (tree t, tree *decl_p, tree args,
> get_attribute_name (t)))
> {
> ++cp_unevaluated_operand;
> - tree varid
> - = tsubst_expr (TREE_PURPOSE (val), args, complain,
> - in_decl, /*integral_constant_expression_p=*/false);
> + tree varid = tsubst_expr (TREE_PURPOSE (val), args, complain, in_decl);
> --cp_unevaluated_operand;
> tree chain = TREE_CHAIN (val);
> location_t match_loc = cp_expr_loc_or_input_loc (TREE_PURPOSE (chain));
> @@ -11647,7 +11642,7 @@ tsubst_attribute (tree t, tree *decl_p, tree args,
> tree v = TREE_VALUE (t3);
> if (TREE_CODE (v) == STRING_CST && allow_string)
> continue;
> - v = tsubst_expr (v, args, complain, in_decl, true);
> + v = tsubst_expr (v, args, complain, in_decl);
> v = fold_non_dependent_expr (v);
> if (!INTEGRAL_TYPE_P (TREE_TYPE (v))
> || (TREE_PURPOSE (t3) == score
> @@ -11693,8 +11688,7 @@ tsubst_attribute (tree t, tree *decl_p, tree args,
> else if (attribute_takes_identifier_p (get_attribute_name (t)))
> {
> tree chain
> - = tsubst_expr (TREE_CHAIN (val), args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + = tsubst_expr (TREE_CHAIN (val), args, complain, in_decl);
> if (chain != TREE_CHAIN (val))
> val = tree_cons (NULL_TREE, TREE_VALUE (val), chain);
> }
> @@ -11717,8 +11711,7 @@ tsubst_attribute (tree t, tree *decl_p, tree args,
> return list;
> }
> else
> - val = tsubst_expr (val, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + val = tsubst_expr (val, args, complain, in_decl);
>
> if (val == error_mark_node)
> return error_mark_node;
> @@ -12160,8 +12153,7 @@ instantiate_class_template (tree type)
> {
> /* Build new TYPE_FIELDS. */
> if (TREE_CODE (t) == STATIC_ASSERT)
> - tsubst_expr (t, args, tf_warning_or_error, NULL_TREE,
> - /*integral_constant_expression_p=*/true);
> + tsubst_expr (t, args, tf_warning_or_error, NULL_TREE);
> else if (TREE_CODE (t) != CONST_DECL)
> {
> tree r;
> @@ -12418,8 +12410,7 @@ tsubst_template_arg (tree t, tree args,
> tsubst_flags_t complain, tree in_decl)
> {
> if (!(complain & tf_warning))
> ++c_inhibit_evaluation_warnings;
> - r = tsubst_expr (t, args, complain, in_decl,
> - /*integral_constant_expression_p=*/true);
> + r = tsubst_expr (t, args, complain, in_decl);
> if (!(complain & tf_warning))
> --c_inhibit_evaluation_warnings;
> }
> @@ -12683,8 +12674,7 @@ gen_elem_of_pack_expansion_instantiation (tree
> pattern,
> else if (pattern == error_mark_node)
> t = error_mark_node;
> else if (!TYPE_P (pattern))
> - t = tsubst_expr (pattern, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + t = tsubst_expr (pattern, args, complain, in_decl);
> else
> {
> t = tsubst (pattern, args, complain, in_decl);
> @@ -12778,7 +12768,7 @@ tsubst_fold_expr_pack (tree t, tree args,
> tsubst_flags_t complain, tree in_decl)
> static inline tree
> tsubst_fold_expr_init (tree t, tree args, tsubst_flags_t complain, tree
> in_decl)
> {
> - return tsubst_expr (FOLD_EXPR_INIT (t), args, complain, in_decl, false);
> + return tsubst_expr (FOLD_EXPR_INIT (t), args, complain, in_decl);
> }
>
> /* Expand a PACK of arguments into a grouped as left fold.
