689 lines
26 KiB
Rust
689 lines
26 KiB
Rust
use rustc_ast as ast;
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use rustc_ast::visit::{self, AssocCtxt, FnCtxt, FnKind, Visitor};
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use rustc_ast::{NodeId, PatKind, attr, token};
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use rustc_feature::{AttributeGate, BUILTIN_ATTRIBUTE_MAP, BuiltinAttribute, Features, GateIssue};
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use rustc_session::Session;
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use rustc_session::parse::{feature_err, feature_err_issue, feature_warn};
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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, Symbol};
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use rustc_target::spec::abi;
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use thin_vec::ThinVec;
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use crate::errors;
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/// The common case.
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macro_rules! gate {
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($visitor:expr, $feature:ident, $span:expr, $explain:expr) => {{
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if !$visitor.features.$feature() && !$span.allows_unstable(sym::$feature) {
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#[allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable
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feature_err(&$visitor.sess, sym::$feature, $span, $explain).emit();
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}
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}};
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($visitor:expr, $feature:ident, $span:expr, $explain:expr, $help:expr) => {{
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if !$visitor.features.$feature() && !$span.allows_unstable(sym::$feature) {
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// FIXME: make this translatable
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#[allow(rustc::diagnostic_outside_of_impl)]
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#[allow(rustc::untranslatable_diagnostic)]
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feature_err(&$visitor.sess, sym::$feature, $span, $explain).with_help($help).emit();
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}
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}};
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}
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/// The unusual case, where the `has_feature` condition is non-standard.
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macro_rules! gate_alt {
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($visitor:expr, $has_feature:expr, $name:expr, $span:expr, $explain:expr) => {{
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if !$has_feature && !$span.allows_unstable($name) {
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#[allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable
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feature_err(&$visitor.sess, $name, $span, $explain).emit();
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}
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}};
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}
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/// The case involving a multispan.
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macro_rules! gate_multi {
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($visitor:expr, $feature:ident, $spans:expr, $explain:expr) => {{
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if !$visitor.features.$feature() {
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let spans: Vec<_> =
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$spans.filter(|span| !span.allows_unstable(sym::$feature)).collect();
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if !spans.is_empty() {
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feature_err(&$visitor.sess, sym::$feature, spans, $explain).emit();
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}
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}
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}};
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}
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/// The legacy case.
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macro_rules! gate_legacy {
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($visitor:expr, $feature:ident, $span:expr, $explain:expr) => {{
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if !$visitor.features.$feature() && !$span.allows_unstable(sym::$feature) {
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feature_warn(&$visitor.sess, sym::$feature, $span, $explain);
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}
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}};
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}
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pub fn check_attribute(attr: &ast::Attribute, sess: &Session, features: &Features) {
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PostExpansionVisitor { sess, features }.visit_attribute(attr)
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}
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struct PostExpansionVisitor<'a> {
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sess: &'a Session,
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// `sess` contains a `Features`, but this might not be that one.
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features: &'a Features,
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}
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impl<'a> PostExpansionVisitor<'a> {
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#[allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable
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fn check_abi(&self, abi: ast::StrLit) {
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let ast::StrLit { symbol_unescaped, span, .. } = abi;
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match abi::is_enabled(self.features, span, symbol_unescaped.as_str()) {
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Ok(()) => (),
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Err(abi::AbiDisabled::Unstable { feature, explain }) => {
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feature_err_issue(&self.sess, feature, span, GateIssue::Language, explain).emit();
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}
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Err(abi::AbiDisabled::Unrecognized) => {
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if self.sess.opts.pretty.map_or(true, |ppm| ppm.needs_hir()) {
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self.sess.dcx().span_delayed_bug(
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span,
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format!(
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"unrecognized ABI not caught in lowering: {}",
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symbol_unescaped.as_str()
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),
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);
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}
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}
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}
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}
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fn check_extern(&self, ext: ast::Extern) {
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if let ast::Extern::Explicit(abi, _) = ext {
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self.check_abi(abi);
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}
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}
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/// Feature gate `impl Trait` inside `type Alias = $type_expr;`.
