use crate::diagnostics::{ImportSuggestion, LabelSuggestion, TypoSuggestion};
use crate::late::lifetimes::{ElisionFailureInfo, LifetimeContext};
use crate::late::{AliasPossibility, LateResolutionVisitor, RibKind};
-use crate::late::{LifetimeBinderKind, LifetimeRibKind};
+use crate::late::{LifetimeBinderKind, LifetimeRibKind, LifetimeUseSet};
use crate::path_names_to_string;
-use crate::{Finalize, Module, ModuleKind, ModuleOrUniformRoot};
+use crate::{Module, ModuleKind, ModuleOrUniformRoot};
use crate::{PathResult, PathSource, Segment};
-use rustc_ast::visit::FnKind;
+use rustc_ast::visit::{FnCtxt, FnKind, LifetimeCtxt};
use rustc_ast::{
self as ast, AssocItemKind, Expr, ExprKind, GenericParam, GenericParamKind, Item, ItemKind,
NodeId, Path, Ty, TyKind,
};
+use rustc_ast_lowering::ResolverAstLowering;
use rustc_ast_pretty::pprust::path_segment_to_string;
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::{
use rustc_hir::def::{self, CtorKind, CtorOf, DefKind};
use rustc_hir::def_id::{DefId, CRATE_DEF_ID, LOCAL_CRATE};
use rustc_hir::PrimTy;
+use rustc_session::lint;
use rustc_session::parse::feature_err;
use rustc_span::edition::Edition;
use rustc_span::hygiene::MacroKind;
}
}
-crate enum MissingLifetimeSpot<'tcx> {
+pub(crate) enum MissingLifetimeSpot<'tcx> {
Generics(&'tcx hir::Generics<'tcx>),
HigherRanked { span: Span, span_type: ForLifetimeSpanType },
Static,
}
-crate enum ForLifetimeSpanType {
+pub(crate) enum ForLifetimeSpanType {
BoundEmpty,
BoundTail,
TypeEmpty,
}
impl ForLifetimeSpanType {
- crate fn descr(&self) -> &'static str {
+ pub(crate) fn descr(&self) -> &'static str {
match self {
Self::BoundEmpty | Self::BoundTail => "bound",
Self::TypeEmpty | Self::TypeTail => "type",
}
}
- crate fn suggestion(&self, sugg: &str) -> String {
+ pub(crate) fn suggestion(&self, sugg: &str) -> String {
match self {
Self::BoundEmpty | Self::TypeEmpty => format!("for<{}> ", sugg),
Self::BoundTail | Self::TypeTail => format!(", {}", sugg),
}
}
-impl<'tcx> Into<MissingLifetimeSpot<'tcx>> for &'tcx hir::Generics<'tcx> {
+impl<'tcx> Into<MissingLifetimeSpot<'tcx>> for &&'tcx hir::Generics<'tcx> {
fn into(self) -> MissingLifetimeSpot<'tcx> {
MissingLifetimeSpot::Generics(self)
}
let is_enum_variant = &|res| matches!(res, Res::Def(DefKind::Variant, _));
// Make the base error.
+ struct BaseError<'a> {
+ msg: String,
+ fallback_label: String,
+ span: Span,
+ could_be_expr: bool,
+ suggestion: Option<(Span, &'a str, String)>,
+ }
let mut expected = source.descr_expected();
let path_str = Segment::names_to_string(path);
let item_str = path.last().unwrap().ident;
- let (base_msg, fallback_label, base_span, could_be_expr) = if let Some(res) = res {
- (
- format!("expected {}, found {} `{}`", expected, res.descr(), path_str),
- format!("not a {}", expected),
+ let base_error = if let Some(res) = res {
+ BaseError {
+ msg: format!("expected {}, found {} `{}`", expected, res.descr(), path_str),
+ fallback_label: format!("not a {expected}"),
span,
- match res {
+ could_be_expr: match res {
Res::Def(DefKind::Fn, _) => {
// Verify whether this is a fn call or an Fn used as a type.
