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Auto merge of #115712 - RalfJung:wf, r=compiler-errors
rustc_layout, rustc_abi: make sure the types are well-formed Fixes https://github.com/rust-lang/rust/issues/115676
This commit is contained in:
commit
0d0ad42e27
@ -1,12 +1,13 @@
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use rustc_ast::Attribute;
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use rustc_hir::def::DefKind;
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use rustc_hir::def_id::DefId;
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use rustc_hir::def_id::LocalDefId;
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use rustc_middle::ty::layout::{FnAbiError, LayoutError};
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use rustc_middle::ty::{self, GenericArgs, Instance, Ty, TyCtxt};
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use rustc_span::source_map::Spanned;
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use rustc_span::symbol::sym;
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use rustc_target::abi::call::FnAbi;
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use super::layout_test::ensure_wf;
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use crate::errors::{AbiInvalidAttribute, AbiNe, AbiOf, UnrecognizedField};
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pub fn test_abi(tcx: TyCtxt<'_>) {
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@ -14,32 +15,17 @@ pub fn test_abi(tcx: TyCtxt<'_>) {
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// if the `rustc_attrs` feature is not enabled, don't bother testing ABI
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return;
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}
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for id in tcx.hir().items() {
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for attr in tcx.get_attrs(id.owner_id, sym::rustc_abi) {
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match tcx.def_kind(id.owner_id) {
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DefKind::Fn => {
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dump_abi_of_fn_item(tcx, id.owner_id.def_id.into(), attr);
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for id in tcx.hir_crate_items(()).definitions() {
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for attr in tcx.get_attrs(id, sym::rustc_abi) {
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match tcx.def_kind(id) {
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DefKind::Fn | DefKind::AssocFn => {
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dump_abi_of_fn_item(tcx, id, attr);
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}
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DefKind::TyAlias { .. } => {
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dump_abi_of_fn_type(tcx, id.owner_id.def_id.into(), attr);
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dump_abi_of_fn_type(tcx, id, attr);
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}
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_ => {
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tcx.sess.emit_err(AbiInvalidAttribute { span: tcx.def_span(id.owner_id) });
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}
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}
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}
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if matches!(tcx.def_kind(id.owner_id), DefKind::Impl { .. }) {
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// To find associated functions we need to go into the child items here.
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for &id in tcx.associated_item_def_ids(id.owner_id) {
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for attr in tcx.get_attrs(id, sym::rustc_abi) {
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match tcx.def_kind(id) {
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DefKind::AssocFn => {
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dump_abi_of_fn_item(tcx, id, attr);
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}
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_ => {
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tcx.sess.emit_err(AbiInvalidAttribute { span: tcx.def_span(id) });
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}
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}
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tcx.sess.emit_err(AbiInvalidAttribute { span: tcx.def_span(id) });
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}
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}
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}
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@ -49,7 +35,7 @@ pub fn test_abi(tcx: TyCtxt<'_>) {
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fn unwrap_fn_abi<'tcx>(
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abi: Result<&'tcx FnAbi<'tcx, Ty<'tcx>>, &'tcx FnAbiError<'tcx>>,
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tcx: TyCtxt<'tcx>,
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item_def_id: DefId,
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item_def_id: LocalDefId,
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) -> &'tcx FnAbi<'tcx, Ty<'tcx>> {
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match abi {
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Ok(abi) => abi,
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@ -71,10 +57,10 @@ fn unwrap_fn_abi<'tcx>(
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}
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}
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fn dump_abi_of_fn_item(tcx: TyCtxt<'_>, item_def_id: DefId, attr: &Attribute) {
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fn dump_abi_of_fn_item(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribute) {
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let param_env = tcx.param_env(item_def_id);
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let args = GenericArgs::identity_for_item(tcx, item_def_id);
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let instance = match Instance::resolve(tcx, param_env, item_def_id, args) {
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let instance = match Instance::resolve(tcx, param_env, item_def_id.into(), args) {
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Ok(Some(instance)) => instance,
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Ok(None) => {
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// Not sure what to do here, but `LayoutError::Unknown` seems reasonable?