> @@ -13147,12 +13137,12 @@ tsubst_pack_expansion (tree t, tree args,
> tsubst_flags_t complain,
> if (BASES_DIRECT (parm_pack))
> return calculate_direct_bases (tsubst_expr (BASES_TYPE (parm_pack),
> args, complain,
> - in_decl, false),
> + in_decl),
> complain);
> else
> return calculate_bases (tsubst_expr (BASES_TYPE (parm_pack),
> - args, complain, in_decl,
> - false), complain);
> + args, complain, in_decl),
> + complain);
> }
> else if (builtin_pack_call_p (parm_pack))
> {
> @@ -13326,8 +13316,7 @@ tsubst_pack_expansion (tree t, tree args,
> tsubst_flags_t complain,
> pattern and return a PACK_EXPANSION_*. The caller will need to
> deal with that. */
> if (TREE_CODE (t) == EXPR_PACK_EXPANSION)
> - result = tsubst_expr (pattern, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + result = tsubst_expr (pattern, args, complain, in_decl);
> else
> result = tsubst (pattern, args, complain, in_decl);
> result = make_pack_expansion (result, complain);
> @@ -13901,9 +13890,7 @@ tsubst_default_argument (tree fn, int parmnum, tree
> type, tree arg,
> the body of function so as to avoid collecting live data on the
> stack. */
> ++function_depth;
> - arg = tsubst_expr (arg, DECL_TI_ARGS (fn),
> - complain, NULL_TREE,
> - /*integral_constant_expression_p=*/false);
> + arg = tsubst_expr (arg, DECL_TI_ARGS (fn), complain, NULL_TREE);
> --function_depth;
>
> finish_lambda_scope ();
> @@ -14208,8 +14195,7 @@ tsubst_function_decl (tree t, tree args,
> tsubst_flags_t complain,
> if (DECL_HAS_DEPENDENT_EXPLICIT_SPEC_P (t))
> {
> tree spec = lookup_explicit_specifier (t);
> - spec = tsubst_copy_and_build (spec, args, complain, in_decl,
> - /*i_c_e_p=*/true);
> + spec = tsubst_copy_and_build (spec, args, complain, in_decl);
> spec = build_explicit_specifier (spec, complain);
> if (spec == error_mark_node)
> return error_mark_node;
> @@ -14821,8 +14807,7 @@ tsubst_decl (tree t, tree args, tsubst_flags_t
> complain)
> number of bits. */
> DECL_BIT_FIELD_REPRESENTATIVE (r)
> = tsubst_expr (DECL_BIT_FIELD_REPRESENTATIVE (t), args,
> - complain, in_decl,
> - /*integral_constant_expression_p=*/true);
> + complain, in_decl);
> if (DECL_INITIAL (t))
> {
> /* Set up DECL_TEMPLATE_INFO so that we can get at the
> @@ -15074,8 +15059,7 @@ tsubst_decl (tree t, tree args, tsubst_flags_t
> complain)
> bool nop = (TREE_CODE (ve) == NOP_EXPR);
> if (nop)
> ve = TREE_OPERAND (ve, 0);
> - ve = tsubst_expr (ve, args, complain, in_decl,
> - /*constant_expression_p=*/false);
> + ve = tsubst_expr (ve, args, complain, in_decl);
> if (REFERENCE_REF_P (ve))
> {
> gcc_assert (TYPE_REF_P (type));
> @@ -15273,8 +15257,7 @@ tsubst_arg_types (tree arg_types,
> if (lambda_fn_in_template_p (in_decl)
> || (in_decl && TREE_CODE (in_decl) == FUNCTION_DECL
> && DECL_LOCAL_DECL_P (in_decl)))
> - default_arg = tsubst_copy_and_build (default_arg, args, complain,
> in_decl,
> - false/*constexpr*/);
> + default_arg = tsubst_copy_and_build (default_arg, args, complain,
> in_decl);
>
> tree remaining_arg_types = tsubst_arg_types (TREE_CHAIN (arg_types),
> args, end, complain, in_decl);
> @@ -15455,9 +15438,7 @@ tsubst_exception_specification (tree fntype,
> args);
> expr = DEFERRED_NOEXCEPT_PATTERN (expr);
> }
> - new_specs = tsubst_copy_and_build
> - (expr, args, complain, in_decl,
> - /*integral_constant_expression_p=*/true);
> + new_specs = tsubst_copy_and_build (expr, args, complain, in_decl);
> }
> new_specs = build_noexcept_spec (new_specs, complain);
> /* We've instantiated a template before a noexcept-specifier
> @@ -15764,8 +15745,7 @@ tsubst (tree t, tree args, tsubst_flags_t complain,
> tree in_decl)
> {