self.r
| Res::Local(_) => true,
_ => false,
},
- )
+ suggestion: None,
+ }
} else {
let item_span = path.last().unwrap().ident.span;
- let (mod_prefix, mod_str) = if path.len() == 1 {
- (String::new(), "this scope".to_string())
+ let (mod_prefix, mod_str, suggestion) = if path.len() == 1 {
+ debug!(?self.diagnostic_metadata.current_impl_items);
+ debug!(?self.diagnostic_metadata.current_function);
+ let suggestion = if let Some(items) = self.diagnostic_metadata.current_impl_items
+ && let Some((fn_kind, _)) = self.diagnostic_metadata.current_function
+ && self.current_trait_ref.is_none()
+ && let Some(FnCtxt::Assoc(_)) = fn_kind.ctxt()
+ && let Some(item) = items.iter().find(|i| {
+ if let AssocItemKind::Fn(fn_) = &i.kind
+ && !fn_.sig.decl.has_self()
+ && i.ident.name == item_str.name
+ {
+ debug!(?item_str.name);
+ debug!(?fn_.sig.decl.inputs);
+ return true
+ }
+ false
+ })
+ {
+ Some((
+ item_span,
+ "consider using the associated function",
+ format!("Self::{}", item.ident)
+ ))
+ } else {
+ None
+ };
+ (String::new(), "this scope".to_string(), suggestion)
} else if path.len() == 2 && path[0].ident.name == kw::PathRoot {
if self.r.session.edition() > Edition::Edition2015 {
// In edition 2018 onwards, the `::foo` syntax may only pull from the extern prelude
// which overrides all other expectations of item type
expected = "crate";
- (String::new(), "the list of imported crates".to_string())
+ (String::new(), "the list of imported crates".to_string(), None)
} else {
- (String::new(), "the crate root".to_string())
+ (String::new(), "the crate root".to_string(), None)
}
} else if path.len() == 2 && path[0].ident.name == kw::Crate {
- (String::new(), "the crate root".to_string())
+ (String::new(), "the crate root".to_string(), None)
} else {
let mod_path = &path[..path.len() - 1];
- let mod_prefix = match self.resolve_path(mod_path, Some(TypeNS), Finalize::No) {
+ let mod_prefix = match self.resolve_path(mod_path, Some(TypeNS), None) {
PathResult::Module(ModuleOrUniformRoot::Module(module)) => module.res(),
_ => None,
}
.map_or_else(String::new, |res| format!("{} ", res.descr()));
- (mod_prefix, format!("`{}`", Segment::names_to_string(mod_path)))
+ (mod_prefix, format!("`{}`", Segment::names_to_string(mod_path)), None)
};
- (
- format!("cannot find {} `{}` in {}{}", expected, item_str, mod_prefix, mod_str),
- if path_str == "async" && expected.starts_with("struct") {
+ BaseError {
+ msg: format!("cannot find {expected} `{item_str}` in {mod_prefix}{mod_str}"),
+ fallback_label: if path_str == "async" && expected.starts_with("struct") {
"`async` blocks are only allowed in Rust 2018 or later".to_string()
} else {
- format!("not found in {}", mod_str)
+ format!("not found in {mod_str}")
},
- item_span,
- false,
- )
+ span: item_span,
+ could_be_expr: false,
+ suggestion,
+ }
};
let code = source.error_code(res.is_some());
- let mut err = self.r.session.struct_span_err_with_code(base_span, &base_msg, code);
+ let mut err =
+ self.r.session.struct_span_err_with_code(base_error.span, &base_error.msg, code);
+
+ if let Some(sugg) = base_error.suggestion {
+ err.span_suggestion_verbose(sugg.0, sugg.1, sugg.2, Applicability::MaybeIncorrect);
+ }
if let Some(span) = self.diagnostic_metadata.current_block_could_be_bare_struct_literal {
err.multipart_suggestion(
}
}
- self.detect_assoct_type_constraint_meant_as_path(base_span, &mut err);
+ self.detect_assoct_type_constraint_meant_as_path(base_error.span, &mut err);
// Emit special messages for unresolved `Self` and `self`.
