Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Display short types for unimplemented trait #121739

Merged
merged 3 commits into from
Mar 2, 2024
Merged

Display short types for unimplemented trait #121739

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
c0ce0f3
Display short types for unimplemented trait
jieyouxu Feb 28, 2024
a1dbb61
Unify long type name file and note in note_obligation_cause_code
jieyouxu Feb 28, 2024
62baa67
Avoid silently writing to a file when the involved ty is long
jieyouxu Mar 1, 2024
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
15 changes: 13 additions & 2 deletions compiler/rustc_hir_typeck/src/method/suggest.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1054,6 +1054,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
bound_list.into_iter().map(|(_, path)| path).collect::<Vec<_>>().join("\n");
let actual_prefix = rcvr_ty.prefix_string(self.tcx);
info!("unimplemented_traits.len() == {}", unimplemented_traits.len());
let mut long_ty_file = None;
let (primary_message, label) = if unimplemented_traits.len() == 1
&& unimplemented_traits_only
{
Expand All @@ -1066,8 +1067,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
// Avoid crashing.
return (None, None);
}
let OnUnimplementedNote { message, label, .. } =
self.err_ctxt().on_unimplemented_note(trait_ref, &obligation);
let OnUnimplementedNote { message, label, .. } = self
.err_ctxt()
.on_unimplemented_note(trait_ref, &obligation, &mut long_ty_file);
(message, label)
})
.unwrap()
Expand All @@ -1081,6 +1083,15 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
)
});
err.primary_message(primary_message);
if let Some(file) = long_ty_file {
err.note(format!(
"the full name for the type has been written to '{}'",
file.display(),
));
err.note(
"consider using `--verbose` to print the full type name to the console",
);
}
if let Some(label) = label {
custom_span_label = true;
err.span_label(span, label);
Expand Down
32 changes: 25 additions & 7 deletions compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ use rustc_session::lint::builtin::UNKNOWN_OR_MALFORMED_DIAGNOSTIC_ATTRIBUTES;
use rustc_span::symbol::{kw, sym, Symbol};
use rustc_span::Span;
use std::iter;
use std::path::PathBuf;

use crate::errors::{
EmptyOnClauseInOnUnimplemented, InvalidOnClauseInOnUnimplemented, NoValueInOnUnimplemented,
Expand Down Expand Up @@ -110,6 +111,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
&self,
trait_ref: ty::PolyTraitRef<'tcx>,
obligation: &PredicateObligation<'tcx>,
long_ty_file: &mut Option<PathBuf>,
) -> OnUnimplementedNote {
let (def_id, args) = self
.impl_similar_to(trait_ref, obligation)
Expand Down Expand Up @@ -265,7 +267,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}));

if let Ok(Some(command)) = OnUnimplementedDirective::of_item(self.tcx, def_id) {
command.evaluate(self.tcx, trait_ref, &flags)
command.evaluate(self.tcx, trait_ref, &flags, long_ty_file)
} else {
OnUnimplementedNote::default()
}
Expand Down Expand Up @@ -657,6 +659,7 @@ impl<'tcx> OnUnimplementedDirective {
tcx: TyCtxt<'tcx>,
trait_ref: ty::TraitRef<'tcx>,
options: &[(Symbol, Option<String>)],
long_ty_file: &mut Option<PathBuf>,
) -> OnUnimplementedNote {
let mut message = None;
let mut label = None;
Expand All @@ -669,6 +672,7 @@ impl<'tcx> OnUnimplementedDirective {
options.iter().filter_map(|(k, v)| v.clone().map(|v| (*k, v))).collect();

for command in self.subcommands.iter().chain(Some(self)).rev() {
debug!(?command);
if let Some(ref condition) = command.condition
&& !attr::eval_condition(condition, &tcx.sess, Some(tcx.features()), &mut |cfg| {
let value = cfg.value.map(|v| {
Expand All @@ -680,7 +684,12 @@ impl<'tcx> OnUnimplementedDirective {
span: cfg.span,
is_diagnostic_namespace_variant: false
}
.format(tcx, trait_ref, &options_map)
.format(
tcx,
trait_ref,
&options_map,
long_ty_file
)
)
});

Expand Down Expand Up @@ -709,10 +718,14 @@ impl<'tcx> OnUnimplementedDirective {
}