> tree max, omax = TREE_OPERAND (TYPE_MAX_VALUE (t), 0);
>
> - max = tsubst_expr (omax, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + max = tsubst_expr (omax, args, complain, in_decl);
>
> /* Fix up type of the magic NOP_EXPR with TREE_SIDE_EFFECTS if
> needed. */
> @@ -16358,9 +16338,7 @@ tsubst (tree t, tree args, tsubst_flags_t complain,
> tree in_decl)
> ++cp_unevaluated_operand;
> ++c_inhibit_evaluation_warnings;
>
> - type = tsubst_expr (TYPEOF_TYPE_EXPR (t), args,
> - complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + type = tsubst_expr (TYPEOF_TYPE_EXPR (t), args, complain, in_decl);
>
> --cp_unevaluated_operand;
> --c_inhibit_evaluation_warnings;
> @@ -16380,8 +16358,7 @@ tsubst (tree t, tree args, tsubst_flags_t complain,
> tree in_decl)
> ++c_inhibit_evaluation_warnings;
>
> type = tsubst_copy_and_build (DECLTYPE_TYPE_EXPR (t), args,
> - complain|tf_decltype, in_decl,
> - /*integral_constant_expression*/false);
> + complain|tf_decltype, in_decl);
>
> --cp_unevaluated_operand;
> --c_inhibit_evaluation_warnings;
> @@ -16840,7 +16817,7 @@ tsubst_init (tree init, tree decl, tree args,
> if (!init)
> return NULL_TREE;
>
> - init = tsubst_expr (init, args, complain, in_decl, false);
> + init = tsubst_expr (init, args, complain, in_decl);
>
> tree type = TREE_TYPE (decl);
>
> @@ -17677,9 +17654,7 @@ tsubst_copy (tree t, tree args, tsubst_flags_t
> complain, tree in_decl)
> return t;
>
> case CO_AWAIT_EXPR:
> - return tsubst_expr (t, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> - break;
> + return tsubst_expr (t, args, complain, in_decl);
>
> default:
> /* We shouldn't get here, but keep going if !flag_checking. */
> @@ -17719,14 +17694,11 @@ tsubst_omp_clause_decl (tree decl, tree args,
> tsubst_flags_t complain,
> DECL_CONTEXT (TREE_VEC_ELT (*tp, 0)) = current_function_decl;
> pushdecl (TREE_VEC_ELT (*tp, 0));
> TREE_VEC_ELT (*tp, 1)
> - = tsubst_expr (TREE_VEC_ELT (it, 1), args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + = tsubst_expr (TREE_VEC_ELT (it, 1), args, complain, in_decl);
> TREE_VEC_ELT (*tp, 2)
> - = tsubst_expr (TREE_VEC_ELT (it, 2), args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + = tsubst_expr (TREE_VEC_ELT (it, 2), args, complain, in_decl);
> TREE_VEC_ELT (*tp, 3)
> - = tsubst_expr (TREE_VEC_ELT (it, 3), args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + = tsubst_expr (TREE_VEC_ELT (it, 3), args, complain, in_decl);
> TREE_CHAIN (*tp) = NULL_TREE;
> tp = &TREE_CHAIN (*tp);
> }
> @@ -17748,10 +17720,8 @@ tsubst_omp_clause_decl (tree decl, tree args,
> tsubst_flags_t complain,
> if (TREE_CODE (decl) == TREE_LIST)
> {
> tree low_bound
> - = tsubst_expr (TREE_PURPOSE (decl), args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> - tree length = tsubst_expr (TREE_VALUE (decl), args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + = tsubst_expr (TREE_PURPOSE (decl), args, complain, in_decl);
> + tree length = tsubst_expr (TREE_VALUE (decl), args, complain, in_decl);
> tree chain = tsubst_omp_clause_decl (TREE_CHAIN (decl), args, complain,
> in_decl, NULL);
> if (TREE_PURPOSE (decl) == low_bound
> @@ -17763,8 +17733,7 @@ tsubst_omp_clause_decl (tree decl, tree args,
> tsubst_flags_t complain,
> = OMP_CLAUSE_DOACROSS_SINK_NEGATIVE (decl);
> return ret;
> }
> - tree ret = tsubst_expr (decl, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + tree ret = tsubst_expr (decl, args, complain, in_decl);
> /* Undo convert_from_reference tsubst_expr could have called. */
> if (decl
> && REFERENCE_REF_P (ret)
> @@ -17795,8 +17764,8 @@ tsubst_omp_clauses (tree clauses, enum
> c_omp_region_type ort,
