Addressed review points.
This commit is contained in:
Alexander Regueiro
parent
14b674ab9d
commit
497a772d04
@ -1,13 +1,420 @@
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use crate::{CrateLint, PathResult, Segment};
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use crate::macros::ParentScope;
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use crate::resolve_imports::ImportResolver;
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use std::cmp::Reverse;
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use log::debug;
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use rustc::hir::def::*;
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use rustc::hir::def::Namespace::*;
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use rustc::hir::def_id::{CRATE_DEF_INDEX, DefId};
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use rustc::session::config::nightly_options;
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use syntax::ast::{ExprKind};
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use syntax::symbol::keywords;
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use syntax_pos::Span;
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use log::debug;
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use crate::errors::{Applicability, DiagnosticBuilder, DiagnosticId};
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use crate::macros::ParentScope;
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use crate::resolve_imports::ImportResolver;
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use crate::{import_candidate_to_enum_paths, is_self_type, is_self_value, path_names_to_string};
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use crate::{AssocSuggestion, CrateLint, ImportSuggestion, ModuleOrUniformRoot, PathResult,
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PathSource, Resolver, Segment};
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use std::cmp::Reverse;
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impl<'a> Resolver<'a> {
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/// Handles error reporting for `smart_resolve_path_fragment` function.
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/// Creates base error and amends it with one short label and possibly some longer helps/notes.
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pub(crate) fn smart_resolve_report_errors(
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&mut self,
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path: &[Segment],
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span: Span,
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source: PathSource,
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def: Option<Def>,
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) -> (DiagnosticBuilder<'a>, Vec<ImportSuggestion>) {
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let ident_span = path.last().map_or(span, |ident| ident.ident.span);
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let ns = source.namespace();
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let is_expected = &|def| source.is_expected(def);
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let is_enum_variant = &|def| if let Def::Variant(..) = def { true } else { false };
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// Make the base error.
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let expected = source.descr_expected();
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let path_str = Segment::names_to_string(path);
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let item_str = path.last().unwrap().ident;
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let code = source.error_code(def.is_some());
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let (base_msg, fallback_label, base_span) = if let Some(def) = def {
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(format!("expected {}, found {} `{}`", expected, def.kind_name(), path_str),
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format!("not a {}", expected),
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span)
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} else {
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let item_span = path.last().unwrap().ident.span;
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let (mod_prefix, mod_str) = if path.len() == 1 {
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(String::new(), "this scope".to_string())
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} else if path.len() == 2 && path[0].ident.name == keywords::PathRoot.name() {
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(String::new(), "the crate root".to_string())
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} else {
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let mod_path = &path[..path.len() - 1];
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let mod_prefix = match self.resolve_path_without_parent_scope(
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mod_path, Some(TypeNS), false, span, CrateLint::No
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) {
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PathResult::Module(ModuleOrUniformRoot::Module(module)) =>
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module.def(),
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_ => None,
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}.map_or(String::new(), |def| format!("{} ", def.kind_name()));
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(mod_prefix, format!("`{}`", Segment::names_to_string(mod_path)))
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};
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(format!("cannot find {} `{}` in {}{}", expected, item_str, mod_prefix, mod_str),
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format!("not found in {}", mod_str),
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item_span)
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};
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let code = DiagnosticId::Error(code.into());
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let mut err = self.session.struct_span_err_with_code(base_span, &base_msg, code);
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// Emit help message for fake-self from other languages (e.g., `this` in Javascript).
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if ["this", "my"].contains(&&*item_str.as_str())
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&& self.self_value_is_available(path[0].ident.span, span) {
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err.span_suggestion(
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span,
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"did you mean",
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"self".to_string(),
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Applicability::MaybeIncorrect,
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);
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}
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// Emit special messages for unresolved `Self` and `self`.