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@ -99,7 +85,7 @@ fn dump_abi_of_fn_item(tcx: TyCtxt<'_>, item_def_id: DefId, attr: &Attribute) {
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for meta_item in meta_items {
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match meta_item.name_or_empty() {
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sym::debug => {
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let fn_name = tcx.item_name(item_def_id);
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let fn_name = tcx.item_name(item_def_id.into());
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tcx.sess.emit_err(AbiOf {
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span: tcx.def_span(item_def_id),
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fn_name,
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@ -128,9 +114,13 @@ fn test_abi_eq<'tcx>(abi1: &'tcx FnAbi<'tcx, Ty<'tcx>>, abi2: &'tcx FnAbi<'tcx,
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&& abi1.args.iter().zip(abi2.args.iter()).all(|(arg1, arg2)| arg1.eq_abi(arg2))
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}
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fn dump_abi_of_fn_type(tcx: TyCtxt<'_>, item_def_id: DefId, attr: &Attribute) {
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fn dump_abi_of_fn_type(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribute) {
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let param_env = tcx.param_env(item_def_id);
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let ty = tcx.type_of(item_def_id).instantiate_identity();
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let span = tcx.def_span(item_def_id);
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if !ensure_wf(tcx, param_env, ty, item_def_id, span) {
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return;
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}
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let meta_items = attr.meta_item_list().unwrap_or_default();
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for meta_item in meta_items {
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match meta_item.name_or_empty() {
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@ -147,12 +137,8 @@ fn dump_abi_of_fn_type(tcx: TyCtxt<'_>, item_def_id: DefId, attr: &Attribute) {
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item_def_id,
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);
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let fn_name = tcx.item_name(item_def_id);
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tcx.sess.emit_err(AbiOf {
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span: tcx.def_span(item_def_id),
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fn_name,
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fn_abi: format!("{:#?}", abi),
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});
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let fn_name = tcx.item_name(item_def_id.into());
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tcx.sess.emit_err(AbiOf { span, fn_name, fn_abi: format!("{:#?}", abi) });
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}
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sym::assert_eq => {
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let ty::Tuple(fields) = ty.kind() else {
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@ -196,7 +182,7 @@ fn dump_abi_of_fn_type(tcx: TyCtxt<'_>, item_def_id: DefId, attr: &Attribute) {
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if !test_abi_eq(abi1, abi2) {
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tcx.sess.emit_err(AbiNe {
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span: tcx.def_span(item_def_id),
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span,
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left: format!("{:#?}", abi1),
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right: format!("{:#?}", abi2),
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});
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@ -2,11 +2,13 @@ use rustc_ast::Attribute;
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use rustc_hir::def::DefKind;
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use rustc_hir::def_id::LocalDefId;
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use rustc_middle::ty::layout::{HasParamEnv, HasTyCtxt, LayoutError, LayoutOfHelpers, TyAndLayout};
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use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
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use rustc_middle::ty::{self, ParamEnv, Ty, TyCtxt};
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use rustc_span::source_map::Spanned;
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use rustc_span::symbol::sym;
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use rustc_span::Span;
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use rustc_target::abi::{HasDataLayout, TargetDataLayout};
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use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt;
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use rustc_trait_selection::{infer::TyCtxtInferExt, traits};
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use crate::errors::{
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LayoutAbi, LayoutAlign, LayoutHomogeneousAggregate, LayoutInvalidAttribute, LayoutOf,
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@ -18,21 +20,13 @@ pub fn test_layout(tcx: TyCtxt<'_>) {
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// if the `rustc_attrs` feature is not enabled, don't bother testing layout
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return;
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}
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for id in tcx.hir().items() {
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for attr in tcx.get_attrs(id.owner_id, sym::rustc_layout) {
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match tcx.def_kind(id.owner_id) {
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for id in tcx.hir_crate_items(()).definitions() {
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for attr in tcx.get_attrs(id, sym::rustc_layout) {
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match tcx.def_kind(id) {
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DefKind::TyAlias { .. } | DefKind::Enum | DefKind::Struct | DefKind::Union => {
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dump_layout_of(tcx, id.owner_id.def_id, attr);
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dump_layout_of(tcx, id, attr);
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}
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_ => {
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tcx.sess.emit_err(LayoutInvalidAttribute { span: tcx.def_span(id.owner_id) });
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}
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}
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}
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if matches!(tcx.def_kind(id.owner_id), DefKind::Impl { .. }) {
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// To find associated functions we need to go into the child items here.