> if (OMP_CLAUSE_LASTPRIVATE_STMT (oc))
> {
> OMP_CLAUSE_LASTPRIVATE_STMT (nc) = push_stmt_list ();
> - tsubst_expr (OMP_CLAUSE_LASTPRIVATE_STMT (oc), args, complain,
> - in_decl, /*integral_constant_expression_p=*/false);
> + tsubst_expr (OMP_CLAUSE_LASTPRIVATE_STMT (oc), args,
> + complain, in_decl);
> OMP_CLAUSE_LASTPRIVATE_STMT (nc)
> = pop_stmt_list (OMP_CLAUSE_LASTPRIVATE_STMT (nc));
> }
> @@ -17829,8 +17798,7 @@ tsubst_omp_clauses (tree clauses, enum
> c_omp_region_type ort,
> if (OMP_CLAUSE_NUM_TEAMS_LOWER_EXPR (oc))
> OMP_CLAUSE_NUM_TEAMS_LOWER_EXPR (nc)
> = tsubst_expr (OMP_CLAUSE_NUM_TEAMS_LOWER_EXPR (oc), args,
> - complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + complain, in_decl);
> /* FALLTHRU */
> case OMP_CLAUSE_TILE:
> case OMP_CLAUSE_IF:
> @@ -17858,8 +17826,7 @@ tsubst_omp_clauses (tree clauses, enum
> c_omp_region_type ort,
> case OMP_CLAUSE_WAIT:
> case OMP_CLAUSE_DETACH:
> OMP_CLAUSE_OPERAND (nc, 0)
> - = tsubst_expr (OMP_CLAUSE_OPERAND (oc, 0), args, complain,
> - in_decl, /*integral_constant_expression_p=*/false);
> + = tsubst_expr (OMP_CLAUSE_OPERAND (oc, 0), args, complain, in_decl);
> break;
> case OMP_CLAUSE_REDUCTION:
> case OMP_CLAUSE_IN_REDUCTION:
> @@ -17889,19 +17856,16 @@ tsubst_omp_clauses (tree clauses, enum
> c_omp_region_type ort,
> = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc), args, complain,
> in_decl, NULL);
> OMP_CLAUSE_OPERAND (nc, 1)
> - = tsubst_expr (OMP_CLAUSE_OPERAND (oc, 1), args, complain,
> - in_decl, /*integral_constant_expression_p=*/false);
> + = tsubst_expr (OMP_CLAUSE_OPERAND (oc, 1), args, complain, in_decl);
> break;
> case OMP_CLAUSE_ALLOCATE:
> OMP_CLAUSE_DECL (nc)
> = tsubst_omp_clause_decl (OMP_CLAUSE_DECL (oc), args, complain,
> in_decl, NULL);
> OMP_CLAUSE_OPERAND (nc, 1)
> - = tsubst_expr (OMP_CLAUSE_OPERAND (oc, 1), args, complain,
> - in_decl, /*integral_constant_expression_p=*/false);
> + = tsubst_expr (OMP_CLAUSE_OPERAND (oc, 1), args, complain, in_decl);
> OMP_CLAUSE_OPERAND (nc, 2)
> - = tsubst_expr (OMP_CLAUSE_OPERAND (oc, 2), args, complain,
> - in_decl, /*integral_constant_expression_p=*/false);
> + = tsubst_expr (OMP_CLAUSE_OPERAND (oc, 2), args, complain, in_decl);
> break;
> case OMP_CLAUSE_LINEAR:
> OMP_CLAUSE_DECL (nc)
> @@ -17918,9 +17882,8 @@ tsubst_omp_clauses (tree clauses, enum
> c_omp_region_type ort,
> complain, in_decl, NULL);
> else
> OMP_CLAUSE_LINEAR_STEP (nc)
> - = tsubst_expr (OMP_CLAUSE_LINEAR_STEP (oc), args, complain,
> - in_decl,
> - /*integral_constant_expression_p=*/false);
> + = tsubst_expr (OMP_CLAUSE_LINEAR_STEP (oc), args,
> + complain, in_decl);
> break;
> case OMP_CLAUSE_NOWAIT:
> case OMP_CLAUSE_DEFAULT:
> @@ -18045,8 +18008,7 @@ tsubst_copy_asm_operands (tree t, tree args,
> tsubst_flags_t complain,
> return t;
>
> if (TREE_CODE (t) != TREE_LIST)
> - return tsubst_copy_and_build (t, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + return tsubst_copy_and_build (t, args, complain, in_decl);
>
> if (t == void_list_node)
> return t;
> @@ -18087,12 +18049,10 @@ static tree tsubst_decomp_names (tree, tree, tree,
> tsubst_flags_t, tree,
> static bool
> tsubst_omp_for_iterator (tree t, int i, tree declv, tree &orig_declv,
> tree initv, tree condv, tree incrv, tree *clauses,
> - tree args, tsubst_flags_t complain, tree in_decl,
> - bool integral_constant_expression_p)
> + tree args, tsubst_flags_t complain, tree in_decl)
> {
> #define RECUR(NODE) \
> - tsubst_expr ((NODE), args, complain, in_decl, \
> - integral_constant_expression_p)
> + tsubst_expr ((NODE), args, complain, in_decl)
> tree decl, init, cond = NULL_TREE, incr = NULL_TREE;