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if is_self_type(path, ns) {
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__diagnostic_used!(E0411);
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err.code(DiagnosticId::Error("E0411".into()));
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err.span_label(span, format!("`Self` is only available in impls, traits, \
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and type definitions"));
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return (err, Vec::new());
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}
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if is_self_value(path, ns) {
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debug!("smart_resolve_path_fragment: E0424, source={:?}", source);
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__diagnostic_used!(E0424);
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err.code(DiagnosticId::Error("E0424".into()));
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err.span_label(span, match source {
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PathSource::Pat => {
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format!("`self` value is a keyword \
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and may not be bound to \
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variables or shadowed")
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}
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_ => {
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format!("`self` value is a keyword \
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only available in methods \
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with `self` parameter")
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}
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});
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return (err, Vec::new());
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}
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// Try to lookup name in more relaxed fashion for better error reporting.
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let ident = path.last().unwrap().ident;
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let candidates = self.lookup_import_candidates(ident, ns, is_expected);
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if candidates.is_empty() && is_expected(Def::Enum(DefId::local(CRATE_DEF_INDEX))) {
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let enum_candidates =
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self.lookup_import_candidates(ident, ns, is_enum_variant);
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let mut enum_candidates = enum_candidates.iter()
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.map(|suggestion| {
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import_candidate_to_enum_paths(&suggestion)
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}).collect::<Vec<_>>();
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enum_candidates.sort();
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if !enum_candidates.is_empty() {
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// Contextualize for E0412 "cannot find type", but don't belabor the point
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// (that it's a variant) for E0573 "expected type, found variant".
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let preamble = if def.is_none() {
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let others = match enum_candidates.len() {
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1 => String::new(),
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2 => " and 1 other".to_owned(),
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n => format!(" and {} others", n)
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};
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format!("there is an enum variant `{}`{}; ",
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enum_candidates[0].0, others)
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} else {
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String::new()
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};
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let msg = format!("{}try using the variant's enum", preamble);
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err.span_suggestions(
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span,
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&msg,
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enum_candidates.into_iter()
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.map(|(_variant_path, enum_ty_path)| enum_ty_path)
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// Variants re-exported in prelude doesn't mean `prelude::v1` is the
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// type name!
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// FIXME: is there a more principled way to do this that
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// would work for other re-exports?
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.filter(|enum_ty_path| enum_ty_path != "std::prelude::v1")
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// Also write `Option` rather than `std::prelude::v1::Option`.
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.map(|enum_ty_path| {
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// FIXME #56861: DRY-er prelude filtering.
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enum_ty_path.trim_start_matches("std::prelude::v1::").to_owned()
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}),
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Applicability::MachineApplicable,
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);
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}
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}
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if path.len() == 1 && self.self_type_is_available(span) {
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if let Some(candidate) = self.lookup_assoc_candidate(ident, ns, is_expected) {
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let self_is_available = self.self_value_is_available(path[0].ident.span, span);
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match candidate {
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AssocSuggestion::Field => {
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err.span_suggestion(
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span,
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"try",
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format!("self.{}", path_str),
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Applicability::MachineApplicable,
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);
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if !self_is_available {
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err.span_label(span, format!("`self` value is a keyword \
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only available in \
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methods with `self` parameter"));
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}
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}
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AssocSuggestion::MethodWithSelf if self_is_available => {
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err.span_suggestion(
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span,
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"try",
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format!("self.{}", path_str),
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Applicability::MachineApplicable,
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);
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}
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AssocSuggestion::MethodWithSelf | AssocSuggestion::AssocItem => {
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err.span_suggestion(
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span,
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"try",
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format!("Self::{}", path_str),
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Applicability::MachineApplicable,
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);
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}
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}
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return (err, candidates);
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}
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}
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let mut levenshtein_worked = false;
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// Try Levenshtein algorithm.
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let suggestion = self.lookup_typo_candidate(path, ns, is_expected, span);
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if let Some(suggestion) = suggestion {
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let msg = format!(
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"{} {} with a similar name exists",
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suggestion.article, suggestion.kind
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);
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err.span_suggestion(
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ident_span,
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&msg,
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suggestion.candidate.to_string(),
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Applicability::MaybeIncorrect,
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);
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levenshtein_worked = true;
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}
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// Try context-dependent help if relaxed lookup didn't work.