if is_self_type(path, ns) {
source,
res,
&path_str,
- &fallback_label,
+ &base_error.fallback_label,
) {
// We do this to avoid losing a secondary span when we override the main error span.
self.r.add_typo_suggestion(&mut err, typo_sugg, ident_span);
}
}
- let is_macro = base_span.from_expansion() && base_span.desugaring_kind().is_none();
- if !self.type_ascription_suggestion(&mut err, base_span) {
+ let is_macro =
+ base_error.span.from_expansion() && base_error.span.desugaring_kind().is_none();
+ if !self.type_ascription_suggestion(&mut err, base_error.span) {
let mut fallback = false;
if let (
PathSource::Trait(AliasPossibility::Maybe),
let spans: Vec<Span> = bounds
.iter()
.map(|bound| bound.span())
- .filter(|&sp| sp != base_span)
+ .filter(|&sp| sp != base_error.span)
.collect();
let start_span = bounds.iter().map(|bound| bound.span()).next().unwrap();
multi_span.push_span_label(sp, msg);
}
multi_span.push_span_label(
- base_span,
+ base_error.span,
"expected this type to be a trait...".to_string(),
);
err.span_help(
);
if bounds.iter().all(|bound| match bound {
ast::GenericBound::Outlives(_) => true,
- ast::GenericBound::Trait(tr, _) => tr.span == base_span,
+ ast::GenericBound::Trait(tr, _) => tr.span == base_error.span,
}) {
let mut sugg = vec![];
- if base_span != start_span {
- sugg.push((start_span.until(base_span), String::new()));
+ if base_error.span != start_span {
+ sugg.push((start_span.until(base_error.span), String::new()));
}
- if base_span != end_span {
- sugg.push((base_span.shrink_to_hi().to(end_span), String::new()));
+ if base_error.span != end_span {
+ sugg.push((base_error.span.shrink_to_hi().to(end_span), String::new()));
}
err.multipart_suggestion(
fallback = true;
match self.diagnostic_metadata.current_let_binding {
Some((pat_sp, Some(ty_sp), None))
- if ty_sp.contains(base_span) && could_be_expr =>
+ if ty_sp.contains(base_error.span) && base_error.could_be_expr =>
{
err.span_suggestion_short(
pat_sp.between(ty_sp),
}
if fallback {
// Fallback label.
- err.span_label(base_span, fallback_label);
+ err.span_label(base_error.span, base_error.fallback_label);
}
}
if let Some(err_code) = &err.code {
if let crate::PathSource::TraitItem(_) = source {
let mod_path = &path[..path.len() - 1];
if let PathResult::Module(ModuleOrUniformRoot::Module(module)) =
- self.resolve_path(mod_path, None, Finalize::No)
+ self.resolve_path(mod_path, None, None)
{
let resolutions = self.r.resolutions(module).borrow();
let targets: Vec<_> =
/// Given the target `ident` and `kind`, search for the similarly named associated item
/// in `self.current_trait_ref`.
- crate fn find_similarly_named_assoc_item(
+ pub(crate) fn find_similarly_named_assoc_item(
&mut self,
ident: Symbol,
kind: &AssocItemKind,
) -> Option<Symbol> {
- let Some((module, _)) = &self.current_trait_ref else {
- return None;
- };
+ let (module, _) = self.current_trait_ref.as_ref()?;
if ident == kw::Underscore {
// We do nothing for `_`.
return None;
// Search in module.
let mod_path = &path[..path.len() - 1];
if let PathResult::Module(ModuleOrUniformRoot::Module(module)) =
- self.resolve_path(mod_path, Some(TypeNS), Finalize::No)
+ self.resolve_path(mod_path, Some(TypeNS), None)
{
self.r.add_module_candidates(module, &mut names, &filter_fn);
}
}
}
- crate fn report_missing_type_error(
+ pub(crate) fn report_missing_type_error(
&self,
path: &[Segment],
) -> Option<(Span, &'static str, String, Applicability)> {
/// Given the target `label`, search the `rib_index`th label rib for similarly named labels,
/// optionally returning the closest match and whether it is reachable.