> bool ret = false;
>
> @@ -18580,13 +18540,11 @@ dependent_operand_p (tree t)
> processing. */
>
> tree
> -tsubst_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl,
> - bool integral_constant_expression_p)
> +tsubst_expr (tree t, tree args, tsubst_flags_t complain, tree in_decl)
> {
> #define RETURN(EXP) do { r = (EXP); goto out; } while(0)
> #define RECUR(NODE) \
> - tsubst_expr ((NODE), args, complain, in_decl, \
> - integral_constant_expression_p)
> + tsubst_expr ((NODE), args, complain, in_decl)
>
> tree stmt, tmp;
> tree r;
> @@ -19132,11 +19090,8 @@ tsubst_expr (tree t, tree args, tsubst_flags_t
> complain, tree in_decl,
> tree condition;
>
> ++c_inhibit_evaluation_warnings;
> - condition =
> - tsubst_expr (STATIC_ASSERT_CONDITION (t),
> - args,
> - complain, in_decl,
> - /*integral_constant_expression_p=*/true);
> + condition = tsubst_expr (STATIC_ASSERT_CONDITION (t), args,
> + complain, in_decl);
> --c_inhibit_evaluation_warnings;
>
> finish_static_assert (condition,
> @@ -19232,8 +19187,7 @@ tsubst_expr (tree t, tree args, tsubst_flags_t
> complain, tree in_decl,
> any_range_for
> |= tsubst_omp_for_iterator (t, i, declv, orig_declv, initv,
> condv, incrv, &clauses, args,
> - complain, in_decl,
> - integral_constant_expression_p);
> + complain, in_decl);
> omp_parallel_combined_clauses = NULL;
>
> if (any_range_for)
> @@ -19631,8 +19585,7 @@ tsubst_expr (tree t, tree args, tsubst_flags_t
> complain, tree in_decl,
> default:
> gcc_assert (!STATEMENT_CODE_P (TREE_CODE (t)));
>
> - RETURN (tsubst_copy_and_build (t, args, complain, in_decl,
> - integral_constant_expression_p));
> + RETURN (tsubst_copy_and_build (t, args, complain, in_decl));
> }
>
> RETURN (NULL_TREE);
> @@ -19679,7 +19632,7 @@ tsubst_omp_udr (tree t, tree args, tsubst_flags_t
> complain, tree in_decl)
> DECL_CONTEXT (omp_in) = current_function_decl;
> keep_next_level (true);
> tree block = begin_omp_structured_block ();
> - tsubst_expr (stmts[2], args, complain, in_decl, false);
> + tsubst_expr (stmts[2], args, complain, in_decl);
> block = finish_omp_structured_block (block);
> block = maybe_cleanup_point_expr_void (block);
> add_decl_expr (omp_out);
> @@ -19699,7 +19652,7 @@ tsubst_omp_udr (tree t, tree args, tsubst_flags_t
> complain, tree in_decl)
> DECL_CONTEXT (omp_orig) = current_function_decl;
> keep_next_level (true);
> tree block = begin_omp_structured_block ();
> - tsubst_expr (stmts[5], args, complain, in_decl, false);
> + tsubst_expr (stmts[5], args, complain, in_decl);
> block = finish_omp_structured_block (block);
> block = maybe_cleanup_point_expr_void (block);
> cp_walk_tree (&block, cp_remove_omp_priv_cleanup_stmt, omp_priv, NULL);
> @@ -19723,8 +19676,7 @@ tsubst_non_call_postfix_expression (tree t, tree args,
> t = tsubst_qualified_id (t, args, complain, in_decl,
> /*done=*/false, /*address_p=*/false);
> else
> - t = tsubst_copy_and_build (t, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + t = tsubst_copy_and_build (t, args, complain, in_decl);
>
> return t;
> }
> @@ -19795,8 +19747,7 @@ tsubst_lambda_expr (tree t, tree args, tsubst_flags_t
> complain, tree in_decl)
> if (PACK_EXPANSION_P (init))
> init = tsubst_pack_expansion (init, args, complain, in_decl);
> else
> - init = tsubst_copy_and_build (init, args, complain, in_decl,
> - /*constexpr*/false);
> + init = tsubst_copy_and_build (init, args, complain, in_decl);
>
> if (init == error_mark_node)
> return error_mark_node;
> @@ -19962,7 +19913,7 @@ tsubst_lambda_expr (tree t, tree args, tsubst_flags_t
> complain, tree in_decl)
> need another to confuse NRV (91217). */
> saved = BIND_EXPR_BODY (saved);