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for &id in tcx.associated_item_def_ids(id.owner_id) {
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for _attr in tcx.get_attrs(id, sym::rustc_layout) {
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tcx.sess.emit_err(LayoutInvalidAttribute { span: tcx.def_span(id) });
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}
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}
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@ -40,9 +34,44 @@ pub fn test_layout(tcx: TyCtxt<'_>) {
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}
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}
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pub fn ensure_wf<'tcx>(
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tcx: TyCtxt<'tcx>,
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param_env: ParamEnv<'tcx>,
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ty: Ty<'tcx>,
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def_id: LocalDefId,
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span: Span,
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) -> bool {
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let pred = ty::ClauseKind::WellFormed(ty.into());
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let obligation = traits::Obligation::new(
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tcx,
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traits::ObligationCause::new(
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span,
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def_id,
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traits::ObligationCauseCode::WellFormed(Some(traits::WellFormedLoc::Ty(def_id))),
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),
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param_env,
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pred,
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);
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let infcx = tcx.infer_ctxt().build();
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let ocx = traits::ObligationCtxt::new(&infcx);
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ocx.register_obligation(obligation);
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let errors = ocx.select_all_or_error();
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if !errors.is_empty() {
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infcx.err_ctxt().report_fulfillment_errors(&errors);
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false
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} else {
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// looks WF!
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true
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}
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}
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fn dump_layout_of(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribute) {
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let param_env = tcx.param_env(item_def_id);
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let ty = tcx.type_of(item_def_id).instantiate_identity();
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let span = tcx.def_span(item_def_id.to_def_id());
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if !ensure_wf(tcx, param_env, ty, item_def_id, span) {
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return;
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}
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match tcx.layout_of(param_env.and(ty)) {
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Ok(ty_layout) => {
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// Check out the `#[rustc_layout(..)]` attribute to tell what to dump.
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@ -51,29 +80,24 @@ fn dump_layout_of(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribute) {
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for meta_item in meta_items {
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match meta_item.name_or_empty() {
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sym::abi => {
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tcx.sess.emit_err(LayoutAbi {
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span: tcx.def_span(item_def_id.to_def_id()),
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abi: format!("{:?}", ty_layout.abi),
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});
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tcx.sess.emit_err(LayoutAbi { span, abi: format!("{:?}", ty_layout.abi) });
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}
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sym::align => {
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tcx.sess.emit_err(LayoutAlign {
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span: tcx.def_span(item_def_id.to_def_id()),
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span,
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align: format!("{:?}", ty_layout.align),
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});
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}
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sym::size => {
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tcx.sess.emit_err(LayoutSize {