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if let Some(def) = def {
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if self.smart_resolve_context_dependent_help(&mut err,
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span,
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source,
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def,
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&path_str,
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&fallback_label) {
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return (err, candidates);
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}
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}
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// Fallback label.
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if !levenshtein_worked {
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err.span_label(base_span, fallback_label);
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self.type_ascription_suggestion(&mut err, base_span);
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}
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(err, candidates)
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}
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/// Provides context-dependent help for errors reported by the `smart_resolve_path_fragment`
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/// function.
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/// Returns `true` if able to provide context-dependent help.
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fn smart_resolve_context_dependent_help(
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&mut self,
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err: &mut DiagnosticBuilder<'a>,
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span: Span,
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source: PathSource,
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def: Def,
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path_str: &str,
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fallback_label: &str,
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) -> bool {
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let ns = source.namespace();
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let is_expected = &|def| source.is_expected(def);
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match (def, source) {
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(Def::Macro(..), _) => {
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err.span_suggestion(
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span,
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"use `!` to invoke the macro",
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format!("{}!", path_str),
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Applicability::MaybeIncorrect,
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);
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}
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(Def::TyAlias(..), PathSource::Trait(_)) => {
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err.span_label(span, "type aliases cannot be used as traits");
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if nightly_options::is_nightly_build() {
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err.note("did you mean to use a trait alias?");
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}
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}
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(Def::Mod(..), PathSource::Expr(Some(parent))) => match parent.node {
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ExprKind::Field(_, ident) => {
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err.span_suggestion(
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parent.span,
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"use the path separator to refer to an item",
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format!("{}::{}", path_str, ident),
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Applicability::MaybeIncorrect,
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);
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}
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ExprKind::MethodCall(ref segment, ..) => {
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let span = parent.span.with_hi(segment.ident.span.hi());
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err.span_suggestion(
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span,
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"use the path separator to refer to an item",
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format!("{}::{}", path_str, segment.ident),
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Applicability::MaybeIncorrect,
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);
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}
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_ => return false,
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},
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(Def::Enum(..), PathSource::TupleStruct)
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| (Def::Enum(..), PathSource::Expr(..)) => {
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if let Some(variants) = self.collect_enum_variants(def) {
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err.note(&format!("did you mean to use one \
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of the following variants?\n{}",
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variants.iter()
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.map(|suggestion| path_names_to_string(suggestion))
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.map(|suggestion| format!("- `{}`", suggestion))
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.collect::<Vec<_>>()
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.join("\n")));
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} else {
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err.note("did you mean to use one of the enum's variants?");
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}
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},
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(Def::Struct(def_id), _) if ns == ValueNS => {
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if let Some((ctor_def, ctor_vis))
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= self.struct_constructors.get(&def_id).cloned() {
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let accessible_ctor = self.is_accessible(ctor_vis);
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if is_expected(ctor_def) && !accessible_ctor {
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err.span_label(span, format!("constructor is not visible \
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here due to private fields"));
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}
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} else {
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// HACK(estebank): find a better way to figure out that this was a
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// parser issue where a struct literal is being used on an expression
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// where a brace being opened means a block is being started. Look
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// ahead for the next text to see if `span` is followed by a `{`.
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let sm = self.session.source_map();
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let mut sp = span;
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loop {
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sp = sm.next_point(sp);
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match sm.span_to_snippet(sp) {
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Ok(ref snippet) => {
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if snippet.chars().any(|c| { !c.is_whitespace() }) {
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break;
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}
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}
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_ => break,
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}
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}
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let followed_by_brace = match sm.span_to_snippet(sp) {
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Ok(ref snippet) if snippet == "{" => true,
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_ => false,
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};
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// In case this could be a struct literal that needs to be surrounded
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// by parenthesis, find the appropriate span.