>
> - tsubst_expr (saved, args, complain, r, /*constexpr*/false);
> + tsubst_expr (saved, args, complain, r);
>
> finish_lambda_function (body);
>
> @@ -20053,7 +20004,6 @@ maybe_fold_fn_template_args (tree fn, tsubst_flags_t
> complain)
> static void
> tsubst_copy_and_build_call_args (tree t, tree args, tsubst_flags_t complain,
> tree in_decl,
> - bool integral_constant_expression_p,
> releasing_vec &call_args)
> {
> unsigned int nargs = call_expr_nargs (t);
> @@ -20063,8 +20013,7 @@ tsubst_copy_and_build_call_args (tree t, tree args,
> tsubst_flags_t complain,
>
> if (!PACK_EXPANSION_P (arg))
> vec_safe_push (call_args,
> - tsubst_copy_and_build (arg, args, complain, in_decl,
> - integral_constant_expression_p));
> + tsubst_copy_and_build (arg, args, complain, in_decl));
> else
> {
> /* Expand the pack expansion and push each entry onto CALL_ARGS. */
> @@ -20093,16 +20042,11 @@ tsubst_copy_and_build_call_args (tree t, tree args,
> tsubst_flags_t complain,
> analysis. */
>
> tree
> -tsubst_copy_and_build (tree t,
> - tree args,
> - tsubst_flags_t complain,
> - tree in_decl,
> - bool integral_constant_expression_p)
> +tsubst_copy_and_build (tree t, tree args, tsubst_flags_t complain, tree
> in_decl)
> {
> #define RETURN(EXP) do { retval = (EXP); goto out; } while(0)
> #define RECUR(NODE) \
> - tsubst_copy_and_build (NODE, args, complain, in_decl, \
> - integral_constant_expression_p)
> + tsubst_copy_and_build (NODE, args, complain, in_decl)
>
> tree retval, op1;
> location_t save_loc;
> @@ -20128,7 +20072,6 @@ tsubst_copy_and_build (tree t,
> {
> tree decl;
> cp_id_kind idk;
> - bool non_integral_constant_expression_p;
> const char *error_msg;
>
> if (IDENTIFIER_CONV_OP_P (t))
> @@ -20147,9 +20090,9 @@ tsubst_copy_and_build (tree t,
>
> decl = finish_id_expression (t, decl, NULL_TREE,
> &idk,
> - integral_constant_expression_p,
> - /*allow_non_integral_constant_expression_p=*/(cxx_dialect >=
> cxx11),
> - &non_integral_constant_expression_p,
> + /*i_c_e_p=*/false,
> + /*allow_i_c_e_p=*/true,
> + /*non_i_c_e_p=*/nullptr,
> /*template_p=*/false,
> /*done=*/true,
> /*address_p=*/false,
> @@ -20171,8 +20114,7 @@ tsubst_copy_and_build (tree t,
> {
> tree object;
> tree templ = tsubst_copy_and_build (TREE_OPERAND (t, 0), args,
> - complain, in_decl,
> - integral_constant_expression_p);
> + complain, in_decl);
> tree targs = TREE_OPERAND (t, 1);
>
> if (targs)
> @@ -20312,14 +20254,6 @@ tsubst_copy_and_build (tree t,
> if (TREE_CODE (t) == CAST_EXPR)
> tcomplain |= tf_tst_ok;
> type = tsubst (TREE_TYPE (t), args, tcomplain, in_decl);
> - if (integral_constant_expression_p
> - && !cast_valid_in_integral_constant_expression_p (type))
> - {
> - if (complain & tf_error)
> - error ("a cast to a type other than an integral or "
> - "enumeration type cannot appear in a
> constant-expression");
> - RETURN (error_mark_node);
> - }
>
> op = RECUR (TREE_OPERAND (t, 0));
>
> @@ -20504,7 +20438,6 @@ tsubst_copy_and_build (tree t,
> tree c = TREE_OPERAND (t, 1);
> releasing_vec index_exp_list;
> tsubst_copy_and_build_call_args (c, args, complain, in_decl,
> - integral_constant_expression_p,
> index_exp_list);
>
> tree r;
> @@ -20553,9 +20486,7 @@ tsubst_copy_and_build (tree t,
> if (TYPE_P (op1))
> op1 = tsubst (op1, args, complain, in_decl);
> else
> - op1 = tsubst_copy_and_build (op1, args, complain, in_decl,
> - /*integral_constant_expression_p=*/
> - false);
> + op1 = tsubst_copy_and_build (op1, args, complain, in_decl);
> --cp_unevaluated_operand;
> --c_inhibit_evaluation_warnings;
> }
> @@ -20592,8 +20523,7 @@ tsubst_copy_and_build (tree t,
> op1 = TREE_OPERAND (t, 0);
