use crate::FnCtxt;
use rustc_ast::ast::Mutability;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
+use rustc_errors::StashKey;
use rustc_errors::{
pluralize, struct_span_err, Applicability, Diagnostic, DiagnosticBuilder, ErrorGuaranteed,
MultiSpan,
use rustc_hir::def::DefKind;
use rustc_hir::def_id::DefId;
use rustc_hir::lang_items::LangItem;
+use rustc_hir::PatKind::Binding;
+use rustc_hir::PathSegment;
use rustc_hir::{ExprKind, Node, QPath};
use rustc_infer::infer::{
type_variable::{TypeVariableOrigin, TypeVariableOriginKind},
FulfillmentError, Obligation, ObligationCause, ObligationCauseCode,
};
-use std::cmp::Ordering;
-use std::iter;
-
use super::probe::{AutorefOrPtrAdjustment, IsSuggestion, Mode, ProbeScope};
use super::{CandidateSource, MethodError, NoMatchData};
+use rustc_hir::intravisit::Visitor;
+use std::cmp::Ordering;
+use std::iter;
impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
fn is_fn_ty(&self, ty: Ty<'tcx>, span: Span) -> bool {
let mut unimplemented_traits = FxHashMap::default();
let mut unimplemented_traits_only = true;
for (predicate, _parent_pred, cause) in &unsatisfied_predicates {
- if let (ty::PredicateKind::Trait(p), Some(cause)) =
+ if let (ty::PredicateKind::Clause(ty::Clause::Trait(p)), Some(cause)) =
(predicate.kind().skip_binder(), cause.as_ref())
{
if p.trait_ref.self_ty() != rcvr_ty {
// because of some non-Clone item being iterated over.
for (predicate, _parent_pred, _cause) in &unsatisfied_predicates {
match predicate.kind().skip_binder() {
- ty::PredicateKind::Trait(p)
+ ty::PredicateKind::Clause(ty::Clause::Trait(p))
if unimplemented_traits.contains_key(&p.trait_ref.def_id) => {}
_ => {
unimplemented_traits_only = false;
let mut collect_type_param_suggestions =
|self_ty: Ty<'tcx>, parent_pred: ty::Predicate<'tcx>, obligation: &str| {
// We don't care about regions here, so it's fine to skip the binder here.
- if let (ty::Param(_), ty::PredicateKind::Trait(p)) =
+ if let (ty::Param(_), ty::PredicateKind::Clause(ty::Clause::Trait(p))) =
(self_ty.kind(), parent_pred.kind().skip_binder())
{
let hir = self.tcx.hir();
let mut format_pred = |pred: ty::Predicate<'tcx>| {
let bound_predicate = pred.kind();
match bound_predicate.skip_binder() {
- ty::PredicateKind::Projection(pred) => {
+ ty::PredicateKind::Clause(ty::Clause::Projection(pred)) => {
let pred = bound_predicate.rebind(pred);
// `<Foo as Iterator>::Item = String`.
let projection_ty = pred.skip_binder().projection_ty;
bound_span_label(projection_ty.self_ty(), &obligation, &quiet);
Some((obligation, projection_ty.self_ty()))
}
- ty::PredicateKind::Trait(poly_trait_ref) => {
+ ty::PredicateKind::Clause(ty::Clause::Trait(poly_trait_ref)) => {
let p = poly_trait_ref.trait_ref;
let self_ty = p.self_ty();
let path = p.print_only_trait_path();
let sized_pred =
unsatisfied_predicates.iter().any(|(pred, _, _)| {
match pred.kind().skip_binder() {
- ty::PredicateKind::Trait(pred) => {
+ ty::PredicateKind::Clause(ty::Clause::Trait(pred)) => {
Some(pred.def_id())
== self.tcx.lang_items().sized_trait()
&& pred.polarity == ty::ImplPolarity::Positive
&& assoc.kind == ty::AssocKind::Fn
{
let sig = self.tcx.fn_sig(assoc.def_id);
- if let Some(first) = sig.inputs().skip_binder().get(0) {
- if first.peel_refs() == rcvr_ty.peel_refs() {
- None
- } else {
- Some(if first.is_region_ptr() {
- if first.is_mutable_ptr() { "&mut " } else { "&" }
- } else {
- ""
- })
- }
- } else {
+ sig.inputs().skip_binder().get(0).and_then(|first| if first.peel_refs() == rcvr_ty.peel_refs() {
None
- }
+ } else {
+ Some(first.ref_mutability().map_or("", |mutbl| mutbl.ref_prefix_str()))
+ })
} else {
None
};
false
}
+ /// For code `rect::area(...)`,
+ /// if `rect` is a local variable and `area` is a valid assoc method for it,
+ /// we try to suggest `rect.area()`
+ pub(crate) fn suggest_assoc_method_call(&self, segs: &[PathSegment<'_>]) {