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span: tcx.def_span(item_def_id.to_def_id()),
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size: format!("{:?}", ty_layout.size),
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});
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tcx.sess
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.emit_err(LayoutSize { span, size: format!("{:?}", ty_layout.size) });
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}
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sym::homogeneous_aggregate => {
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tcx.sess.emit_err(LayoutHomogeneousAggregate {
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span: tcx.def_span(item_def_id.to_def_id()),
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span,
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homogeneous_aggregate: format!(
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"{:?}",
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ty_layout.homogeneous_aggregate(&UnwrapLayoutCx { tcx, param_env })
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@ -90,11 +114,7 @@ fn dump_layout_of(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribute) {
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)
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);
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let ty_layout = format!("{:#?}", *ty_layout);
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tcx.sess.emit_err(LayoutOf {
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span: tcx.def_span(item_def_id.to_def_id()),
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normalized_ty,
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ty_layout,
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});
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tcx.sess.emit_err(LayoutOf { span, normalized_ty, ty_layout });
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}
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name => {
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@ -105,11 +125,7 @@ fn dump_layout_of(tcx: TyCtxt<'_>, item_def_id: LocalDefId, attr: &Attribute) {
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}
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Err(layout_error) => {
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tcx.sess.emit_fatal(Spanned {
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node: layout_error.into_diagnostic(),
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span: tcx.def_span(item_def_id.to_def_id()),
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});
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tcx.sess.emit_fatal(Spanned { node: layout_error.into_diagnostic(), span });
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}
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}
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}
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|
@ -2,6 +2,7 @@
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#![feature(rustc_attrs, transparent_unions)]
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#![allow(unused, improper_ctypes_definitions)]
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use std::marker::PhantomData;
|
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use std::mem::ManuallyDrop;
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use std::num::NonZeroI32;
|
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use std::ptr::NonNull;
|
||||
|
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@ -37,9 +38,9 @@ enum ReprCEnum<T> {
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Variant2(T),
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}
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#[repr(C)]
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union ReprCUnion<T: Copy> {
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union ReprCUnion<T> {
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nothing: (),
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something: T,
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something: ManuallyDrop<T>,
|
||||
}
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|
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macro_rules! test_abi_compatible {
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@ -82,9 +83,9 @@ struct Wrapper2<T>((), Zst, T);
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#[repr(transparent)]
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struct Wrapper3<T>(T, [u8; 0], PhantomData<u64>);
|
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#[repr(transparent)]
|
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union WrapperUnion<T: Copy> {
|
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union WrapperUnion<T> {
|
||||
nothing: (),
|
||||
something: T,
|
||||
something: ManuallyDrop<T>,
|
||||
}
|
||||
|
||||
macro_rules! test_transparent {
|
||||
|
@ -48,3 +48,6 @@ type TestAbiNeFloat = (fn(f32), fn(u32)); //~ ERROR: ABIs are not compatible
|
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// Sign matters on some targets (such as s390x), so let's make sure we never accept this.
|
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#[rustc_abi(assert_eq)]
|
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type TestAbiNeSign = (fn(i32), fn(u32)); //~ ERROR: ABIs are not compatible