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let mut i = 0;
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let mut closing_brace = None;
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loop {
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sp = sm.next_point(sp);
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match sm.span_to_snippet(sp) {
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Ok(ref snippet) => {
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if snippet == "}" {
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let sp = span.to(sp);
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if let Ok(snippet) = sm.span_to_snippet(sp) {
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closing_brace = Some((sp, snippet));
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}
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break;
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}
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}
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_ => break,
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}
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i += 1;
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// The bigger the span, the more likely we're incorrect --
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// bound it to 100 chars long.
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if i > 100 {
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break;
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}
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}
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match source {
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PathSource::Expr(Some(parent)) => {
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match parent.node {
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ExprKind::MethodCall(ref path_assignment, _) => {
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err.span_suggestion(
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sm.start_point(parent.span)
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.to(path_assignment.ident.span),
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"use `::` to access an associated function",
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format!("{}::{}",
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path_str,
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path_assignment.ident),
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Applicability::MaybeIncorrect
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);
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},
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_ => {
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err.span_label(
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span,
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format!("did you mean `{} {{ /* fields */ }}`?",
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path_str),
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);
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},
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}
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},
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PathSource::Expr(None) if followed_by_brace == true => {
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if let Some((sp, snippet)) = closing_brace {
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err.span_suggestion(
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sp,
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"surround the struct literal with parenthesis",
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format!("({})", snippet),
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Applicability::MaybeIncorrect,
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);
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} else {
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err.span_label(
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span,
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format!("did you mean `({} {{ /* fields */ }})`?",
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path_str),
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);
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}
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},
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_ => {
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err.span_label(
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span,
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format!("did you mean `{} {{ /* fields */ }}`?",
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path_str),
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);
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},
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}
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}
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}
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(Def::Union(..), _) |
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(Def::Variant(..), _) |
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(Def::VariantCtor(_, CtorKind::Fictive), _) if ns == ValueNS => {
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err.span_label(span, format!("did you mean `{} {{ /* fields */ }}`?",
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path_str));
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}
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(Def::SelfTy(..), _) if ns == ValueNS => {
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err.span_label(span, fallback_label);
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err.note("can't use `Self` as a constructor, you must use the \
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implemented struct");
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}
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(Def::TyAlias(_), _) | (Def::AssociatedTy(..), _) if ns == ValueNS => {
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err.note("can't use a type alias as a constructor");
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}
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_ => return false,
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}
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true
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}
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}
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impl<'a, 'b:'a> ImportResolver<'a, 'b> {
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/// Add suggestions for a path that cannot be resolved.
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@ -25,7 +25,6 @@
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use rustc::hir::def::Namespace::*;
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use rustc::hir::def_id::{CRATE_DEF_INDEX, LOCAL_CRATE, DefId};
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use rustc::hir::{Freevar, FreevarMap, TraitCandidate, TraitMap, GlobMap};
|
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use rustc::session::config::nightly_options;
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use rustc::ty;
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use rustc::util::nodemap::{NodeMap, NodeSet, FxHashMap, FxHashSet, DefIdMap};
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use rustc::{bug, span_bug};
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@ -3124,404 +3123,6 @@ fn smart_resolve_path_with_crate_lint(
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)
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}
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|
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/// Provides context-dependent help for errors reported by the `smart_resolve_path_fragment`
|
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/// function.
|
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/// Returns `true` if able to provide context-dependent help.
