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diagnostics: do not suggest static candidates as traits to import

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If it's a static candidate, then it's already implemented. Do not suggest
it a second time for implementing.
This commit is contained in:
Michael Howell 2022-10-25 14:46:14 -07:00
parent bed4ad65bf
commit b205a5a67c
1 changed files with 18 additions and 6 deletions
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24
compiler/rustc_hir_typeck/src/method/suggest.rs
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@ -106,7 +106,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
let report_candidates = |span: Span,
err: &mut Diagnostic,
mut sources: Vec<CandidateSource>,
sources: &mut Vec<CandidateSource>,
sugg_span: Span| {
sources.sort();
sources.dedup();
@ -248,7 +248,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
match error {
MethodError::NoMatch(NoMatchData {
static_candidates: static_sources,
static_candidates: mut static_sources,
unsatisfied_predicates,
out_of_scope_traits,
lev_candidate,
@ -422,9 +422,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
err.help(&format!("try with `{}::{}`", ty_str, item_name,));
}
report_candidates(span, &mut err, static_sources, sugg_span);
report_candidates(span, &mut err, &mut static_sources, sugg_span);
} else if static_sources.len() > 1 {
report_candidates(span, &mut err, static_sources, sugg_span);
report_candidates(span, &mut err, &mut static_sources, sugg_span);
}
let mut bound_spans = vec![];
@ -1007,6 +1007,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
source,
out_of_scope_traits,
&unsatisfied_predicates,
&static_sources,
unsatisfied_bounds,
);
}
@ -1079,7 +1080,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
return Some(err);
}
MethodError::Ambiguity(sources) => {
MethodError::Ambiguity(mut sources) => {
let mut err = struct_span_err!(
self.sess(),
item_name.span,
@ -1088,7 +1089,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
);
err.span_label(item_name.span, format!("multiple `{}` found", item_name));
report_candidates(span, &mut err, sources, sugg_span);
report_candidates(span, &mut err, &mut sources, sugg_span);
err.emit();
}
@ -2015,6 +2016,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
Option<ty::Predicate<'tcx>>,
Option<ObligationCause<'tcx>>,
)],
static_candidates: &[CandidateSource],
unsatisfied_bounds: bool,
) {
let mut alt_rcvr_sugg = false;
@ -2128,6 +2130,16 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
Some(attr) => attr.level.is_stable(),
None => true,
})
.filter(|info| {
// Static candidates are already implemented, and known not to work
// Do not suggest them again
static_candidates.iter().all(|sc| match *sc {
CandidateSource::Trait(def_id) => def_id != info.def_id,
CandidateSource::Impl(def_id) => {
self.tcx.trait_id_of_impl(def_id) != Some(info.def_id)
}
})
})
.filter(|info| {
// We approximate the coherence rules to only suggest
// traits that are legal to implement by requiring that