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Fix ICE caused by suggestion with no code substitutions

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Change suggestion logic to filter and checking _before_ creating
specific resolution suggestion.

Assert earlier that suggestions contain code substitions to make it
easier in the future to debug invalid uses. If we find this becomes too
noisy in the wild, we can always make the emitter resilient to these
cases and remove the assertions.

Fix #78651.
This commit is contained in:
Esteban Küber 2021-02-13 19:52:12 -08:00
parent 178108bf81
commit 04c2454b1e
4 changed files with 39 additions and 20 deletions
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28
compiler/rustc_resolve/src/late/diagnostics.rs
View file

@ -319,9 +319,13 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
.collect::<Vec<_>>();
let crate_def_id = DefId::local(CRATE_DEF_INDEX);
if candidates.is_empty() && is_expected(Res::Def(DefKind::Enum, crate_def_id)) {
let enum_candidates =
self.r.lookup_import_candidates(ident, ns, &self.parent_scope, is_enum_variant);
let mut enum_candidates: Vec<_> = self
.r
.lookup_import_candidates(ident, ns, &self.parent_scope, is_enum_variant)
.into_iter()
.map(|suggestion| import_candidate_to_enum_paths(&suggestion))
.filter(|(_, enum_ty_path)| enum_ty_path != "std::prelude::v1")
.collect();
if !enum_candidates.is_empty() {
if let (PathSource::Type, Some(span)) =
(source, self.diagnostic_metadata.current_type_ascription.last())
@ -340,10 +344,6 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
}
}
let mut enum_candidates = enum_candidates
.iter()
.map(|suggestion| import_candidate_to_enum_paths(&suggestion))
.collect::<Vec<_>>();
enum_candidates.sort();
// Contextualize for E0412 "cannot find type", but don't belabor the point
@ -363,19 +363,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
err.span_suggestions(
span,
&msg,
enum_candidates
.into_iter()
.map(|(_variant_path, enum_ty_path)| enum_ty_path)
// Variants re-exported in prelude doesn't mean `prelude::v1` is the
// type name!
// FIXME: is there a more principled way to do this that
// would work for other re-exports?
.filter(|enum_ty_path| enum_ty_path != "std::prelude::v1")
// Also write `Option` rather than `std::prelude::v1::Option`.
.map(|enum_ty_path| {
// FIXME #56861: DRY-er prelude filtering.
enum_ty_path.trim_start_matches("std::prelude::v1::").to_owned()
}),
enum_candidates.into_iter().map(|(_variant_path, enum_ty_path)| enum_ty_path),
Applicability::MachineApplicable,
);
}