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fn check_impl_trait(&self, ty: &ast::Ty, in_associated_ty: bool) {
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struct ImplTraitVisitor<'a> {
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vis: &'a PostExpansionVisitor<'a>,
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in_associated_ty: bool,
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}
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impl Visitor<'_> for ImplTraitVisitor<'_> {
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fn visit_ty(&mut self, ty: &ast::Ty) {
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if let ast::TyKind::ImplTrait(..) = ty.kind {
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if self.in_associated_ty {
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gate!(
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&self.vis,
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impl_trait_in_assoc_type,
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ty.span,
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"`impl Trait` in associated types is unstable"
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);
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} else {
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gate!(
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&self.vis,
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type_alias_impl_trait,
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ty.span,
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"`impl Trait` in type aliases is unstable"
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);
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}
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}
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visit::walk_ty(self, ty);
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}
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}
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ImplTraitVisitor { vis: self, in_associated_ty }.visit_ty(ty);
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}
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fn check_late_bound_lifetime_defs(&self, params: &[ast::GenericParam]) {
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// Check only lifetime parameters are present and that the
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// generic parameters that are present have no bounds.
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let non_lt_param_spans = params.iter().filter_map(|param| match param.kind {
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ast::GenericParamKind::Lifetime { .. } => None,
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_ => Some(param.ident.span),
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});
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gate_multi!(
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&self,
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non_lifetime_binders,
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non_lt_param_spans,
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crate::fluent_generated::ast_passes_forbidden_non_lifetime_param
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);
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// FIXME(non_lifetime_binders): Const bound params are pretty broken.
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// Let's keep users from using this feature accidentally.
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if self.features.non_lifetime_binders() {
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let const_param_spans: Vec<_> = params
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.iter()
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.filter_map(|param| match param.kind {
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ast::GenericParamKind::Const { .. } => Some(param.ident.span),
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_ => None,
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})
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.collect();
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if !const_param_spans.is_empty() {
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self.sess.dcx().emit_err(errors::ForbiddenConstParam { const_param_spans });
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}
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}
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for param in params {
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if !param.bounds.is_empty() {
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let spans: Vec<_> = param.bounds.iter().map(|b| b.span()).collect();
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self.sess.dcx().emit_err(errors::ForbiddenBound { spans });
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}
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}
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}
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}
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impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
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fn visit_attribute(&mut self, attr: &ast::Attribute) {
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let attr_info = attr.ident().and_then(|ident| BUILTIN_ATTRIBUTE_MAP.get(&ident.name));
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// Check feature gates for built-in attributes.
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if let Some(BuiltinAttribute {
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gate: AttributeGate::Gated(_, name, descr, has_feature),
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..
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}) = attr_info
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{
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gate_alt!(self, has_feature(self.features), *name, attr.span, *descr);
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}
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// Check unstable flavors of the `#[doc]` attribute.
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if attr.has_name(sym::doc) {
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for meta_item_inner in attr.meta_item_list().unwrap_or_default() {
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macro_rules! gate_doc { ($($s:literal { $($name:ident => $feature:ident)* })*) => {
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$($(if meta_item_inner.has_name(sym::$name) {
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let msg = concat!("`#[doc(", stringify!($name), ")]` is ", $s);
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gate!(self, $feature, attr.span, msg);
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})*)*
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}}
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gate_doc!(
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"experimental" {
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cfg => doc_cfg
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cfg_hide => doc_cfg_hide
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masked => doc_masked
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notable_trait => doc_notable_trait
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}
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"meant for internal use only" {
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keyword => rustdoc_internals
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fake_variadic => rustdoc_internals
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}
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);
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}
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}
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// Emit errors for non-staged-api crates.