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fn smart_resolve_context_dep_help(
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&mut self,
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err: &mut DiagnosticBuilder<'a>,
|
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span: Span,
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source: PathSource,
|
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def: Def,
|
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path_str: &str,
|
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fallback_label: &str,
|
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) -> bool {
|
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let ns = source.namespace();
|
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let is_expected = &|def| source.is_expected(def);
|
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|
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match (def, source) {
|
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(Def::Macro(..), _) => {
|
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err.span_suggestion(
|
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span,
|
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"use `!` to invoke the macro",
|
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format!("{}!", path_str),
|
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Applicability::MaybeIncorrect,
|
||||
);
|
||||
}
|
||||
(Def::TyAlias(..), PathSource::Trait(_)) => {
|
||||
err.span_label(span, "type aliases cannot be used as traits");
|
||||
if nightly_options::is_nightly_build() {
|
||||
err.note("did you mean to use a trait alias?");
|
||||
}
|
||||
}
|
||||
(Def::Mod(..), PathSource::Expr(Some(parent))) => match parent.node {
|
||||
ExprKind::Field(_, ident) => {
|
||||
err.span_suggestion(
|
||||
parent.span,
|
||||
"use the path separator to refer to an item",
|
||||
format!("{}::{}", path_str, ident),
|
||||
Applicability::MaybeIncorrect,
|
||||
);
|
||||
}
|
||||
ExprKind::MethodCall(ref segment, ..) => {
|
||||
let span = parent.span.with_hi(segment.ident.span.hi());
|
||||
err.span_suggestion(
|
||||
span,
|
||||
"use the path separator to refer to an item",
|
||||
format!("{}::{}", path_str, segment.ident),
|
||||
Applicability::MaybeIncorrect,
|
||||
);
|
||||
}
|
||||
_ => return false,
|
||||
},
|
||||
(Def::Enum(..), PathSource::TupleStruct)
|
||||
| (Def::Enum(..), PathSource::Expr(..)) => {
|
||||
if let Some(variants) = self.collect_enum_variants(def) {
|
||||
err.note(&format!("did you mean to use one \
|
||||
of the following variants?\n{}",
|
||||
variants.iter()
|
||||
.map(|suggestion| path_names_to_string(suggestion))
|
||||
.map(|suggestion| format!("- `{}`", suggestion))
|
||||
.collect::<Vec<_>>()
|
||||
.join("\n")));
|
||||
} else {
|
||||
err.note("did you mean to use one of the enum's variants?");
|
||||
}
|
||||
},
|
||||
(Def::Struct(def_id), _) if ns == ValueNS => {
|
||||
if let Some((ctor_def, ctor_vis))
|
||||
= self.struct_constructors.get(&def_id).cloned() {
|
||||
let accessible_ctor = self.is_accessible(ctor_vis);
|
||||
if is_expected(ctor_def) && !accessible_ctor {
|
||||
err.span_label(span, format!("constructor is not visible \
|
||||
here due to private fields"));
|
||||
}
|
||||
} else {
|
||||
// HACK(estebank): find a better way to figure out that this was a
|
||||
// parser issue where a struct literal is being used on an expression
|
||||
// where a brace being opened means a block is being started. Look
|
||||
// ahead for the next text to see if `span` is followed by a `{`.
|
||||
let sm = self.session.source_map();
|
||||
let mut sp = span;
|
||||
loop {
|
||||
sp = sm.next_point(sp);
|
||||
match sm.span_to_snippet(sp) {
|
||||
Ok(ref snippet) => {
|
||||
if snippet.chars().any(|c| { !c.is_whitespace() }) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
_ => break,
|
||||
}
|
||||
}
|
||||
let followed_by_brace = match sm.span_to_snippet(sp) {
|
||||
Ok(ref snippet) if snippet == "{" => true,
|
||||
_ => false,
|
||||
};
|
||||
// In case this could be a struct literal that needs to be surrounded
|
||||
// by parenthesis, find the appropriate span.
|
||||
let mut i = 0;
|
||||
let mut closing_brace = None;
|
||||
loop {
|
||||
sp = sm.next_point(sp);
|
||||
match sm.span_to_snippet(sp) {
|
||||
Ok(ref snippet) => {
|
||||
if snippet == "}" {
|
||||
let sp = span.to(sp);
|
||||
if let Ok(snippet) = sm.span_to_snippet(sp) {
|
||||
closing_brace = Some((sp, snippet));
|
||||
}
|
||||
break;
|
||||
}
|
||||
}
|
||||
_ => break,
|
||||
}
|
||||
i += 1;
|
||||
// The bigger the span, the more likely we're incorrect --
|
||||
// bound it to 100 chars long.