> ++cp_unevaluated_operand;
> ++c_inhibit_evaluation_warnings;
> - op1 = tsubst_copy_and_build (op1, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + op1 = tsubst_copy_and_build (op1, args, complain, in_decl);
> --cp_unevaluated_operand;
> --c_inhibit_evaluation_warnings;
> RETURN (objc_build_encode_expr (op1));
> @@ -20604,8 +20534,7 @@ tsubst_copy_and_build (tree t,
> ++cp_unevaluated_operand;
> ++c_inhibit_evaluation_warnings;
> ++cp_noexcept_operand;
> - op1 = tsubst_copy_and_build (op1, args, complain, in_decl,
> - /*integral_constant_expression_p=*/false);
> + op1 = tsubst_copy_and_build (op1, args, complain, in_decl);
> --cp_unevaluated_operand;
> --c_inhibit_evaluation_warnings;
> --cp_noexcept_operand;
> @@ -20714,8 +20643,7 @@ tsubst_copy_and_build (tree t,
> case COMPOUND_EXPR:
> {
> tree op0 = tsubst_copy_and_build (TREE_OPERAND (t, 0), args,
> - complain & ~tf_decltype, in_decl,
> - integral_constant_expression_p);
> + complain & ~tf_decltype, in_decl);
> RETURN (build_x_compound_expr (EXPR_LOCATION (t),
> op0,
> RECUR (TREE_OPERAND (t, 1)),
> @@ -20796,9 +20724,7 @@ tsubst_copy_and_build (tree t,
> augmenting the overload set via ADL, so during this initial
> substitution we disable mark_used by setting tf_conv (68942).
> */
> subcomplain |= tf_conv;
> - function = tsubst_copy_and_build (function, args, subcomplain,
> - in_decl,
> - integral_constant_expression_p);
> + function = tsubst_copy_and_build (function, args, subcomplain,
> in_decl);
>
> if (BASELINK_P (function))
> qualified_p = true;
> @@ -20807,7 +20733,6 @@ tsubst_copy_and_build (tree t,
> nargs = call_expr_nargs (t);
> releasing_vec call_args;
> tsubst_copy_and_build_call_args (t, args, complain, in_decl,
> - integral_constant_expression_p,
> call_args);
>
> /* Stripped-down processing for a call in a thunk. Specifically, in
> @@ -20900,9 +20825,8 @@ tsubst_copy_and_build (tree t,
> /* For backwards compatibility and good diagnostics, try
> the unqualified lookup again if we aren't in SFINAE
> context. */
> - tree unq = (tsubst_copy_and_build
> - (function, args, complain, in_decl,
> - integral_constant_expression_p));
> + tree unq = tsubst_copy_and_build (function, args,
> + complain, in_decl);
> if (unq == error_mark_node)
> RETURN (error_mark_node);
>
> @@ -21450,9 +21374,8 @@ tsubst_copy_and_build (tree t,
> case OFFSETOF_EXPR:
> {
> tree object_ptr
> - = tsubst_copy_and_build (TREE_OPERAND (t, 1), args, complain,
> - in_decl,
> - /*integral_constant_expression_p=*/false);
> + = tsubst_copy_and_build (TREE_OPERAND (t, 1), args,
> + complain, in_decl);
> RETURN (finish_offsetof (object_ptr,
> RECUR (TREE_OPERAND (t, 0)),
> EXPR_LOCATION (t)));
> @@ -21478,8 +21401,7 @@ tsubst_copy_and_build (tree t,
> tree stmt_expr = begin_stmt_expr ();
>
> cur_stmt_expr = stmt_expr;
> - tsubst_expr (STMT_EXPR_STMT (t), args, complain, in_decl,
> - integral_constant_expression_p);
> + tsubst_expr (STMT_EXPR_STMT (t), args, complain, in_decl);
> stmt_expr = finish_stmt_expr (stmt_expr, false);
> cur_stmt_expr = old_stmt_expr;
>
> @@ -21506,8 +21428,7 @@ tsubst_copy_and_build (tree t,
> }
>
> case TRANSACTION_EXPR:
> - RETURN (tsubst_expr(t, args, complain, in_decl,
> - integral_constant_expression_p));
> + RETURN (tsubst_expr (t, args, complain, in_decl));
>
> case PAREN_EXPR:
> if (REF_PARENTHESIZED_P (t))
> @@ -26369,8 +26290,7 @@ maybe_instantiate_noexcept (tree fn, tsubst_flags_t
> complain)
> /* Do deferred instantiation of the noexcept-specifier. */
> noex = tsubst_copy_and_build (DEFERRED_NOEXCEPT_PATTERN (noex),
> DEFERRED_NOEXCEPT_ARGS (noex),
> - tf_warning_or_error, fn,
