+use crate::errors::{
+ AmbigousImpl, AmbigousReturn, AnnotationRequired, InferenceBadError, NeedTypeInfoInGenerator,
+ SourceKindMultiSuggestion, SourceKindSubdiag,
+};
use crate::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
use crate::infer::InferCtxt;
-use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticBuilder, ErrorGuaranteed};
+use rustc_errors::{DiagnosticBuilder, ErrorGuaranteed, IntoDiagnosticArg};
use rustc_hir as hir;
use rustc_hir::def::Res;
use rustc_hir::def::{CtorOf, DefKind, Namespace};
use rustc_middle::ty::subst::{GenericArg, GenericArgKind, Subst, SubstsRef};
use rustc_middle::ty::{self, DefIdTree, InferConst};
use rustc_middle::ty::{IsSuggestable, Ty, TyCtxt, TypeckResults};
+use rustc_session::SessionDiagnostic;
use rustc_span::symbol::{kw, Ident};
use rustc_span::{BytePos, Span};
use std::borrow::Cow;
name: String,
}
+#[derive(Clone)]
pub enum UnderspecifiedArgKind {
Type { prefix: Cow<'static, str> },
Const { is_parameter: bool },
}
impl InferenceDiagnosticsData {
- /// Generate a label for a generic argument which can't be inferred. When not
- /// much is known about the argument, `use_diag` may be used to describe the
- /// labeled value.
- fn cannot_infer_msg(&self) -> String {
- if self.name == "_" && matches!(self.kind, UnderspecifiedArgKind::Type { .. }) {
- return "cannot infer type".to_string();
- }
-
- let suffix = match &self.parent {
- Some(parent) => parent.suffix_string(),
- None => String::new(),
- };
-
- // For example: "cannot infer type for type parameter `T`"
- format!("cannot infer {} `{}`{}", self.kind.prefix_string(), self.name, suffix)
+ fn can_add_more_info(&self) -> bool {
+ !(self.name == "_" && matches!(self.kind, UnderspecifiedArgKind::Type { .. }))
}
- fn where_x_is_specified(&self, in_type: Ty<'_>) -> String {
+ fn where_x_is_kind(&self, in_type: Ty<'_>) -> &'static str {
if in_type.is_ty_infer() {
- String::new()
+ "empty"
} else if self.name == "_" {
// FIXME: Consider specializing this message if there is a single `_`
// in the type.
- ", where the placeholders `_` are specified".to_string()
+ "underscore"
} else {
- format!(", where the {} `{}` is specified", self.kind.prefix_string(), self.name)
+ "has_name"
+ }
+ }
+
+ /// Generate a label for a generic argument which can't be inferred. When not
+ /// much is known about the argument, `use_diag` may be used to describe the
+ /// labeled value.
+ fn make_bad_error(&self, span: Span) -> InferenceBadError<'_> {
+ let has_parent = self.parent.is_some();
+ let bad_kind = if self.can_add_more_info() { "more_info" } else { "other" };
+ let (parent_prefix, parent_name) = self
+ .parent
+ .as_ref()
+ .map(|parent| (parent.prefix, parent.name.clone()))
+ .unwrap_or_default();
+ InferenceBadError {
+ span,
+ bad_kind,
+ prefix_kind: self.kind.clone(),
+ prefix: self.kind.try_get_prefix().unwrap_or_default(),
+ name: self.name.clone(),
+ has_parent,
+ parent_prefix,
+ parent_name,
}
}
}
fn for_def_id(tcx: TyCtxt<'_>, def_id: DefId) -> Option<InferenceDiagnosticsParentData> {
Self::for_parent_def_id(tcx, tcx.parent(def_id))
}
+}
- fn suffix_string(&self) -> String {
- format!(" declared on the {} `{}`", self.prefix, self.name)
+impl IntoDiagnosticArg for UnderspecifiedArgKind {
+ fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+ let kind = match self {
+ Self::Type { .. } => "type",
+ Self::Const { is_parameter: true } => "const_with_param",
+ Self::Const { is_parameter: false } => "const",
+ };
+ rustc_errors::DiagnosticArgValue::Str(kind.into())
}
}
impl UnderspecifiedArgKind {
- fn prefix_string(&self) -> Cow<'static, str> {
+ fn try_get_prefix(&self) -> Option<&str> {
match self {
- Self::Type { prefix } => format!("type for {}", prefix).into(),
- Self::Const { is_parameter: true } => "the value of const parameter".into(),
- Self::Const { is_parameter: false } => "the value of the constant".into(),
+ Self::Type { prefix } => Some(prefix.as_ref()),
+ Self::Const { .. } => None,
}
}
}
}
/// We don't want to directly use `ty_to_string` for closures as their type isn't really
-/// something users are familar with. Directly printing the `fn_sig` of closures also
+/// something users are familiar with. Directly printing the `fn_sig` of closures also
/// doesn't work as they actually use the "rust-call" API.