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if !self.features.staged_api() {
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if attr.has_name(sym::unstable)
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|| attr.has_name(sym::stable)
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|| attr.has_name(sym::rustc_const_unstable)
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|| attr.has_name(sym::rustc_const_stable)
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|| attr.has_name(sym::rustc_default_body_unstable)
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{
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self.sess.dcx().emit_err(errors::StabilityOutsideStd { span: attr.span });
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}
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}
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}
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fn visit_item(&mut self, i: &'a ast::Item) {
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match &i.kind {
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ast::ItemKind::ForeignMod(foreign_module) => {
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if let Some(abi) = foreign_module.abi {
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self.check_abi(abi);
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}
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}
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ast::ItemKind::Fn(..) => {
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if attr::contains_name(&i.attrs, sym::start) {
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gate!(
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&self,
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start,
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i.span,
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"`#[start]` functions are experimental and their signature may change \
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over time"
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);
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}
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}
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ast::ItemKind::Struct(..) => {
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for attr in attr::filter_by_name(&i.attrs, sym::repr) {
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for item in attr.meta_item_list().unwrap_or_else(ThinVec::new) {
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if item.has_name(sym::simd) {
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gate!(
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&self,
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repr_simd,
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attr.span,
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"SIMD types are experimental and possibly buggy"
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);
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}
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}
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}
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}
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ast::ItemKind::Impl(box ast::Impl { polarity, defaultness, of_trait, .. }) => {
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if let &ast::ImplPolarity::Negative(span) = polarity {
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gate!(
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&self,
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negative_impls,
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span.to(of_trait.as_ref().map_or(span, |t| t.path.span)),
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"negative trait bounds are not yet fully implemented; \
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use marker types for now"
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);
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}
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if let ast::Defaultness::Default(_) = defaultness {
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gate!(&self, specialization, i.span, "specialization is unstable");
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}
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}
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ast::ItemKind::Trait(box ast::Trait { is_auto: ast::IsAuto::Yes, .. }) => {
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gate!(
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&self,
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auto_traits,
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i.span,
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"auto traits are experimental and possibly buggy"
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);
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}
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ast::ItemKind::TraitAlias(..) => {
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gate!(&self, trait_alias, i.span, "trait aliases are experimental");
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}
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ast::ItemKind::MacroDef(ast::MacroDef { macro_rules: false, .. }) => {
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let msg = "`macro` is experimental";
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gate!(&self, decl_macro, i.span, msg);
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}
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ast::ItemKind::TyAlias(box ast::TyAlias { ty: Some(ty), .. }) => {
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self.check_impl_trait(ty, false)
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}
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_ => {}
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}
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visit::walk_item(self, i);
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}
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fn visit_foreign_item(&mut self, i: &'a ast::ForeignItem) {
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match i.kind {
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ast::ForeignItemKind::Fn(..) | ast::ForeignItemKind::Static(..) => {
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let link_name = attr::first_attr_value_str_by_name(&i.attrs, sym::link_name);
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let links_to_llvm = link_name.is_some_and(|val| val.as_str().starts_with("llvm."));
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if links_to_llvm {
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gate!(
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&self,
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link_llvm_intrinsics,
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i.span,
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"linking to LLVM intrinsics is experimental"
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);
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}
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}
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ast::ForeignItemKind::TyAlias(..) => {
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gate!(&self, extern_types, i.span, "extern types are experimental");
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}
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ast::ForeignItemKind::MacCall(..) => {}
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}
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visit::walk_item(self, i)
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}
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fn visit_ty(&mut self, ty: &'a ast::Ty) {
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match &ty.kind {
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ast::TyKind::BareFn(bare_fn_ty) => {
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// Function pointers cannot be `const`
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self.check_extern(bare_fn_ty.ext);
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self.check_late_bound_lifetime_defs(&bare_fn_ty.generic_params);
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}
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ast::TyKind::Never => {
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gate!(&self, never_type, ty.span, "the `!` type is experimental");
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}
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ast::TyKind::Pat(..) => {
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gate!(&self, pattern_types, ty.span, "pattern types are unstable");
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}
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_ => {}
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}
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visit::walk_ty(self, ty)
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}
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fn visit_generics(&mut self, g: &'a ast::Generics) {
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for predicate in &g.where_clause.predicates {
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match predicate {
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ast::WherePredicate::BoundPredicate(bound_pred) => {
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// A type bound (e.g., `for<'c> Foo: Send + Clone + 'c`).
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self.check_late_bound_lifetime_defs(&bound_pred.bound_generic_params);
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}
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_ => {}
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}
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}
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visit::walk_generics(self, g);
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}
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fn visit_fn_ret_ty(&mut self, ret_ty: &'a ast::FnRetTy) {
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if let ast::FnRetTy::Ty(output_ty) = ret_ty {
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if let ast::TyKind::Never = output_ty.kind {
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// Do nothing.
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} else {
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self.visit_ty(output_ty)
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}
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}
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}
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fn visit_generic_args(&mut self, args: &'a ast::GenericArgs) {
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// This check needs to happen here because the never type can be returned from a function,
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// but cannot be used in any other context. If this check was in `visit_fn_ret_ty`, it
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// include both functions and generics like `impl Fn() -> !`.
