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This commit is contained in:
Esteban Küber 2020-01-19 17:48:47 -08:00
parent 0a6b5538ad
commit 03d7fed165
2 changed files with 81 additions and 76 deletions
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74
src/librustc_resolve/diagnostics.rs
View File

@ -5,8 +5,9 @@ use rustc::bug;
use rustc::session::Session;
use rustc::ty::{self, DefIdTree};
use rustc_data_structures::fx::FxHashSet;
use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticBuilder};
use rustc_feature::BUILTIN_ATTRIBUTES;
use rustc_hir as hir;
use rustc_hir::def::Namespace::{self, *};
use rustc_hir::def::{self, CtorKind, CtorOf, DefKind, NonMacroAttrKind};
use rustc_hir::def_id::{DefId, CRATE_DEF_INDEX, LOCAL_CRATE};
@ -1447,3 +1448,74 @@ crate fn show_candidates(
}
}
}
crate fn report_missing_lifetime_specifiers(
sess: &Session,
span: Span,
count: usize,
) -> DiagnosticBuilder<'_> {
struct_span_err!(sess, span, E0106, "missing lifetime specifier{}", pluralize!(count))
}
crate fn add_missing_lifetime_specifiers_label(
err: &mut DiagnosticBuilder<'_>,
span: Span,
count: usize,
lifetime_names: &FxHashSet<ast::Ident>,
snippet: Option<&str>,
missing_named_lifetime_spots: &[&hir::Generics<'_>],
) {
if count > 1 {
err.span_label(span, format!("expected {} lifetime parameters", count));
} else {
let suggest_existing = |err: &mut DiagnosticBuilder<'_>, sugg| {
err.span_suggestion(
span,
"consider using the named lifetime",
sugg,
Applicability::MaybeIncorrect,
);
};
let suggest_new = |err: &mut DiagnosticBuilder<'_>, sugg| {
err.span_label(span, "expected named lifetime parameter");
if let Some(generics) = missing_named_lifetime_spots.iter().last() {
let mut introduce_suggestion = vec![];
introduce_suggestion.push(match &generics.params {
[] => (generics.span, "<'lifetime>".to_string()),
[param, ..] => (param.span.shrink_to_lo(), "'lifetime, ".to_string()),
});
introduce_suggestion.push((span, sugg));
err.multipart_suggestion(
"consider introducing a named lifetime parameter",
introduce_suggestion,
Applicability::MaybeIncorrect,
);
}
};
match (lifetime_names.len(), lifetime_names.iter().next(), snippet) {
(1, Some(name), Some("&")) => {
suggest_existing(err, format!("&{} ", name));
}
(1, Some(name), Some("'_")) => {
suggest_existing(err, name.to_string());
}
(1, Some(name), Some(snippet)) if !snippet.ends_with(">") => {
suggest_existing(err, format!("{}<{}>", snippet, name));
}
(0, _, Some("&")) => {
suggest_new(err, "&'lifetime ".to_string());
}
(0, _, Some("'_")) => {
suggest_new(err, "'lifetime".to_string());
}
(0, _, Some(snippet)) if !snippet.ends_with(">") => {
suggest_new(err, format!("{}<'lifetime>", snippet));
}
_ => {
err.span_label(span, "expected lifetime parameter");
}
}
}
}