fn closure_as_fn_str<'tcx>(infcx: &InferCtxt<'_, 'tcx>, ty: Ty<'tcx>) -> String {
let ty::Closure(_, substs) = ty.kind() else { unreachable!() };
arg_data: InferenceDiagnosticsData,
error_code: TypeAnnotationNeeded,
) -> DiagnosticBuilder<'tcx, ErrorGuaranteed> {
- let error_code = error_code.into();
- let mut err =
- self.tcx.sess.struct_span_err_with_code(span, "type annotations needed", error_code);
- err.span_label(span, arg_data.cannot_infer_msg());
- err
+ let source_kind = "other";
+ let source_name = "";
+ let failure_span = None;
+ let infer_subdiags = Vec::new();
+ let multi_suggestions = Vec::new();
+ let bad_label = Some(arg_data.make_bad_error(span));
+ match error_code {
+ TypeAnnotationNeeded::E0282 => AnnotationRequired {
+ span,
+ source_kind,
+ source_name,
+ failure_span,
+ infer_subdiags,
+ multi_suggestions,
+ bad_label,
+ }
+ .into_diagnostic(&self.tcx.sess.parse_sess.span_diagnostic),
+ TypeAnnotationNeeded::E0283 => AmbigousImpl {
+ span,
+ source_kind,
+ source_name,
+ failure_span,
+ infer_subdiags,
+ multi_suggestions,
+ bad_label,
+ }
+ .into_diagnostic(&self.tcx.sess.parse_sess.span_diagnostic),
+ TypeAnnotationNeeded::E0284 => AmbigousReturn {
+ span,
+ source_kind,
+ source_name,
+ failure_span,
+ infer_subdiags,
+ multi_suggestions,
+ bad_label,
+ }
+ .into_diagnostic(&self.tcx.sess.parse_sess.span_diagnostic),
+ }
}
pub fn emit_inference_failure_err(
return self.bad_inference_failure_err(failure_span, arg_data, error_code)
};
- let error_code = error_code.into();
- let mut err = self.tcx.sess.struct_span_err_with_code(
- span,
- &format!("type annotations needed{}", kind.ty_msg(self)),
- error_code,
- );
-
- if should_label_span && !failure_span.overlaps(span) {
- err.span_label(failure_span, "type must be known at this point");
- }
+ let (source_kind, name) = kind.ty_localized_msg(self);
+ let failure_span = if should_label_span && !failure_span.overlaps(span) {
+ Some(failure_span)
+ } else {
+ None
+ };
+ let mut infer_subdiags = Vec::new();
+ let mut multi_suggestions = Vec::new();
match kind {
InferSourceKind::LetBinding { insert_span, pattern_name, ty } => {
- let suggestion_msg = if let Some(name) = pattern_name {
- format!(
- "consider giving `{}` an explicit type{}",
- name,
- arg_data.where_x_is_specified(ty)
- )
- } else {
- format!(
- "consider giving this pattern a type{}",
- arg_data.where_x_is_specified(ty)
- )
- };
- err.span_suggestion_verbose(
- insert_span,
- &suggestion_msg,
- format!(": {}", ty_to_string(self, ty)),
- Applicability::HasPlaceholders,
- );
+ infer_subdiags.push(SourceKindSubdiag::LetLike {
+ span: insert_span,
+ name: pattern_name.map(|name| name.to_string()).unwrap_or_else(String::new),
+ x_kind: arg_data.where_x_is_kind(ty),
+ prefix_kind: arg_data.kind.clone(),
+ prefix: arg_data.kind.try_get_prefix().unwrap_or_default(),
+ arg_name: arg_data.name,
+ kind: if pattern_name.is_some() { "with_pattern" } else { "other" },
+ type_name: ty_to_string(self, ty),
+ });
}