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if let ast::GenericArgs::Parenthesized(generic_args) = args
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&& let ast::FnRetTy::Ty(ref ty) = generic_args.output
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&& matches!(ty.kind, ast::TyKind::Never)
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{
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gate!(&self, never_type, ty.span, "the `!` type is experimental");
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}
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visit::walk_generic_args(self, args);
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}
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fn visit_expr(&mut self, e: &'a ast::Expr) {
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match e.kind {
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ast::ExprKind::TryBlock(_) => {
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gate!(&self, try_blocks, e.span, "`try` expression is experimental");
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}
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ast::ExprKind::Lit(token::Lit { kind: token::LitKind::Float, suffix, .. }) => {
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match suffix {
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Some(sym::f16) => {
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gate!(&self, f16, e.span, "the type `f16` is unstable")
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}
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Some(sym::f128) => {
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gate!(&self, f128, e.span, "the type `f128` is unstable")
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}
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_ => (),
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}
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}
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_ => {}
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}
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visit::walk_expr(self, e)
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}
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fn visit_pat(&mut self, pattern: &'a ast::Pat) {
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match &pattern.kind {
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PatKind::Slice(pats) => {
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for pat in pats {
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let inner_pat = match &pat.kind {
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PatKind::Ident(.., Some(pat)) => pat,
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_ => pat,
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};
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if let PatKind::Range(Some(_), None, Spanned { .. }) = inner_pat.kind {
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gate!(
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&self,
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half_open_range_patterns_in_slices,
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pat.span,
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"`X..` patterns in slices are experimental"
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);
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}
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}
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}
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PatKind::Box(..) => {
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gate!(&self, box_patterns, pattern.span, "box pattern syntax is experimental");
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}
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_ => {}
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}
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visit::walk_pat(self, pattern)
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}
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fn visit_poly_trait_ref(&mut self, t: &'a ast::PolyTraitRef) {
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self.check_late_bound_lifetime_defs(&t.bound_generic_params);
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visit::walk_poly_trait_ref(self, t);
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}
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fn visit_fn(&mut self, fn_kind: FnKind<'a>, span: Span, _: NodeId) {
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if let Some(header) = fn_kind.header() {
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// Stability of const fn methods are covered in `visit_assoc_item` below.
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self.check_extern(header.ext);
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}
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if let FnKind::Closure(ast::ClosureBinder::For { generic_params, .. }, ..) = fn_kind {
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self.check_late_bound_lifetime_defs(generic_params);
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}
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if fn_kind.ctxt() != Some(FnCtxt::Foreign) && fn_kind.decl().c_variadic() {
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gate!(&self, c_variadic, span, "C-variadic functions are unstable");
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}
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visit::walk_fn(self, fn_kind)
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}
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fn visit_assoc_item(&mut self, i: &'a ast::AssocItem, ctxt: AssocCtxt) {
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let is_fn = match &i.kind {
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ast::AssocItemKind::Fn(_) => true,
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ast::AssocItemKind::Type(box ast::TyAlias { ty, .. }) => {
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if let (Some(_), AssocCtxt::Trait) = (ty, ctxt) {
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gate!(
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&self,
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associated_type_defaults,
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i.span,
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"associated type defaults are unstable"
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);
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}
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if let Some(ty) = ty {
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self.check_impl_trait(ty, true);
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}
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false
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}
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_ => false,
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};
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if let ast::Defaultness::Default(_) = i.kind.defaultness() {
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// Limit `min_specialization` to only specializing functions.
