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Rollup merge of #96271 - compiler-errors:suggest-question-mark, r=estebank
suggest `?` when method is missing on `Result<T, _>` but found on `T` The wording needs help, I think. Fixes #95729
This commit is contained in:
commit
7d4cf710e2
@ -978,45 +978,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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label_span_not_found(&mut err);
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}
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if let SelfSource::MethodCall(expr) = source
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&& let Some((fields, substs)) = self.get_field_candidates(span, actual)
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{
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let call_expr =
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self.tcx.hir().expect_expr(self.tcx.hir().get_parent_node(expr.hir_id));
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for candidate_field in fields.iter() {
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if let Some(field_path) = self.check_for_nested_field_satisfying(
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span,
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&|_, field_ty| {
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self.lookup_probe(
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span,
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item_name,
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field_ty,
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call_expr,
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ProbeScope::AllTraits,
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)
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.is_ok()
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},
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candidate_field,
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substs,
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vec![],
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self.tcx.parent_module(expr.hir_id).to_def_id(),
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) {
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let field_path_str = field_path
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.iter()
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.map(|id| id.name.to_ident_string())
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.collect::<Vec<String>>()
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.join(".");
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debug!("field_path_str: {:?}", field_path_str);
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self.check_for_field_method(&mut err, source, span, actual, item_name);
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err.span_suggestion_verbose(
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item_name.span.shrink_to_lo(),
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"one of the expressions' fields has a method of the same name",
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format!("{field_path_str}."),
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Applicability::MaybeIncorrect,
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);
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}
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}
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}
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self.check_for_unwrap_self(&mut err, source, span, actual, item_name);
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bound_spans.sort();
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bound_spans.dedup();
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@ -1343,6 +1307,145 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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false
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}
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fn check_for_field_method(
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&self,
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err: &mut DiagnosticBuilder<'tcx, ErrorGuaranteed>,
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source: SelfSource<'tcx>,
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span: Span,
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actual: Ty<'tcx>,
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item_name: Ident,
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) {
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if let SelfSource::MethodCall(expr) = source
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&& let Some((fields, substs)) = self.get_field_candidates(span, actual)
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{
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let call_expr = self.tcx.hir().expect_expr(self.tcx.hir().get_parent_node(expr.hir_id));
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for candidate_field in fields.iter() {
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if let Some(field_path) = self.check_for_nested_field_satisfying(
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span,
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&|_, field_ty| {
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self.lookup_probe(
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span,
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item_name,
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field_ty,
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call_expr,
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ProbeScope::AllTraits,
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)
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.is_ok()
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},
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candidate_field,
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substs,
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vec![],
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self.tcx.parent_module(expr.hir_id).to_def_id(),
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) {
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let field_path_str = field_path
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.iter()
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.map(|id| id.name.to_ident_string())
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.collect::<Vec<String>>()
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.join(".");
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debug!("field_path_str: {:?}", field_path_str);
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err.span_suggestion_verbose(
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item_name.span.shrink_to_lo(),
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"one of the expressions' fields has a method of the same name",
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format!("{field_path_str}."),
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Applicability::MaybeIncorrect,
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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_for_unwrap_self(
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&self,
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err: &mut DiagnosticBuilder<'tcx, ErrorGuaranteed>,
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source: SelfSource<'tcx>,
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span: Span,
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actual: Ty<'tcx>,
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item_name: Ident,
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) {
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let tcx = self.tcx;
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let SelfSource::MethodCall(expr) = source else { return; };
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let call_expr = tcx.hir().expect_expr(tcx.hir().get_parent_node(expr.hir_id));
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let ty::Adt(kind, substs) = actual.kind() else { return; };
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if !kind.is_enum() {
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return;
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}
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let matching_variants: Vec<_> = kind
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.variants()
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.iter()
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.flat_map(|variant| {
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let [field] = &variant.fields[..] else { return None; };
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let field_ty = field.ty(tcx, substs);
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// Skip `_`, since that'll just lead to ambiguity.