InferSourceKind::ClosureArg { insert_span, ty } => {
- err.span_suggestion_verbose(
- insert_span,
- &format!(
- "consider giving this closure parameter an explicit type{}",
- arg_data.where_x_is_specified(ty)
- ),
- format!(": {}", ty_to_string(self, ty)),
- Applicability::HasPlaceholders,
- );
+ infer_subdiags.push(SourceKindSubdiag::LetLike {
+ span: insert_span,
+ name: String::new(),
+ x_kind: arg_data.where_x_is_kind(ty),
+ prefix_kind: arg_data.kind.clone(),
+ prefix: arg_data.kind.try_get_prefix().unwrap_or_default(),
+ arg_name: arg_data.name,
+ kind: "closure",
+ type_name: ty_to_string(self, ty),
+ });
}
InferSourceKind::GenericArg {
insert_span,
let generics = self.tcx.generics_of(generics_def_id);
let is_type = matches!(arg.unpack(), GenericArgKind::Type(_));
- let cannot_infer_msg = format!(
- "cannot infer {} of the {} parameter `{}`{}",
- if is_type { "type" } else { "the value" },
- if is_type { "type" } else { "const" },
- generics.params[argument_index].name,
- // We use the `generics_def_id` here, as even when suggesting `None::<T>`,
- // the type parameter `T` was still declared on the enum, not on the
- // variant.
+ let (parent_exists, parent_prefix, parent_name) =
InferenceDiagnosticsParentData::for_parent_def_id(self.tcx, generics_def_id)
- .map_or(String::new(), |parent| parent.suffix_string()),
- );
+ .map_or((false, String::new(), String::new()), |parent| {
+ (true, parent.prefix.to_string(), parent.name)
+ });
- err.span_label(span, cannot_infer_msg);
+ infer_subdiags.push(SourceKindSubdiag::GenericLabel {
+ span,
+ is_type,
+ param_name: generics.params[argument_index].name.to_string(),
+ parent_exists,
+ parent_prefix,
+ parent_name,
+ });
let args = fmt_printer(self, Namespace::TypeNS)
.comma_sep(generic_args.iter().copied().map(|arg| {
.unwrap()
.into_buffer();
- err.span_suggestion_verbose(
- insert_span,
- &format!(
- "consider specifying the generic argument{}",
- pluralize!(generic_args.len()),
- ),
- format!("::<{}>", args),
- Applicability::HasPlaceholders,
- );
+ infer_subdiags.push(SourceKindSubdiag::GenericSuggestion {
+ span: insert_span,
+ arg_count: generic_args.len(),
+ args,
+ });
}
InferSourceKind::FullyQualifiedMethodCall { receiver, successor, substs, def_id } => {
let printer = fmt_printer(self, Namespace::ValueNS);
_ => "",
};
- let suggestion = vec![
- (receiver.span.shrink_to_lo(), format!("{def_path}({adjustment}")),
- (receiver.span.shrink_to_hi().with_hi(successor.1), successor.0.to_string()),
- ];
- err.multipart_suggestion_verbose(
- "try using a fully qualified path to specify the expected types",
- suggestion,
- Applicability::HasPlaceholders,
- );
+ multi_suggestions.push(SourceKindMultiSuggestion::new_fully_qualified(
+ receiver.span,
+ def_path,
+ adjustment,
+ successor,
+ ));
}
InferSourceKind::ClosureReturn { ty, data, should_wrap_expr } => {
- let ret = ty_to_string(self, ty);
- let (arrow, post) = match data {
- FnRetTy::DefaultReturn(_) => ("-> ", " "),
- _ => ("", ""),
- };
- let suggestion = match should_wrap_expr {