83
src/librustc_resolve/lifetimes.rs
View File

@ -5,14 +5,16 @@
//! used between functions, and they operate in a purely top-down
//! way. Therefore, we break lifetime name resolution into a separate pass.
use crate::diagnostics::{
add_missing_lifetime_specifiers_label, report_missing_lifetime_specifiers,
};
use rustc::hir::map::Map;
use rustc::lint;
use rustc::middle::resolve_lifetime::*;
use rustc::session::Session;
use rustc::ty::{self, DefIdTree, GenericParamDefKind, TyCtxt};
use rustc::{bug, span_bug};
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_errors::{pluralize, struct_span_err, Applicability, DiagnosticBuilder};
use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder};
use rustc_hir as hir;
use rustc_hir::def::{DefKind, Res};
use rustc_hir::def_id::{CrateNum, DefId, DefIdMap, LocalDefId, LOCAL_CRATE};
@ -1320,9 +1322,10 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
where
F: for<'b> FnOnce(ScopeRef<'_>, &mut LifetimeContext<'b, 'tcx>),
{
let LifetimeContext { tcx, map, lifetime_uses, missing_named_lifetime_spots, .. } = self;
let LifetimeContext { tcx, map, lifetime_uses, .. } = self;
let labels_in_fn = take(&mut self.labels_in_fn);
let xcrate_object_lifetime_defaults = take(&mut self.xcrate_object_lifetime_defaults);
let missing_named_lifetime_spots = take(&mut self.missing_named_lifetime_spots);
let mut this = LifetimeContext {
tcx: *tcx,
map: map,
@ -1332,7 +1335,7 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
labels_in_fn,
xcrate_object_lifetime_defaults,
lifetime_uses,
missing_named_lifetime_spots: missing_named_lifetime_spots.to_vec(),
missing_named_lifetime_spots,
};
debug!("entering scope {:?}", this.scope);
f(self.scope, &mut this);
@ -1340,6 +1343,7 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
debug!("exiting scope {:?}", this.scope);
self.labels_in_fn = this.labels_in_fn;
self.xcrate_object_lifetime_defaults = this.xcrate_object_lifetime_defaults;
self.missing_named_lifetime_spots = this.missing_named_lifetime_spots;
}
/// helper method to determine the span to remove when suggesting the
@ -2894,74 +2898,3 @@ fn insert_late_bound_lifetimes(
}
}
}
fn report_missing_lifetime_specifiers(
sess: &Session,
span: Span,
count: usize,
) -> DiagnosticBuilder<'_> {
struct_span_err!(sess, span, E0106, "missing lifetime specifier{}", pluralize!(count))
}
fn add_missing_lifetime_specifiers_label(
err: &mut DiagnosticBuilder<'_>,
span: Span,
count: usize,
lifetime_names: &FxHashSet<ast::Ident>,
snippet: Option<&str>,
missing_named_lifetime_spots: &[&hir::Generics<'_>],
) {
if count > 1 {
err.span_label(span, format!("expected {} lifetime parameters", count));
} else {
let suggest_existing = |err: &mut DiagnosticBuilder<'_>, sugg| {
err.span_suggestion(
span,
"consider using the named lifetime",
sugg,
Applicability::MaybeIncorrect,
);
};
let suggest_new = |err: &mut DiagnosticBuilder<'_>, sugg| {
err.span_label(span, "expected named lifetime parameter");
if let Some(generics) = missing_named_lifetime_spots.iter().last() {
let mut introduce_suggestion = vec![];
introduce_suggestion.push(match &generics.params {
[] => (generics.span, "<'lifetime>".to_string()),
[param, ..] => (param.span.shrink_to_lo(), "'lifetime, ".to_string()),
});
introduce_suggestion.push((span, sugg));
err.multipart_suggestion(
"consider introducing a named lifetime parameter",
introduce_suggestion,
Applicability::MaybeIncorrect,
);
}
};
match (lifetime_names.len(), lifetime_names.iter().next(), snippet) {
(1, Some(name), Some("&")) => {
suggest_existing(err, format!("&{} ", name));
}
(1, Some(name), Some("'_")) => {
suggest_existing(err, name.to_string());
}
(1, Some(name), Some(snippet)) if !snippet.ends_with(">") => {
suggest_existing(err, format!("{}<{}>", snippet, name));
}
(0, _, Some("&")) => {
suggest_new(err, "&'lifetime ".to_string());
}
(0, _, Some("'_")) => {
suggest_new(err, "'lifetime".to_string());
}
(0, _, Some(snippet)) if !snippet.ends_with(">") => {
suggest_new(err, format!("{}<'lifetime>", snippet));
}
_ => {
err.span_label(span, "expected lifetime parameter");
}
}
}
}