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gate_alt!(
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&self,
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self.features.specialization() || (is_fn && self.features.min_specialization()),
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sym::specialization,
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i.span,
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"specialization is unstable"
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);
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}
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visit::walk_assoc_item(self, i, ctxt)
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}
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}
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pub fn check_crate(krate: &ast::Crate, sess: &Session, features: &Features) {
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maybe_stage_features(sess, features, krate);
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check_incompatible_features(sess, features);
|
|
check_new_solver_banned_features(sess, features);
|
|
|
|
let mut visitor = PostExpansionVisitor { sess, features };
|
|
|
|
let spans = sess.psess.gated_spans.spans.borrow();
|
|
macro_rules! gate_all {
|
|
($gate:ident, $msg:literal) => {
|
|
if let Some(spans) = spans.get(&sym::$gate) {
|
|
for span in spans {
|
|
gate!(&visitor, $gate, *span, $msg);
|
|
}
|
|
}
|
|
};
|
|
($gate:ident, $msg:literal, $help:literal) => {
|
|
if let Some(spans) = spans.get(&sym::$gate) {
|
|
for span in spans {
|
|
gate!(&visitor, $gate, *span, $msg, $help);
|
|
}
|
|
}
|
|
};
|
|
}
|
|
gate_all!(
|
|
if_let_guard,
|
|
"`if let` guards are experimental",
|
|
"you can write `if matches!(<expr>, <pattern>)` instead of `if let <pattern> = <expr>`"
|
|
);
|
|
gate_all!(let_chains, "`let` expressions in this position are unstable");
|
|
gate_all!(
|
|
async_closure,
|
|
"async closures are unstable",
|
|
"to use an async block, remove the `||`: `async {`"
|
|
);
|
|
gate_all!(async_for_loop, "`for await` loops are experimental");
|
|
gate_all!(
|
|
closure_lifetime_binder,
|
|
"`for<...>` binders for closures are experimental",
|
|
"consider removing `for<...>`"
|
|
);
|
|
gate_all!(more_qualified_paths, "usage of qualified paths in this context is experimental");
|
|
for &span in spans.get(&sym::yield_expr).iter().copied().flatten() {
|
|
if !span.at_least_rust_2024() {
|
|
gate!(&visitor, coroutines, span, "yield syntax is experimental");
|
|
}
|
|
}
|
|
gate_all!(gen_blocks, "gen blocks are experimental");
|
|
gate_all!(const_trait_impl, "const trait impls are experimental");
|
|
gate_all!(
|
|
half_open_range_patterns_in_slices,
|
|
"half-open range patterns in slices are unstable"
|
|
);
|
|
gate_all!(inline_const_pat, "inline-const in pattern position is experimental");
|
|
gate_all!(associated_const_equality, "associated const equality is incomplete");
|
|
gate_all!(yeet_expr, "`do yeet` expression is experimental");
|
|
gate_all!(dyn_star, "`dyn*` trait objects are experimental");
|
|
gate_all!(const_closures, "const closures are experimental");
|
|
gate_all!(builtin_syntax, "`builtin #` syntax is unstable");
|
|
gate_all!(explicit_tail_calls, "`become` expression is experimental");
|
|
gate_all!(generic_const_items, "generic const items are experimental");
|
|
gate_all!(fn_delegation, "functions delegation is not yet fully implemented");
|
|
gate_all!(postfix_match, "postfix match is experimental");
|
|
gate_all!(mut_ref, "mutable by-reference bindings are experimental");
|
|
gate_all!(global_registration, "global registration is experimental");
|
|
gate_all!(return_type_notation, "return type notation is experimental");
|
|
gate_all!(pin_ergonomics, "pinned reference syntax is experimental");
|
|
|
|
if !visitor.features.never_patterns() {
|
|
if let Some(spans) = spans.get(&sym::never_patterns) {
|
|
for &span in spans {
|
|
if span.allows_unstable(sym::never_patterns) {
|
|
continue;
|
|
}
|
|
let sm = sess.source_map();
|
|
// We gate two types of spans: the span of a `!` pattern, and the span of a
|
|
// match arm without a body. For the latter we want to give the user a normal
|
|
// error.
|
|
if let Ok(snippet) = sm.span_to_snippet(span)
|
|
&& snippet == "!"
|
|
{
|
|
#[allow(rustc::untranslatable_diagnostic)] // FIXME: make this translatable
|
|
feature_err(sess, sym::never_patterns, span, "`!` patterns are experimental")
|
|
.emit();
|
|
} else {
|
|
let suggestion = span.shrink_to_hi();
|
|
sess.dcx().emit_err(errors::MatchArmWithNoBody { span, suggestion });
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if !visitor.features.negative_bounds() {
|
|
for &span in spans.get(&sym::negative_bounds).iter().copied().flatten() {
|
|
sess.dcx().emit_err(errors::NegativeBoundUnsupported { span });
|
|
}
|
|
}
|
|
|
|
// All uses of `gate_all_legacy_dont_use!` below this point were added in #65742,
|
|
// and subsequently disabled (with the non-early gating readded).
|
|
// We emit an early future-incompatible warning for these.
|
|
// New syntax gates should go above here to get a hard error gate.