- Some(end_span) => vec![
- (data.span(), format!("{}{}{}{{ ", arrow, ret, post)),
- (end_span, " }".to_string()),
- ],
- None => vec![(data.span(), format!("{}{}{}", arrow, ret, post))],
- };
- err.multipart_suggestion_verbose(
- "try giving this closure an explicit return type",
- suggestion,
- Applicability::HasPlaceholders,
- );
+ let ty_info = ty_to_string(self, ty);
+ multi_suggestions.push(SourceKindMultiSuggestion::new_closure_return(
+ ty_info,
+ data,
+ should_wrap_expr,
+ ));
+ }
+ }
+ match error_code {
+ TypeAnnotationNeeded::E0282 => AnnotationRequired {
+ span,
+ source_kind,
+ source_name: &name,
+ failure_span,
+ infer_subdiags,
+ multi_suggestions,
+ bad_label: None,
+ }
+ .into_diagnostic(&self.tcx.sess.parse_sess.span_diagnostic),
+ TypeAnnotationNeeded::E0283 => AmbigousImpl {
+ span,
+ source_kind,
+ source_name: &name,
+ failure_span,
+ infer_subdiags,
+ multi_suggestions,
+ bad_label: None,
+ }
+ .into_diagnostic(&self.tcx.sess.parse_sess.span_diagnostic),
+ TypeAnnotationNeeded::E0284 => AmbigousReturn {
+ span,
+ source_kind,
+ source_name: &name,
+ failure_span,
+ infer_subdiags,
+ multi_suggestions,
+ bad_label: None,
}
+ .into_diagnostic(&self.tcx.sess.parse_sess.span_diagnostic),
}
- err
}
pub fn need_type_info_err_in_generator(
let ty = self.resolve_vars_if_possible(ty);
let data = self.extract_inference_diagnostics_data(ty.into(), None);
- let mut err = struct_span_err!(
- self.tcx.sess,
+ NeedTypeInfoInGenerator {
+ bad_label: data.make_bad_error(span),
span,
- E0698,
- "type inside {} must be known in this context",
- kind,
- );
- err.span_label(span, data.cannot_infer_msg());
- err
+ generator_kind: GeneratorKindAsDiagArg(kind),
+ }
+ .into_diagnostic(&self.tcx.sess.parse_sess.span_diagnostic)
+ }
+}
+
+pub struct GeneratorKindAsDiagArg(pub hir::GeneratorKind);
+
+impl IntoDiagnosticArg for GeneratorKindAsDiagArg {
+ fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
+ let kind = match self.0 {
+ hir::GeneratorKind::Async(hir::AsyncGeneratorKind::Block) => "async_block",
+ hir::GeneratorKind::Async(hir::AsyncGeneratorKind::Closure) => "async_closure",
+ hir::GeneratorKind::Async(hir::AsyncGeneratorKind::Fn) => "async_fn",
+ hir::GeneratorKind::Gen => "generator",
+ };
+ rustc_errors::DiagnosticArgValue::Str(kind.into())
}
}
}
impl<'tcx> InferSourceKind<'tcx> {
- fn ty_msg(&self, infcx: &InferCtxt<'_, 'tcx>) -> String {
+ fn ty_localized_msg(&self, infcx: &InferCtxt<'_, 'tcx>) -> (&'static str, String) {
match *self {
InferSourceKind::LetBinding { ty, .. }
| InferSourceKind::ClosureArg { ty, .. }
| InferSourceKind::ClosureReturn { ty, .. } => {
if ty.is_closure() {
- format!(" for the closure `{}`", closure_as_fn_str(infcx, ty))
+ ("closure", closure_as_fn_str(infcx, ty))
} else if !ty.is_ty_infer() {
- format!(" for `{}`", ty_to_string(infcx, ty))
+ ("normal", ty_to_string(infcx, ty))
} else {
- String::new()
+ ("other", String::new())
}
}
// FIXME: We should be able to add some additional info here.