+ debug!("suggest_assoc_method_call segs: {:?}", segs);
+ let [seg1, seg2] = segs else { return; };
+ let Some(mut diag) =
+ self.tcx.sess.diagnostic().steal_diagnostic(seg1.ident.span, StashKey::CallAssocMethod)
+ else { return };
+
+ let map = self.infcx.tcx.hir();
+ let body = map.body(rustc_hir::BodyId { hir_id: self.body_id });
+ struct LetVisitor<'a> {
+ result: Option<&'a hir::Expr<'a>>,
+ ident_name: Symbol,
+ }
+
+ impl<'v> Visitor<'v> for LetVisitor<'v> {
+ fn visit_stmt(&mut self, ex: &'v hir::Stmt<'v>) {
+ if let hir::StmtKind::Local(hir::Local { pat, init, .. }) = &ex.kind {
+ if let Binding(_, _, ident, ..) = pat.kind &&
+ ident.name == self.ident_name {
+ self.result = *init;
+ }
+ }
+ hir::intravisit::walk_stmt(self, ex);
+ }
+ }
+
+ let mut visitor = LetVisitor { result: None, ident_name: seg1.ident.name };
+ visitor.visit_body(&body);
+
+ let parent = self.tcx.hir().get_parent_node(seg1.hir_id);
+ if let Some(Node::Expr(call_expr)) = self.tcx.hir().find(parent) &&
+ let Some(expr) = visitor.result {
+ let self_ty = self.node_ty(expr.hir_id);
+ let probe = self.lookup_probe(
+ seg2.ident,
+ self_ty,
+ call_expr,
+ ProbeScope::TraitsInScope,
+ );
+ if probe.is_ok() {
+ let sm = self.infcx.tcx.sess.source_map();
+ diag.span_suggestion_verbose(
+ sm.span_extend_while(seg1.ident.span.shrink_to_hi(), |c| c == ':').unwrap(),
+ "you may have meant to call an instance method",
+ ".".to_string(),
+ Applicability::MaybeIncorrect
+ );
+ }
+ }
+ diag.emit();
+ }
+
/// Suggest calling a method on a field i.e. `a.field.bar()` instead of `a.bar()`
fn suggest_calling_method_on_field(
&self,
) {
let all_local_types_needing_impls =
errors.iter().all(|e| match e.obligation.predicate.kind().skip_binder() {
- ty::PredicateKind::Trait(pred) => match pred.self_ty().kind() {
+ ty::PredicateKind::Clause(ty::Clause::Trait(pred)) => match pred.self_ty().kind() {
ty::Adt(def, _) => def.did().is_local(),
_ => false,
},
let mut preds: Vec<_> = errors
.iter()
.filter_map(|e| match e.obligation.predicate.kind().skip_binder() {
- ty::PredicateKind::Trait(pred) => Some(pred),
+ ty::PredicateKind::Clause(ty::Clause::Trait(pred)) => Some(pred),
_ => None,
})
.collect();
let mut derives = Vec::<(String, Span, Symbol)>::new();
let mut traits = Vec::<Span>::new();
for (pred, _, _) in unsatisfied_predicates {
- let ty::PredicateKind::Trait(trait_pred) = pred.kind().skip_binder() else { continue };
+ let ty::PredicateKind::Clause(ty::Clause::Trait(trait_pred)) = pred.kind().skip_binder() else { continue };
let adt = match trait_pred.self_ty().ty_adt_def() {
Some(adt) if adt.did().is_local() => adt,
_ => continue,
span: Span,
) {
let output_ty = match self.get_impl_future_output_ty(ty) {
- Some(output_ty) => self.resolve_vars_if_possible(output_ty).skip_binder(),
+ Some(output_ty) => self.resolve_vars_if_possible(output_ty),
_ => return,
};
let method_exists = self.method_exists(item_name, output_ty, call.hir_id, true);
match p.kind().skip_binder() {
// Hide traits if they are present in predicates as they can be fixed without
// having to implement them.
- ty::PredicateKind::Trait(t) => t.def_id() == info.def_id,
- ty::PredicateKind::Projection(p) => {
+ ty::PredicateKind::Clause(ty::Clause::Trait(t)) => {
+ t.def_id() == info.def_id
+ }
+ ty::PredicateKind::Clause(ty::Clause::Projection(p)) => {
p.projection_ty.item_def_id == info.def_id
}
_ => false,
let (span, sugg) = if let (ty::AssocKind::Fn, Some((receiver, args))) = (kind, args) {
let args = format!(
"({}{})",
- if rcvr_ty.is_region_ptr() {
- if rcvr_ty.is_mutable_ptr() { "&mut " } else { "&" }
- } else {
- ""
- },
+ rcvr_ty.ref_mutability().map_or("", |mutbl| mutbl.ref_prefix_str()),
std::iter::once(receiver)
.chain(args.iter())
.map(|arg| source_map.span_to_snippet(arg.span).unwrap_or_else(|_| {
projects / rust.git / blobdiff