- crate fn suggestion_for_label_in_rib(
+ pub(crate) fn suggestion_for_label_in_rib(
&self,
rib_index: usize,
label: Ident,
})
}
- crate fn emit_undeclared_lifetime_error(
+ pub(crate) fn maybe_report_lifetime_uses(
+ &mut self,
+ generics_span: Span,
+ params: &[ast::GenericParam],
+ ) {
+ for (param_index, param) in params.iter().enumerate() {
+ let GenericParamKind::Lifetime = param.kind else { continue };
+
+ let def_id = self.r.local_def_id(param.id);
+
+ let use_set = self.lifetime_uses.remove(&def_id);
+ debug!(
+ "Use set for {:?}({:?} at {:?}) is {:?}",
+ def_id, param.ident, param.ident.span, use_set
+ );
+
+ let deletion_span = || {
+ if params.len() == 1 {
+ // if sole lifetime, remove the entire `<>` brackets
+ generics_span
+ } else if param_index == 0 {
+ // if removing within `<>` brackets, we also want to
+ // delete a leading or trailing comma as appropriate
+ param.span().to(params[param_index + 1].span().shrink_to_lo())
+ } else {
+ // if removing within `<>` brackets, we also want to
+ // delete a leading or trailing comma as appropriate
+ params[param_index - 1].span().shrink_to_hi().to(param.span())
+ }
+ };
+ match use_set {
+ Some(LifetimeUseSet::Many) => {}
+ Some(LifetimeUseSet::One { use_span, use_ctxt }) => {
+ debug!(?param.ident, ?param.ident.span, ?use_span);
+
+ let elidable = matches!(use_ctxt, LifetimeCtxt::Rptr);
+
+ let deletion_span = deletion_span();
+ self.r.lint_buffer.buffer_lint_with_diagnostic(
+ lint::builtin::SINGLE_USE_LIFETIMES,
+ param.id,
+ param.ident.span,
+ &format!("lifetime parameter `{}` only used once", param.ident),
+ lint::BuiltinLintDiagnostics::SingleUseLifetime {
+ param_span: param.ident.span,
+ use_span: Some((use_span, elidable)),
+ deletion_span,
+ },
+ );
+ }
+ None => {
+ debug!(?param.ident, ?param.ident.span);
+
+ let deletion_span = deletion_span();
+ self.r.lint_buffer.buffer_lint_with_diagnostic(
+ lint::builtin::UNUSED_LIFETIMES,
+ param.id,
+ param.ident.span,
+ &format!("lifetime parameter `{}` never used", param.ident),
+ lint::BuiltinLintDiagnostics::SingleUseLifetime {
+ param_span: param.ident.span,
+ use_span: None,
+ deletion_span,
+ },
+ );
+ }
+ }
+ }
+ }
+
+ pub(crate) fn emit_undeclared_lifetime_error(
&self,
lifetime_ref: &ast::Lifetime,
outer_lifetime_ref: Option<Ident>,
for rib in self.lifetime_ribs.iter().rev() {
match rib.kind {
- LifetimeRibKind::Generics { span, kind } => {
+ LifetimeRibKind::Generics { binder: _, span, kind } => {
if !span.can_be_used_for_suggestions() && suggest_note {
suggest_note = false; // Avoid displaying the same help multiple times.
err.span_label(
err.emit();
}
+
+ pub(crate) fn emit_non_static_lt_in_const_generic_error(&self, lifetime_ref: &ast::Lifetime) {
+ struct_span_err!(
+ self.r.session,
+ lifetime_ref.ident.span,
+ E0771,
+ "use of non-static lifetime `{}` in const generic",
+ lifetime_ref.ident
+ )
+ .note(
+ "for more information, see issue #74052 \
+ <https://github.com/rust-lang/rust/issues/74052>",
+ )
+ .emit();
+ }
+
+ /// Non-static lifetimes are prohibited in anonymous constants under `min_const_generics`.