|
||||
if i > 100 {
|
||||
break;
|
||||
}
|
||||
}
|
||||
match source {
|
||||
PathSource::Expr(Some(parent)) => {
|
||||
match parent.node {
|
||||
ExprKind::MethodCall(ref path_assignment, _) => {
|
||||
err.span_suggestion(
|
||||
sm.start_point(parent.span)
|
||||
.to(path_assignment.ident.span),
|
||||
"use `::` to access an associated function",
|
||||
format!("{}::{}",
|
||||
path_str,
|
||||
path_assignment.ident),
|
||||
Applicability::MaybeIncorrect
|
||||
);
|
||||
},
|
||||
_ => {
|
||||
err.span_label(
|
||||
span,
|
||||
format!("did you mean `{} {{ /* fields */ }}`?",
|
||||
path_str),
|
||||
);
|
||||
},
|
||||
}
|
||||
},
|
||||
PathSource::Expr(None) if followed_by_brace == true => {
|
||||
if let Some((sp, snippet)) = closing_brace {
|
||||
err.span_suggestion(
|
||||
sp,
|
||||
"surround the struct literal with parenthesis",
|
||||
format!("({})", snippet),
|
||||
Applicability::MaybeIncorrect,
|
||||
);
|
||||
} else {
|
||||
err.span_label(
|
||||
span,
|
||||
format!("did you mean `({} {{ /* fields */ }})`?",
|
||||
path_str),
|
||||
);
|
||||
}
|
||||
},
|
||||
_ => {
|
||||
err.span_label(
|
||||
span,
|
||||
format!("did you mean `{} {{ /* fields */ }}`?",
|
||||
path_str),
|
||||
);
|
||||
},
|
||||
}
|
||||
}
|
||||
}
|
||||
(Def::Union(..), _) |
|
||||
(Def::Variant(..), _) |
|
||||
(Def::VariantCtor(_, CtorKind::Fictive), _) if ns == ValueNS => {
|
||||
err.span_label(span, format!("did you mean `{} {{ /* fields */ }}`?",
|
||||
path_str));
|
||||
}
|
||||
(Def::SelfTy(..), _) if ns == ValueNS => {
|
||||
err.span_label(span, fallback_label);
|
||||
err.note("can't use `Self` as a constructor, you must use the \
|
||||
implemented struct");
|
||||
}
|
||||
(Def::TyAlias(_), _) | (Def::AssociatedTy(..), _) if ns == ValueNS => {
|
||||
err.note("can't use a type alias as a constructor");
|
||||
}
|
||||
_ => return false,
|
||||
}
|
||||
true
|
||||
}
|
||||
|
||||
/// Handles error reporting for `smart_resolve_path_fragment` function.
|
||||
/// Creates base error and amends it with one short label and possibly some longer helps/notes.
|
||||
fn smart_resolve_report_errors(
|
||||
&mut self,
|
||||
path: &[Segment],
|
||||
span: Span,
|
||||
source: PathSource<'_>,
|
||||
def: Option<Def>,
|
||||
) -> (DiagnosticBuilder<'a>, Vec<ImportSuggestion>) {
|
||||
let ident_span = path.last().map_or(span, |ident| ident.ident.span);
|
||||
let ns = source.namespace();
|
||||
let is_expected = &|def| source.is_expected(def);
|
||||
let is_enum_variant = &|def| if let Def::Variant(..) = def { true } else { false };
|
||||
|
||||
// Make the base error.