|
||||
|
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#[rustc_abi(assert_eq)]
|
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type TestAbiEqNonsense = (fn((str, str)), fn((str, str))); //~ ERROR: cannot be known at compilation time
|
||||
|
@ -268,100 +268,6 @@ error: `#[rustc_abi]` can only be applied to function items, type aliases, and a
|
||||
LL | const C: () = ();
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: `#[rustc_abi]` can only be applied to function items, type aliases, and associated functions
|
||||
--> $DIR/debug.rs:28:5
|
||||
|
|
||||
LL | const C: () = ();
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: fn_abi_of(assoc_test) = FnAbi {
|
||||
args: [
|
||||
ArgAbi {
|
||||
layout: TyAndLayout {
|
||||
ty: &S,
|
||||
layout: Layout {
|
||||
size: $SOME_SIZE,
|
||||
align: AbiAndPrefAlign {
|
||||
abi: $SOME_ALIGN,
|
||||
pref: $SOME_ALIGN,
|
||||
},
|
||||
abi: Scalar(
|
||||
Initialized {
|
||||
value: Pointer(
|
||||
AddressSpace(
|
||||
0,
|
||||
),
|
||||
),
|
||||
valid_range: $NON_NULL,
|
||||
},
|
||||
),
|
||||
fields: Primitive,
|
||||
largest_niche: Some(
|
||||
Niche {
|
||||
offset: Size(0 bytes),
|
||||
value: Pointer(
|
||||
AddressSpace(
|
||||
0,
|
||||
),
|
||||
),
|
||||
valid_range: $NON_NULL,
|
||||
},
|
||||
),
|
||||
variants: Single {
|
||||
index: 0,
|
||||
},
|
||||
max_repr_align: None,
|
||||
unadjusted_abi_align: $SOME_ALIGN,
|
||||
},
|
||||
},
|
||||
mode: Direct(
|
||||
ArgAttributes {
|
||||
regular: NoAlias | NonNull | ReadOnly | NoUndef,
|
||||
arg_ext: None,
|
||||
pointee_size: Size(2 bytes),
|
||||
pointee_align: Some(
|
||||
Align(2 bytes),
|
||||
),
|
||||
},
|
||||
),
|
||||
},
|
||||
],
|
||||
ret: ArgAbi {
|
||||
layout: TyAndLayout {
|
||||
ty: (),
|
||||
layout: Layout {
|
||||
size: Size(0 bytes),
|
||||
align: AbiAndPrefAlign {
|
||||
abi: $SOME_ALIGN,
|
||||
pref: $SOME_ALIGN,
|
||||
},
|
||||
abi: Aggregate {
|
||||
sized: true,
|
||||
},
|
||||
fields: Arbitrary {
|
||||
offsets: [],
|
||||
memory_index: [],
|
||||
},
|
||||
largest_niche: None,
|
||||
variants: Single {
|
||||
index: 0,
|
||||
},
|
||||
max_repr_align: None,
|
||||
unadjusted_abi_align: $SOME_ALIGN,
|
||||
},
|
||||
},
|
||||
mode: Ignore,
|
||||
},
|
||||
c_variadic: false,
|
||||
fixed_count: 1,
|
||||
conv: Rust,
|
||||
can_unwind: $SOME_BOOL,
|
||||
}
|
||||
--> $DIR/debug.rs:33:5
|
||||
|
|
||||
LL | fn assoc_test(&self) { }
|
||||
| ^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: ABIs are not compatible
|
||||
left ABI = FnAbi {
|
||||
args: [
|
||||
@ -945,5 +851,109 @@ error: ABIs are not compatible
|
||||
LL | type TestAbiNeSign = (fn(i32), fn(u32));
|
||||
| ^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: aborting due to 10 previous errors
|
||||
error[E0277]: the size for values of type `str` cannot be known at compilation time
|
||||
--> $DIR/debug.rs:53:46
|
||||
|
|
||||
LL | type TestAbiEqNonsense = (fn((str, str)), fn((str, str)));
|
||||
| ^^^^^^^^^^ doesn't have a size known at compile-time
|
||||
|
|
||||
= help: the trait `Sized` is not implemented for `str`
|
||||
= note: only the last element of a tuple may have a dynamically sized type
|
||||
|
||||
error: `#[rustc_abi]` can only be applied to function items, type aliases, and associated functions
|
||||
--> $DIR/debug.rs:28:5
|
||||
|
|
||||
LL | const C: () = ();
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: fn_abi_of(assoc_test) = FnAbi {
|
||||
args: [
|
||||
ArgAbi {
|
||||
layout: TyAndLayout {
|
||||
ty: &S,
|
||||
layout: Layout {
|
||||
size: $SOME_SIZE,
|
||||
align: AbiAndPrefAlign {
|
||||
abi: $SOME_ALIGN,
|
||||
pref: $SOME_ALIGN,
|
||||
},
|
||||
abi: Scalar(
|
||||
Initialized {
|
||||
value: Pointer(
|
||||
AddressSpace(
|
||||
0,
|
||||
),
|
||||
),
|
||||
valid_range: $NON_NULL,
|
||||
},
|
||||
),
|
||||
fields: Primitive,
|
||||
largest_niche: Some(
|
||||
Niche {
|
||||
offset: Size(0 bytes),
|
||||
value: Pointer(
|
||||
AddressSpace(
|
||||
0,
|
||||
),
|
||||
),
|
||||
valid_range: $NON_NULL,
|
||||
},
|
||||
),
|
||||
variants: Single {
|
||||
index: 0,
|
||||
},
|
||||
max_repr_align: None,
|
||||
unadjusted_abi_align: $SOME_ALIGN,
|
||||
},
|
||||
},
|
||||
mode: Direct(
|
||||
ArgAttributes {
|
||||
regular: NoAlias | NonNull | ReadOnly | NoUndef,
|
||||
arg_ext: None,
|
||||
pointee_size: Size(2 bytes),
|
||||
pointee_align: Some(
|
||||
Align(2 bytes),
|
||||
),
|
||||
},
|
||||
),
|
||||
},
|
||||
],
|
||||
ret: ArgAbi {
|
||||
layout: TyAndLayout {
|
||||
ty: (),
|
||||
layout: Layout {
|
||||
size: Size(0 bytes),
|
||||
align: AbiAndPrefAlign {
|
||||
abi: $SOME_ALIGN,
|
||||
pref: $SOME_ALIGN,
|
||||
},
|
||||
abi: Aggregate {
|
||||
sized: true,
|
||||
},
|
||||
fields: Arbitrary {
|
||||
offsets: [],
|
||||
memory_index: [],
|
||||
},
|
||||
largest_niche: None,
|
||||
variants: Single {
|
||||
index: 0,
|
||||
},
|
||||
max_repr_align: None,
|
||||
unadjusted_abi_align: $SOME_ALIGN,
|
||||
},
|
||||
},
|
||||
mode: Ignore,
|
||||
},
|
||||
c_variadic: false,
|
||||
fixed_count: 1,
|
||||
conv: Rust,
|
||||
can_unwind: $SOME_BOOL,
|
||||
}
|
||||
--> $DIR/debug.rs:33:5
|
||||
|
|
||||
LL | fn assoc_test(&self) { }
|
||||
| ^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: aborting due to 11 previous errors
|
||||
|
||||
For more information about this error, try `rustc --explain E0277`.