> - /*i_c_e_p=*/true);
> + tf_warning_or_error, fn);
>
> /* Build up the noexcept-specification. */
> spec = build_noexcept_spec (noex, tf_warning_or_error);
> @@ -26556,8 +26476,7 @@ instantiate_body (tree pattern, tree args, tree d,
> bool nested_p)
> else
> {
> tsubst_expr (DECL_SAVED_TREE (code_pattern), args,
> - tf_warning_or_error, DECL_TI_TEMPLATE (d),
> - /*integral_constant_expression_p=*/false);
> + tf_warning_or_error, DECL_TI_TEMPLATE (d));
>
> /* Set the current input_location to the end of the function
> so that finish_function knows where we are. */
> @@ -26798,8 +26717,7 @@ instantiate_decl (tree d, bool defer_ok, bool
> expl_inst_class_mem_p)
> push_nested_class (DECL_CONTEXT (d));
> init = tsubst_expr (DECL_INITIAL (code_pattern),
> args,
> - tf_warning_or_error, NULL_TREE,
> - /*integral_constant_expression_p=*/false);
> + tf_warning_or_error, NULL_TREE);
> /* If instantiating the initializer involved instantiating this
> again, don't call cp_finish_decl twice. */
> if (!DECL_INITIAL (d))
> @@ -27087,8 +27005,7 @@ tsubst_initializer_list (tree t, tree argvec)
> tmp = init;
> if (init != void_type_node)
> init = tsubst_expr (init, argvec,
> - tf_warning_or_error, NULL_TREE,
> - /*integral_constant_expression_p=*/false);
> + tf_warning_or_error, NULL_TREE);
> if (init == NULL_TREE && tmp != NULL_TREE)
> /* If we had an initializer but it instantiated to nothing,
> value-initialize the object. This will only occur when
> @@ -27154,8 +27071,7 @@ tsubst_enum (tree tag, tree newtag, tree args)
> /* Note that in a template enum, the TREE_VALUE is the
> CONST_DECL, not the corresponding INTEGER_CST. */
> value = tsubst_expr (DECL_INITIAL (decl),
> - args, tf_warning_or_error, NULL_TREE,
> - /*integral_constant_expression_p=*/true);
> + args, tf_warning_or_error, NULL_TREE);
>
> /* Give this enumeration constant the correct access. */
> set_current_access_from_decl (decl);
> diff --git a/gcc/objcp/objcp-lang.cc b/gcc/objcp/objcp-lang.cc
> index 5f0e22942b8..fa754028773 100644
> --- a/gcc/objcp/objcp-lang.cc
> +++ b/gcc/objcp/objcp-lang.cc
> @@ -54,8 +54,7 @@ objcp_tsubst_copy_and_build (tree t, tree args,
> tsubst_flags_t complain,
> tree in_decl)
> {
> #define RECURSE(NODE)
> \
> - tsubst_copy_and_build (NODE, args, complain, in_decl, \
> - /*integral_constant_expression_p=*/false)
> + tsubst_copy_and_build (NODE, args, complain, in_decl)
>
> /* The following two can only occur in Objective-C++. */
>
> diff --git a/gcc/testsuite/g++.dg/template/crash55.C
> b/gcc/testsuite/g++.dg/template/crash55.C
> index 5416e32cacb..8a7fc112c19 100644
> --- a/gcc/testsuite/g++.dg/template/crash55.C
> +++ b/gcc/testsuite/g++.dg/template/crash55.C
> @@ -1,7 +1,6 @@
> //PR c++/27668
>
> template<typename class T, T = T()> // { dg-error "nested-name-specifier|two
> or more|class type|incomplete" }
> -// { dg-error "cast" "" { target c++98_only } .-1 }
> struct A {};
>
> -template<int> void foo(A<int>); // { dg-error "template argument 2" ""
> { target c++98_only } }
> +template<int> void foo(A<int>);
> diff --git a/gcc/testsuite/g++.dg/template/ref3.C
> b/gcc/testsuite/g++.dg/template/ref3.C
> index 91e3c93a35d..976c093a15b 100644
> --- a/gcc/testsuite/g++.dg/template/ref3.C
> +++ b/gcc/testsuite/g++.dg/template/ref3.C
> @@ -5,8 +5,7 @@ template<const int&> struct A {};
> template<typename T> struct B
> {
> A<(T)0> b; // { dg-error "constant|not a valid" }
> - A<T(0)> a; // { dg-error "constant|not a valid" "" { xfail c++98_only } }
> - // PR c++/68699
> + A<T(0)> a; // { dg-error "constant|not a valid" }
> };
>
> B<const int&> b;
> --
> 2.38.1.420.g319605f8f0
>
>