|
||||
let expected = source.descr_expected();
|
||||
let path_str = Segment::names_to_string(path);
|
||||
let item_str = path.last().unwrap().ident;
|
||||
let code = source.error_code(def.is_some());
|
||||
let (base_msg, fallback_label, base_span) = if let Some(def) = def {
|
||||
(format!("expected {}, found {} `{}`", expected, def.kind_name(), path_str),
|
||||
format!("not a {}", expected),
|
||||
span)
|
||||
} else {
|
||||
let item_span = path.last().unwrap().ident.span;
|
||||
let (mod_prefix, mod_str) = if path.len() == 1 {
|
||||
(String::new(), "this scope".to_string())
|
||||
} else if path.len() == 2 && path[0].ident.name == keywords::PathRoot.name() {
|
||||
(String::new(), "the crate root".to_string())
|
||||
} else {
|
||||
let mod_path = &path[..path.len() - 1];
|
||||
let mod_prefix = match self.resolve_path_without_parent_scope(
|
||||
mod_path, Some(TypeNS), false, span, CrateLint::No
|
||||
) {
|
||||
PathResult::Module(ModuleOrUniformRoot::Module(module)) =>
|
||||
module.def(),
|
||||
_ => None,
|
||||
}.map_or(String::new(), |def| format!("{} ", def.kind_name()));
|
||||
(mod_prefix, format!("`{}`", Segment::names_to_string(mod_path)))
|
||||
};
|
||||
(format!("cannot find {} `{}` in {}{}", expected, item_str, mod_prefix, mod_str),
|
||||
format!("not found in {}", mod_str),
|
||||
item_span)
|
||||
};
|
||||
|
||||
let code = DiagnosticId::Error(code.into());
|
||||
let mut err = self.session.struct_span_err_with_code(base_span, &base_msg, code);
|
||||
|
||||
// Emit help message for fake-self from other languages (e.g., `this` in Javascript).
|
||||
if ["this", "my"].contains(&&*item_str.as_str())
|
||||
&& self.self_value_is_available(path[0].ident.span, span) {
|
||||
err.span_suggestion(
|
||||
span,
|
||||
"did you mean",
|
||||
"self".to_string(),
|
||||
Applicability::MaybeIncorrect,
|
||||
);
|
||||
}
|
||||
|
||||
// Emit special messages for unresolved `Self` and `self`.
|
||||
if is_self_type(path, ns) {
|
||||
__diagnostic_used!(E0411);
|
||||
err.code(DiagnosticId::Error("E0411".into()));
|
||||
err.span_label(span, format!("`Self` is only available in impls, traits, \
|
||||
and type definitions"));
|
||||
return (err, Vec::new());
|
||||
}
|
||||
if is_self_value(path, ns) {
|
||||
debug!("smart_resolve_path_fragment: E0424, source={:?}", source);
|
||||
|
||||
__diagnostic_used!(E0424);
|
||||
err.code(DiagnosticId::Error("E0424".into()));
|
||||
err.span_label(span, match source {
|
||||
PathSource::Pat => {
|
||||
format!("`self` value is a keyword \
|
||||
and may not be bound to \
|
||||
variables or shadowed")
|
||||
}
|
||||
_ => {
|
||||
format!("`self` value is a keyword \
|
||||
only available in methods \
|
||||
with `self` parameter")
|
||||
}
|
||||
});
|
||||
return (err, Vec::new());
|
||||
}
|
||||
|
||||
// Try to lookup name in more relaxed fashion for better error reporting.
|
||||
let ident = path.last().unwrap().ident;
|
||||
let candidates = self.lookup_import_candidates(ident, ns, is_expected);
|
||||
if candidates.is_empty() && is_expected(Def::Enum(DefId::local(CRATE_DEF_INDEX))) {
|
||||
let enum_candidates =
|
||||
self.lookup_import_candidates(ident, ns, is_enum_variant);
|
||||
let mut enum_candidates = enum_candidates.iter()
|
||||
.map(|suggestion| {
|
||||
import_candidate_to_enum_paths(&suggestion)
|
||||
}).collect::<Vec<_>>();
|
||||
enum_candidates.sort();
|
||||
|
||||
if !enum_candidates.is_empty() {
|
||||
// Contextualize for E0412 "cannot find type", but don't belabor the point
|
||||
// (that it's a variant) for E0573 "expected type, found variant".
