bjoernager/rust
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Create helper maybe_report_similar_assoc_fn

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This commit is contained in:
trevyn 2024-02-05 18:53:28 -08:00
parent a4cb55f2ac
commit 0b6af718d8
4 changed files with 66 additions and 65 deletions
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51
compiler/rustc_hir_analysis/src/astconv/errors.rs
View file

@ -14,6 +14,7 @@ use rustc_errors::{
use rustc_hir as hir;
use rustc_hir::def_id::{DefId, LocalDefId};
use rustc_infer::traits::FulfillmentError;
use rustc_middle::query::Key;
use rustc_middle::ty::{self, suggest_constraining_type_param, Ty, TyCtxt, TypeVisitableExt};
use rustc_session::parse::feature_err;
use rustc_span::edit_distance::find_best_match_for_name;
@ -859,6 +860,56 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
self.set_tainted_by_errors(err.emit());
}
/// On ambiguous associated type, look for an associated function whose name matches the
/// extended path and, if found, emit an E0223 error with a structured suggestion.
/// e.g. for `String::from::utf8`, suggest `String::from_utf8` (#109195)
pub(crate) fn maybe_report_similar_assoc_fn(
&self,
span: Span,
qself_ty: Ty<'tcx>,
qself: &hir::Ty<'_>,
) -> Result<(), ErrorGuaranteed> {
let tcx = self.tcx();
if let Some((_, node)) = tcx.hir().parent_iter(qself.hir_id).skip(1).next()
&& let hir::Node::Expr(hir::Expr {
kind:
hir::ExprKind::Path(hir::QPath::TypeRelative(
hir::Ty {
kind:
hir::TyKind::Path(hir::QPath::TypeRelative(
_,
hir::PathSegment { ident: ident2, .. },
)),
..
},
hir::PathSegment { ident: ident3, .. },
)),
..
}) = node
&& let Some(ty_def_id) = qself_ty.ty_def_id()
&& let Ok([inherent_impl]) = tcx.inherent_impls(ty_def_id)
&& let name = format!("{ident2}_{ident3}")
&& let Some(ty::AssocItem { kind: ty::AssocKind::Fn, .. }) = tcx
.associated_items(inherent_impl)
.filter_by_name_unhygienic(Symbol::intern(&name))
.next()
{
let reported =
struct_span_code_err!(tcx.dcx(), span, E0223, "ambiguous associated type")
.with_span_suggestion_verbose(
ident2.span.to(ident3.span),
format!("there is an associated function with a similar name: `{name}`"),
name,
Applicability::MaybeIncorrect,
)
.emit();
self.set_tainted_by_errors(reported);
Err(reported)
} else {
Ok(())
}
}
}
/// Emits an error regarding forbidden type binding associations

52
compiler/rustc_hir_analysis/src/astconv/mod.rs
View file

@ -29,7 +29,6 @@ use rustc_hir::{GenericArg, GenericArgs, OpaqueTyOrigin};
use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
use rustc_infer::traits::ObligationCause;
use rustc_middle::middle::stability::AllowUnstable;
use rustc_middle::query::Key;
use rustc_middle::ty::{
self, Const, GenericArgKind, GenericArgsRef, GenericParamDefKind, IsSuggestable, ParamEnv, Ty,
TyCtxt, TypeVisitableExt,
@ -1374,56 +1373,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
)
.emit() // Already reported in an earlier stage.
} else {
// suggest methods that look similar to the path
// e.g. for `String::from::utf8`, suggest `String::from_utf8` (#109195)
for (_, node) in tcx.hir().parent_iter(qself.hir_id) {
if let hir::Node::Expr(hir::Expr {
kind:
hir::ExprKind::Path(hir::QPath::TypeRelative(
hir::Ty {
kind:
hir::TyKind::Path(hir::QPath::TypeRelative(
_,
hir::PathSegment { ident: ident2, .. },
)),
..
},
hir::PathSegment { ident: ident3, .. },
)),
..
}) = node
{
let name = format!("{ident2}_{ident3}");
if if let Some(ty_def_id) = qself_ty.ty_def_id()
&& let Ok([inherent_impl]) = tcx.inherent_impls(ty_def_id)
&& let Some(ty::AssocItem { kind: ty::AssocKind::Fn, .. }) = tcx
.associated_items(inherent_impl)
.filter_by_name_unhygienic(Symbol::intern(&name))
.next()
{
true
} else {
qself_ty.is_str()
&& ["from_utf8", "from_utf8_mut"].contains(&name.as_str())
} {
let reported = struct_span_code_err!(
tcx.dcx(),
span,
E0223,
"ambiguous associated type"
)
.with_span_suggestion_verbose(
ident2.span.to(ident3.span),
format!("you might have meant to use `{name}`"),
name,
Applicability::MaybeIncorrect,
)
.emit();
self.set_tainted_by_errors(reported);
return Err(reported);
}
}
}
self.maybe_report_similar_assoc_fn(span, qself_ty, qself)?;
let traits: Vec<_> =
self.probe_traits_that_match_assoc_ty(qself_ty, assoc_ident);