|
|
macro_rules! gate_all_legacy_dont_use {
|
|
($gate:ident, $msg:literal) => {
|
|
for span in spans.get(&sym::$gate).unwrap_or(&vec![]) {
|
|
gate_legacy!(&visitor, $gate, *span, $msg);
|
|
}
|
|
};
|
|
}
|
|
|
|
gate_all_legacy_dont_use!(box_patterns, "box pattern syntax is experimental");
|
|
gate_all_legacy_dont_use!(trait_alias, "trait aliases are experimental");
|
|
gate_all_legacy_dont_use!(decl_macro, "`macro` is experimental");
|
|
gate_all_legacy_dont_use!(try_blocks, "`try` blocks are unstable");
|
|
gate_all_legacy_dont_use!(auto_traits, "`auto` traits are unstable");
|
|
|
|
visit::walk_crate(&mut visitor, krate);
|
|
}
|
|
|
|
fn maybe_stage_features(sess: &Session, features: &Features, krate: &ast::Crate) {
|
|
// checks if `#![feature]` has been used to enable any feature.
|
|
if sess.opts.unstable_features.is_nightly_build() {
|
|
return;
|
|
}
|
|
if features.enabled_features().is_empty() {
|
|
return;
|
|
}
|
|
let mut errored = false;
|
|
for attr in krate.attrs.iter().filter(|attr| attr.has_name(sym::feature)) {
|
|
// `feature(...)` used on non-nightly. This is definitely an error.
|
|
let mut err = errors::FeatureOnNonNightly {
|
|
span: attr.span,
|
|
channel: option_env!("CFG_RELEASE_CHANNEL").unwrap_or("(unknown)"),
|
|
stable_features: vec![],
|
|
sugg: None,
|
|
};
|
|
|
|
let mut all_stable = true;
|
|
for ident in attr.meta_item_list().into_iter().flatten().flat_map(|nested| nested.ident()) {
|
|
let name = ident.name;
|
|
let stable_since = features
|
|
.enabled_lang_features()
|
|
.iter()
|
|
.find(|feat| feat.gate_name == name)
|
|
.map(|feat| feat.stable_since)
|
|
.flatten();
|
|
if let Some(since) = stable_since {
|
|
err.stable_features.push(errors::StableFeature { name, since });
|
|
} else {
|
|
all_stable = false;
|
|
}
|
|
}
|
|
if all_stable {
|
|
err.sugg = Some(attr.span);
|
|
}
|
|
sess.dcx().emit_err(err);
|
|
errored = true;
|
|
}
|
|
// Just make sure we actually error if anything is listed in `enabled_features`.
|
|
assert!(errored);
|
|
}
|
|
|
|
fn check_incompatible_features(sess: &Session, features: &Features) {
|
|
let enabled_lang_features =
|
|
features.enabled_lang_features().iter().map(|feat| (feat.gate_name, feat.attr_sp));
|
|
let enabled_lib_features =
|
|
features.enabled_lib_features().iter().map(|feat| (feat.gate_name, feat.attr_sp));
|
|
let enabled_features = enabled_lang_features.chain(enabled_lib_features);
|
|
|
|
for (f1, f2) in rustc_feature::INCOMPATIBLE_FEATURES
|
|
.iter()
|
|
.filter(|(f1, f2)| features.enabled(*f1) && features.enabled(*f2))
|
|
{
|
|
if let Some((f1_name, f1_span)) = enabled_features.clone().find(|(name, _)| name == f1) {
|
|
if let Some((f2_name, f2_span)) = enabled_features.clone().find(|(name, _)| name == f2)
|
|
{
|
|
let spans = vec![f1_span, f2_span];
|
|
sess.dcx().emit_err(errors::IncompatibleFeatures {
|
|
spans,
|
|
f1: f1_name,
|
|
f2: f2_name,
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn check_new_solver_banned_features(sess: &Session, features: &Features) {
|
|
if !sess.opts.unstable_opts.next_solver.globally {
|
|
return;
|
|
}
|
|
|
|
// Ban GCE with the new solver, because it does not implement GCE correctly.
|
|
if let Some(gce_span) = features
|
|
.enabled_lang_features()
|
|
.iter()
|
|
.find(|feat| feat.gate_name == sym::generic_const_exprs)
|
|
.map(|feat| feat.attr_sp)
|
|
{
|
|
sess.dcx().emit_err(errors::IncompatibleFeatures {
|
|
spans: vec![gce_span],
|
|
f1: Symbol::intern("-Znext-solver=globally"),
|
|
f2: sym::generic_const_exprs,
|
|
});
|
|
}
|
|
}
|