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if self.resolve_vars_if_possible(field_ty).is_ty_var() {
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return None;
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}
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self.lookup_probe(span, item_name, field_ty, call_expr, ProbeScope::AllTraits)
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.ok()
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.map(|pick| (variant, field, pick))
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})
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.collect();
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let ret_ty_matches = |diagnostic_item| {
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if let Some(ret_ty) = self
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.ret_coercion
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.as_ref()
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.map(|c| self.resolve_vars_if_possible(c.borrow().expected_ty()))
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&& let ty::Adt(kind, _) = ret_ty.kind()
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&& tcx.get_diagnostic_item(diagnostic_item) == Some(kind.did())
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{
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true
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} else {
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false
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}
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};
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match &matching_variants[..] {
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[(_, field, pick)] => {
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let self_ty = field.ty(tcx, substs);
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err.span_note(
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tcx.def_span(pick.item.def_id),
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&format!("the method `{item_name}` exists on the type `{self_ty}`"),
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);
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let (article, kind, variant, question) =
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if Some(kind.did()) == tcx.get_diagnostic_item(sym::Result) {
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("a", "Result", "Err", ret_ty_matches(sym::Result))
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} else if Some(kind.did()) == tcx.get_diagnostic_item(sym::Option) {
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("an", "Option", "None", ret_ty_matches(sym::Option))
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} else {
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return;
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};
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if question {
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err.span_suggestion_verbose(
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expr.span.shrink_to_hi(),
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format!(
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"use the `?` operator to extract the `{self_ty}` value, propagating \
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{article} `{kind}::{variant}` value to the caller"
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),
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"?".to_owned(),
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Applicability::MachineApplicable,
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);
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} else {
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err.span_suggestion_verbose(
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expr.span.shrink_to_hi(),
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format!(
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"consider using `{kind}::expect` to unwrap the `{self_ty}` value, \
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panicking if the value is {article} `{kind}::{variant}`"
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),
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".expect(\"REASON\")".to_owned(),
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Applicability::HasPlaceholders,
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);
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}
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}
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// FIXME(compiler-errors): Support suggestions for other matching enum variants
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_ => {}
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}
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}
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pub(crate) fn note_unmet_impls_on_type(
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&self,
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err: &mut Diagnostic,
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@ -1662,13 +1765,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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(self.tcx.mk_mut_ref(self.tcx.lifetimes.re_erased, rcvr_ty), "&mut "),
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(self.tcx.mk_imm_ref(self.tcx.lifetimes.re_erased, rcvr_ty), "&"),
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] {
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match self.lookup_probe(
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span,
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item_name,
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*rcvr_ty,
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rcvr,
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crate::check::method::probe::ProbeScope::AllTraits,
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) {
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match self.lookup_probe(span, item_name, *rcvr_ty, rcvr, ProbeScope::AllTraits) {
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Ok(pick) => {
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// If the method is defined for the receiver we have, it likely wasn't `use`d.