|
||||
let preamble = if def.is_none() {
|
||||
let others = match enum_candidates.len() {
|
||||
1 => String::new(),
|
||||
2 => " and 1 other".to_owned(),
|
||||
n => format!(" and {} others", n)
|
||||
};
|
||||
format!("there is an enum variant `{}`{}; ",
|
||||
enum_candidates[0].0, others)
|
||||
} else {
|
||||
String::new()
|
||||
};
|
||||
let msg = format!("{}try using the variant's enum", preamble);
|
||||
|
||||
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: DRYer prelude filtering.
|
||||
enum_ty_path.trim_start_matches("std::prelude::v1::").to_owned()
|
||||
}),
|
||||
Applicability::MachineApplicable,
|
||||
);
|
||||
}
|
||||
}
|
||||
if path.len() == 1 && self.self_type_is_available(span) {
|
||||
if let Some(candidate) = self.lookup_assoc_candidate(ident, ns, is_expected) {
|
||||
let self_is_available = self.self_value_is_available(path[0].ident.span, span);
|
||||
match candidate {
|
||||
AssocSuggestion::Field => {
|
||||
err.span_suggestion(
|
||||
span,
|
||||
"try",
|
||||
format!("self.{}", path_str),
|
||||
Applicability::MachineApplicable,
|
||||
);
|
||||
if !self_is_available {
|
||||
err.span_label(span, format!("`self` value is a keyword \
|
||||
only available in \
|
||||
methods with `self` parameter"));
|
||||
}
|
||||
}
|
||||
AssocSuggestion::MethodWithSelf if self_is_available => {
|
||||
err.span_suggestion(
|
||||
span,
|
||||
"try",
|
||||
format!("self.{}", path_str),
|
||||
Applicability::MachineApplicable,
|
||||
);
|
||||
}
|
||||
AssocSuggestion::MethodWithSelf | AssocSuggestion::AssocItem => {
|
||||
err.span_suggestion(
|
||||
span,
|
||||
"try",
|
||||
format!("Self::{}", path_str),
|
||||
Applicability::MachineApplicable,
|
||||
);
|
||||
}
|
||||
}
|
||||
return (err, candidates);
|
||||
}
|
||||
}
|
||||
|
||||
let mut levenshtein_worked = false;
|
||||
|
||||
// Try Levenshtein algorithm.
|
||||
let suggestion = self.lookup_typo_candidate(path, ns, is_expected, span);
|
||||
if let Some(suggestion) = suggestion {
|
||||
let msg = format!(
|
||||
"{} {} with a similar name exists",
|
||||
suggestion.article, suggestion.kind
|
||||
);
|
||||
err.span_suggestion(
|
||||
ident_span,
|
||||
&msg,
|
||||
suggestion.candidate.to_string(),
|
||||
Applicability::MaybeIncorrect,
|
||||
);
|
||||
|
||||
levenshtein_worked = true;
|
||||
}
|
||||
|
||||
// Try context-dependent help if relaxed lookup didn't work.
|
||||
if let Some(def) = def {
|
||||
if self.smart_resolve_context_dep_help(&mut err,
|
||||
span,
|
||||
source,
|
||||
def,
|
||||
&path_str,
|
||||
&fallback_label) {
|
||||
return (err, candidates);
|
||||
}
|
||||
}
|
||||
|
||||
// Fallback label.
|
||||
if !levenshtein_worked {
|
||||
err.span_label(base_span, fallback_label);
|
||||
self.type_ascription_suggestion(&mut err, base_span);
|
||||
}
|
||||
(err, candidates)
|
||||
}
|
||||
|
||||
fn smart_resolve_path_fragment(&mut self,
|
||||
id: NodeId,
|
||||
qself: Option<&QSelf>,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user