+ /// This function will emit an error if `generic_const_exprs` is not enabled, the body identified by
+ /// `body_id` is an anonymous constant and `lifetime_ref` is non-static.
+ pub(crate) fn maybe_emit_forbidden_non_static_lifetime_error(
+ &self,
+ lifetime_ref: &ast::Lifetime,
+ ) {
+ let feature_active = self.r.session.features_untracked().generic_const_exprs;
+ if !feature_active {
+ feature_err(
+ &self.r.session.parse_sess,
+ sym::generic_const_exprs,
+ lifetime_ref.ident.span,
+ "a non-static lifetime is not allowed in a `const`",
+ )
+ .emit();
+ }
+ }
}
impl<'tcx> LifetimeContext<'_, 'tcx> {
- crate fn report_missing_lifetime_specifiers(
+ pub(crate) fn report_missing_lifetime_specifiers(
&self,
spans: Vec<Span>,
count: usize,
}
/// Returns whether to add `'static` lifetime to the suggested lifetime list.
- crate fn report_elision_failure(
+ pub(crate) fn report_elision_failure(
&mut self,
diag: &mut Diagnostic,
params: &[ElisionFailureInfo],
}
}
- // FIXME(const_generics): This patches over an ICE caused by non-'static lifetimes in const
- // generics. We are disallowing this until we can decide on how we want to handle non-'static
- // lifetimes in const generics. See issue #74052 for discussion.
- crate fn emit_non_static_lt_in_const_generic_error(&self, lifetime_ref: &hir::Lifetime) {
- let mut err = struct_span_err!(
- self.tcx.sess,
- lifetime_ref.span,
- E0771,
- "use of non-static lifetime `{}` in const generic",
- lifetime_ref
- );
- err.note(
- "for more information, see issue #74052 \
- <https://github.com/rust-lang/rust/issues/74052>",
- );
- err.emit();
- }
-
- crate fn is_trait_ref_fn_scope(&mut self, trait_ref: &'tcx hir::PolyTraitRef<'tcx>) -> bool {
+ pub(crate) fn is_trait_ref_fn_scope(
+ &mut self,
+ trait_ref: &'tcx hir::PolyTraitRef<'tcx>,
+ ) -> bool {
if let def::Res::Def(_, did) = trait_ref.trait_ref.path.res {
if [
self.tcx.lang_items().fn_once_trait(),
false
}
- crate fn add_missing_lifetime_specifiers_label(
+ pub(crate) fn add_missing_lifetime_specifiers_label(
&self,
err: &mut Diagnostic,
mut spans_with_counts: Vec<(Span, usize)>,
_ => unreachable!(),
}
}
-
- /// Non-static lifetimes are prohibited in anonymous constants under `min_const_generics`.
- /// This function will emit an error if `generic_const_exprs` is not enabled, the body identified by
- /// `body_id` is an anonymous constant and `lifetime_ref` is non-static.
- crate fn maybe_emit_forbidden_non_static_lifetime_error(
- &self,
- body_id: hir::BodyId,
- lifetime_ref: &'tcx hir::Lifetime,
- ) {
- let is_anon_const = matches!(
- self.tcx.def_kind(self.tcx.hir().body_owner_def_id(body_id)),
- hir::def::DefKind::AnonConst
- );
- let is_allowed_lifetime = matches!(
- lifetime_ref.name,
- hir::LifetimeName::Implicit | hir::LifetimeName::Static | hir::LifetimeName::Underscore
- );
-
- if !self.tcx.lazy_normalization() && is_anon_const && !is_allowed_lifetime {
- feature_err(
- &self.tcx.sess.parse_sess,
- sym::generic_const_exprs,
- lifetime_ref.span,
- "a non-static lifetime is not allowed in a `const`",
- )
- .emit();
- }
- }
}
projects / rust.git / blobdiff