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// We point at the method, but we just skip the rest of the check for arbitrary
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@ -1700,13 +1797,15 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
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(self.tcx.mk_diagnostic_item(*rcvr_ty, sym::Arc), "Arc::new"),
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(self.tcx.mk_diagnostic_item(*rcvr_ty, sym::Rc), "Rc::new"),
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] {
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if let Some(new_rcvr_t) = *rcvr_ty && let Ok(pick) = self.lookup_probe(
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span,
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item_name,
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new_rcvr_t,
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rcvr,
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crate::check::method::probe::ProbeScope::AllTraits,
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) {
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if let Some(new_rcvr_t) = *rcvr_ty
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&& let Ok(pick) = self.lookup_probe(
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span,
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item_name,
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new_rcvr_t,
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rcvr,
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ProbeScope::AllTraits,
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)
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{
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debug!("try_alt_rcvr: pick candidate {:?}", pick);
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let did = Some(pick.item.container.id());
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// We don't want to suggest a container type when the missing
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|
59
src/test/ui/suggestions/enum-method-probe.fixed
Normal file
59
src/test/ui/suggestions/enum-method-probe.fixed
Normal file
@ -0,0 +1,59 @@
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// compile-flags: --edition=2021
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// run-rustfix
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#![allow(unused)]
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struct Foo;
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impl Foo {
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fn get(&self) -> u8 {
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42
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}
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}
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fn test_result_in_result() -> Result<(), ()> {
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let res: Result<_, ()> = Ok(Foo);
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res?.get();
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//~^ ERROR no method named `get` found for enum `Result` in the current scope
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//~| HELP use the `?` operator
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Ok(())
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}
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async fn async_test_result_in_result() -> Result<(), ()> {
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let res: Result<_, ()> = Ok(Foo);
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res?.get();
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//~^ ERROR no method named `get` found for enum `Result` in the current scope
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//~| HELP use the `?` operator
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Ok(())
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}
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fn test_result_in_unit_return() {
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let res: Result<_, ()> = Ok(Foo);
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res.expect("REASON").get();
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//~^ ERROR no method named `get` found for enum `Result` in the current scope
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//~| HELP consider using `Result::expect` to unwrap the `Foo` value, panicking if the value is a `Result::Err`
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}
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async fn async_test_result_in_unit_return() {
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let res: Result<_, ()> = Ok(Foo);
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res.expect("REASON").get();
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//~^ ERROR no method named `get` found for enum `Result` in the current scope
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//~| HELP consider using `Result::expect` to unwrap the `Foo` value, panicking if the value is a `Result::Err`
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}
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fn test_option_in_option() -> Option<()> {
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let res: Option<_> = Some(Foo);
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res?.get();
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//~^ ERROR no method named `get` found for enum `Option` in the current scope
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//~| HELP use the `?` operator
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Some(())
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}
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fn test_option_in_unit_return() {
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let res: Option<_> = Some(Foo);
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res.expect("REASON").get();
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//~^ ERROR no method named `get` found for enum `Option` in the current scope
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//~| HELP consider using `Option::expect` to unwrap the `Foo` value, panicking if the value is an `Option::None`
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}
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|