|
||||
|
9
tests/ui/associated-types/issue-85103-layout-debug.rs
Normal file
9
tests/ui/associated-types/issue-85103-layout-debug.rs
Normal file
@ -0,0 +1,9 @@
|
||||
#![feature(rustc_attrs)]
|
||||
|
||||
use std::borrow::Cow;
|
||||
|
||||
#[rustc_layout(debug)]
|
||||
type Edges<'a, E> = Cow<'a, [E]>;
|
||||
//~^ the trait bound `[E]: ToOwned` is not satisfied
|
||||
|
||||
fn main() {}
|
16
tests/ui/associated-types/issue-85103-layout-debug.stderr
Normal file
16
tests/ui/associated-types/issue-85103-layout-debug.stderr
Normal file
@ -0,0 +1,16 @@
|
||||
error[E0277]: the trait bound `[E]: ToOwned` is not satisfied
|
||||
--> $DIR/issue-85103-layout-debug.rs:6:21
|
||||
|
|
||||
LL | type Edges<'a, E> = Cow<'a, [E]>;
|
||||
| ^^^^^^^^^^^^ the trait `ToOwned` is not implemented for `[E]`
|
||||
|
|
||||
note: required by a bound in `Cow`
|
||||
--> $SRC_DIR/alloc/src/borrow.rs:LL:COL
|
||||
help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
|
||||
|
|
||||
LL | type Edges<'a, E> where [E]: ToOwned = Cow<'a, [E]>;
|
||||
| ++++++++++++++++++
|
||||
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0277`.
|
@ -1,9 +0,0 @@
|
||||
#![feature(rustc_attrs)]
|
||||
|
||||
use std::borrow::Cow;
|
||||
|
||||
#[rustc_layout(debug)]
|
||||
type Edges<'a, E> = Cow<'a, [E]>;
|
||||
//~^ 6:1: 6:18: unable to determine layout for `<[E] as ToOwned>::Owned` because `<[E] as ToOwned>::Owned` cannot be normalized
|
||||
|
||||
fn main() {}
|
@ -1,8 +0,0 @@
|
||||
error: unable to determine layout for `<[E] as ToOwned>::Owned` because `<[E] as ToOwned>::Owned` cannot be normalized
|
||||
--> $DIR/issue-85103.rs:6:1
|
||||
|
|
||||
LL | type Edges<'a, E> = Cow<'a, [E]>;
|
||||
| ^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: aborting due to previous error
|
||||
|
@ -73,3 +73,6 @@ impl S {
|
||||
#[rustc_layout(debug)]
|
||||
const C: () = (); //~ ERROR: can only be applied to
|
||||
}
|
||||
|
||||
#[rustc_layout(debug)]
|
||||
type Impossible = (str, str); //~ ERROR: cannot be known at compilation time
|
||||
|
@ -557,11 +557,21 @@ error: `#[rustc_layout]` can only be applied to `struct`/`enum`/`union` declarat
|
||||
LL | const C: () = ();
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error[E0277]: the size for values of type `str` cannot be known at compilation time
|
||||
--> $DIR/debug.rs:78:19
|
||||
|
|
||||
LL | type Impossible = (str, str);
|
||||
| ^^^^^^^^^^ doesn't have a size known at compile-time
|
||||
|
|
||||
= help: the trait `Sized` is not implemented for `str`
|
||||
= note: only the last element of a tuple may have a dynamically sized type
|
||||
|
||||
error: `#[rustc_layout]` can only be applied to `struct`/`enum`/`union` declarations and type aliases
|
||||
--> $DIR/debug.rs:74:5
|
||||
|
|
||||
LL | const C: () = ();
|
||||
| ^^^^^^^^^^^
|
||||
|
||||
error: aborting due to 16 previous errors
|
||||
error: aborting due to 17 previous errors
|
||||
|
||||
For more information about this error, try `rustc --explain E0277`.
|
||||
|
Loading…
Reference in New Issue
Block a user