InferSourceKind::GenericArg { .. }
- | InferSourceKind::FullyQualifiedMethodCall { .. } => String::new(),
+ | InferSourceKind::FullyQualifiedMethodCall { .. } => ("other", String::new()),
}
}
}
}
}
}
- hir::ExprKind::MethodCall(segment, _, _) => {
+ hir::ExprKind::MethodCall(segment, ..) => {
if let Some(def_id) = self.typeck_results.type_dependent_def_id(expr.hir_id) {
let generics = tcx.generics_of(def_id);
let insertable: Option<_> = try {
None?
}
let substs = self.node_substs_opt(expr.hir_id)?;
- let span = tcx.hir().span(segment.hir_id?);
+ let span = tcx.hir().span(segment.hir_id);
let insert_span = segment.ident.span.shrink_to_hi().with_hi(span.hi());
InsertableGenericArgs {
insert_span,
path.segments
.iter()
.filter_map(move |segment| {
- let res = segment.res?;
+ let res = segment.res;
let generics_def_id = tcx.res_generics_def_id(res)?;
let generics = tcx.generics_of(generics_def_id);
if generics.has_impl_trait() {
return None;
}
- let span = tcx.hir().span(segment.hir_id?);
+ let span = tcx.hir().span(segment.hir_id);
let insert_span = segment.ident.span.shrink_to_hi().with_hi(span.hi());
Some(InsertableGenericArgs {
insert_span,
if !segment.infer_args || generics.has_impl_trait() {
None?;
}
- let span = tcx.hir().span(segment.hir_id?);
+ let span = tcx.hir().span(segment.hir_id);
let insert_span = segment.ident.span.shrink_to_hi().with_hi(span.hi());
InsertableGenericArgs { insert_span, substs, generics_def_id: def_id, def_id }
};
let generic_args = &generics.own_substs_no_defaults(tcx, substs)
[generics.own_counts().lifetimes..];
let span = match expr.kind {
- ExprKind::MethodCall(path, _, _) => path.ident.span,
+ ExprKind::MethodCall(path, ..) => path.ident.span,
_ => expr.span,
};
})
.any(|generics| generics.has_impl_trait())
};
- if let ExprKind::MethodCall(path, args, span) = expr.kind
+ if let ExprKind::MethodCall(path, receiver, args, span) = expr.kind
&& let Some(substs) = self.node_substs_opt(expr.hir_id)
&& substs.iter().any(|arg| self.generic_arg_contains_target(arg))
&& let Some(def_id) = self.typeck_results.type_dependent_def_id(expr.hir_id)
&& !has_impl_trait(def_id)
{
let successor =
- args.get(1).map_or_else(|| (")", span.hi()), |arg| (", ", arg.span.lo()));
+ args.get(0).map_or_else(|| (")", span.hi()), |arg| (", ", arg.span.lo()));
let substs = self.infcx.resolve_vars_if_possible(substs);
self.update_infer_source(InferSource {
span: path.ident.span,
kind: InferSourceKind::FullyQualifiedMethodCall {
- receiver: args.first().unwrap(),
+ receiver,
successor,
substs,
def_id,
projects / rustc.git / blobdiff