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fn main() {}
|
59
src/test/ui/suggestions/enum-method-probe.rs
Normal file
59
src/test/ui/suggestions/enum-method-probe.rs
Normal file
@ -0,0 +1,59 @@
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// compile-flags: --edition=2021
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// run-rustfix
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#![allow(unused)]
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||||
|
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struct Foo;
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||||
|
||||
impl Foo {
|
||||
fn get(&self) -> u8 {
|
||||
42
|
||||
}
|
||||
}
|
||||
|
||||
fn test_result_in_result() -> Result<(), ()> {
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||||
let res: Result<_, ()> = Ok(Foo);
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||||
res.get();
|
||||
//~^ ERROR no method named `get` found for enum `Result` in the current scope
|
||||
//~| HELP use the `?` operator
|
||||
Ok(())
|
||||
}
|
||||
|
||||
async fn async_test_result_in_result() -> Result<(), ()> {
|
||||
let res: Result<_, ()> = Ok(Foo);
|
||||
res.get();
|
||||
//~^ ERROR no method named `get` found for enum `Result` in the current scope
|
||||
//~| HELP use the `?` operator
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn test_result_in_unit_return() {
|
||||
let res: Result<_, ()> = Ok(Foo);
|
||||
res.get();
|
||||
//~^ ERROR no method named `get` found for enum `Result` in the current scope
|
||||
//~| HELP consider using `Result::expect` to unwrap the `Foo` value, panicking if the value is a `Result::Err`
|
||||
}
|
||||
|
||||
async fn async_test_result_in_unit_return() {
|
||||
let res: Result<_, ()> = Ok(Foo);
|
||||
res.get();
|
||||
//~^ ERROR no method named `get` found for enum `Result` in the current scope
|
||||
//~| HELP consider using `Result::expect` to unwrap the `Foo` value, panicking if the value is a `Result::Err`
|
||||
}
|
||||
|
||||
fn test_option_in_option() -> Option<()> {
|
||||
let res: Option<_> = Some(Foo);
|
||||
res.get();
|
||||
//~^ ERROR no method named `get` found for enum `Option` in the current scope
|
||||
//~| HELP use the `?` operator
|
||||
Some(())
|
||||
}
|
||||
|
||||
fn test_option_in_unit_return() {
|
||||
let res: Option<_> = Some(Foo);
|
||||
res.get();
|
||||
//~^ ERROR no method named `get` found for enum `Option` in the current scope
|
||||
//~| HELP consider using `Option::expect` to unwrap the `Foo` value, panicking if the value is an `Option::None`
|
||||
}
|
||||
|
||||
fn main() {}
|
99
src/test/ui/suggestions/enum-method-probe.stderr
Normal file
99
src/test/ui/suggestions/enum-method-probe.stderr
Normal file
@ -0,0 +1,99 @@
|
||||
error[E0599]: no method named `get` found for enum `Result` in the current scope
|
||||
--> $DIR/enum-method-probe.rs:24:9
|
||||
|
|
||||
LL | res.get();
|
||||
| ^^^ method not found in `Result<Foo, ()>`
|
||||
|
|
||||
note: the method `get` exists on the type `Foo`
|
||||
--> $DIR/enum-method-probe.rs:9:5
|
||||
|
|
||||
LL | fn get(&self) -> u8 {
|
||||
| ^^^^^^^^^^^^^^^^^^^
|
||||
help: use the `?` operator to extract the `Foo` value, propagating a `Result::Err` value to the caller
|
||||
|
|
||||
LL | res?.get();
|
||||
| +
|
||||
|
||||
error[E0599]: no method named `get` found for enum `Result` in the current scope
|
||||
--> $DIR/enum-method-probe.rs:39:9
|
||||
|
|
||||
LL | res.get();
|
||||
| ^^^ method not found in `Result<Foo, ()>`
|
||||
|
|
||||
note: the method `get` exists on the type `Foo`
|
||||
--> $DIR/enum-method-probe.rs:9:5
|
||||
|
|
||||
LL | fn get(&self) -> u8 {
|
||||
| ^^^^^^^^^^^^^^^^^^^
|
||||
help: consider using `Result::expect` to unwrap the `Foo` value, panicking if the value is a `Result::Err`
|
||||
|
|
||||
LL | res.expect("REASON").get();
|
||||
| +++++++++++++++++
|
||||
|
||||
error[E0599]: no method named `get` found for enum `Result` in the current scope
|
||||
--> $DIR/enum-method-probe.rs:16:9
|
||||
|
|
||||
LL | res.get();
|
||||
| ^^^ method not found in `Result<Foo, ()>`
|
||||
|
|
||||
note: the method `get` exists on the type `Foo`
|
||||
--> $DIR/enum-method-probe.rs:9:5
|
||||
|
|
||||
LL | fn get(&self) -> u8 {
|
||||
| ^^^^^^^^^^^^^^^^^^^
|
||||
help: use the `?` operator to extract the `Foo` value, propagating a `Result::Err` value to the caller
|
||||
|
|
||||
LL | res?.get();
|
||||
| +
|
||||
|
||||
error[E0599]: no method named `get` found for enum `Result` in the current scope
|
||||
--> $DIR/enum-method-probe.rs:32:9
|
||||
|
|
||||
LL | res.get();
|
||||
| ^^^ method not found in `Result<Foo, ()>`
|
||||
|
|
||||
note: the method `get` exists on the type `Foo`
|
||||
--> $DIR/enum-method-probe.rs:9:5
|
||||
|
|
||||
LL | fn get(&self) -> u8 {
|
||||
| ^^^^^^^^^^^^^^^^^^^
|
||||
help: consider using `Result::expect` to unwrap the `Foo` value, panicking if the value is a `Result::Err`
|
||||
|
|
||||
LL | res.expect("REASON").get();
|
||||
| +++++++++++++++++
|
||||
|
||||
error[E0599]: no method named `get` found for enum `Option` in the current scope
|
||||
--> $DIR/enum-method-probe.rs:46:9
|
||||
|
|
||||
LL | res.get();
|
||||
| ^^^ method not found in `Option<Foo>`
|
||||
|
|
||||
note: the method `get` exists on the type `Foo`
|
||||
--> $DIR/enum-method-probe.rs:9:5
|
||||
|
|
||||
LL | fn get(&self) -> u8 {
|
||||
| ^^^^^^^^^^^^^^^^^^^
|
||||
help: use the `?` operator to extract the `Foo` value, propagating an `Option::None` value to the caller
|
||||
|
|
||||
LL | res?.get();
|
||||
| +
|
||||
|
||||
error[E0599]: no method named `get` found for enum `Option` in the current scope
|
||||
--> $DIR/enum-method-probe.rs:54:9
|
||||
|
|
||||
LL | res.get();
|
||||
| ^^^ method not found in `Option<Foo>`
|
||||
|
|
||||
note: the method `get` exists on the type `Foo`
|
||||
--> $DIR/enum-method-probe.rs:9:5
|
||||
|
|
||||
LL | fn get(&self) -> u8 {
|
||||
| ^^^^^^^^^^^^^^^^^^^
|
||||
help: consider using `Option::expect` to unwrap the `Foo` value, panicking if the value is an `Option::None`
|
||||
|
|
||||
LL | res.expect("REASON").get();
|
||||
| +++++++++++++++++
|
||||
|
||||
error: aborting due to 6 previous errors
|
||||
|
||||
For more information about this error, try `rustc --explain E0599`.
|
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Reference in New Issue
Block a user