OnUnimplementedNote {
label: label.map(|l| l.format(tcx, trait_ref, &options_map)),
message: message.map(|m| m.format(tcx, trait_ref, &options_map)),
notes: notes.into_iter().map(|n| n.format(tcx, trait_ref, &options_map)).collect(),
parent_label: parent_label.map(|e_s| e_s.format(tcx, trait_ref, &options_map)),
label: label.map(|l| l.format(tcx, trait_ref, &options_map, long_ty_file)),
message: message.map(|m| m.format(tcx, trait_ref, &options_map, long_ty_file)),
notes: notes
.into_iter()
.map(|n| n.format(tcx, trait_ref, &options_map, long_ty_file))
.collect(),
parent_label: parent_label
.map(|e_s| e_s.format(tcx, trait_ref, &options_map, long_ty_file)),
append_const_msg,
}
}
Expand Down Expand Up @@ -814,6 +827,7 @@ impl<'tcx> OnUnimplementedFormatString {
tcx: TyCtxt<'tcx>,
trait_ref: ty::TraitRef<'tcx>,
options: &FxHashMap<Symbol, String>,
long_ty_file: &mut Option<PathBuf>,
) -> String {
let name = tcx.item_name(trait_ref.def_id);
let trait_str = tcx.def_path_str(trait_ref.def_id);
Expand All @@ -824,7 +838,11 @@ impl<'tcx> OnUnimplementedFormatString {
.filter_map(|param| {
let value = match param.kind {
GenericParamDefKind::Type { .. } | GenericParamDefKind::Const { .. } => {
trait_ref.args[param.index as usize].to_string()
if let Some(ty) = trait_ref.args[param.index as usize].as_type() {
tcx.short_ty_string(ty, long_ty_file)
} else {
trait_ref.args[param.index as usize].to_string()
}
}
GenericParamDefKind::Lifetime => return None,
};
Expand Down
61 changes: 22 additions & 39 deletions compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2676,6 +2676,8 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
) where
T: ToPredicate<'tcx>,
{
let mut long_ty_file = None;

let tcx = self.tcx;
let predicate = predicate.to_predicate(tcx);
match *cause_code {
Expand Down Expand Up @@ -2858,21 +2860,13 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
}
ObligationCauseCode::Coercion { source, target } => {
let mut file = None;
let source = tcx.short_ty_string(self.resolve_vars_if_possible(source), &mut file);
let target = tcx.short_ty_string(self.resolve_vars_if_possible(target), &mut file);
let source =
tcx.short_ty_string(self.resolve_vars_if_possible(source), &mut long_ty_file);
let target =
tcx.short_ty_string(self.resolve_vars_if_possible(target), &mut long_ty_file);
err.note(with_forced_trimmed_paths!(format!(
"required for the cast from `{source}` to `{target}`",
)));
if let Some(file) = file {
err.note(format!(
"the full name for the type has been written to '{}'",
file.display(),
));
err.note(
"consider using `--verbose` to print the full type name to the console",
);
}
}
ObligationCauseCode::RepeatElementCopy {
is_constable,
Expand Down Expand Up @@ -3175,8 +3169,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
// Don't print the tuple of capture types
'print: {
if !is_upvar_tys_infer_tuple {
let mut file = None;
let ty_str = tcx.short_ty_string(ty, &mut file);
let ty_str = tcx.short_ty_string(ty, &mut long_ty_file);
let msg = format!("required because it appears within the type `{ty_str}`");
match ty.kind() {
ty::Adt(def, _) => match tcx.opt_item_ident(def.did()) {
Expand Down Expand Up @@ -3274,9 +3267,8 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
let mut parent_trait_pred =
self.resolve_vars_if_possible(data.derived.parent_trait_pred);
let parent_def_id = parent_trait_pred.def_id();
let mut file = None;
let self_ty_str =
tcx.short_ty_string(parent_trait_pred.skip_binder().self_ty(), &mut file);
let self_ty_str = tcx
.short_ty_string(parent_trait_pred.skip_binder().self_ty(), &mut long_ty_file);
let trait_name = parent_trait_pred.print_modifiers_and_trait_path().to_string();
let msg = format!("required for `{self_ty_str}` to implement `{trait_name}`");
let mut is_auto_trait = false;
Expand Down Expand Up @@ -3334,15 +3326,6 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
};

if let Some(file) = file {
err.note(format!(
"the full type name has been written to '{}'",
file.display(),
));
err.note(
"consider using `--verbose` to print the full type name to the console",
);
}
let mut parent_predicate = parent_trait_pred;
let mut data = &data.derived;
let mut count = 0;
Expand Down Expand Up @@ -3383,22 +3366,14 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
count,
pluralize!(count)
));
let mut file = None;
let self_ty =
tcx.short_ty_string(parent_trait_pred.skip_binder().self_ty(), &mut file);
let self_ty = tcx.short_ty_string(
parent_trait_pred.skip_binder().self_ty(),
&mut long_ty_file,
);
err.note(format!(
"required for `{self_ty}` to implement `{}`",
parent_trait_pred.print_modifiers_and_trait_path()
));
if let Some(file) = file {
err.note(format!(
"the full type name has been written to '{}'",
file.display(),
));
err.note(
"consider using `--verbose` to print the full type name to the console",
);
}
}
// #74711: avoid a stack overflow
ensure_sufficient_stack(|| {
Expand Down Expand Up @@ -3507,7 +3482,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
ObligationCauseCode::OpaqueReturnType(expr_info) => {
if let Some((expr_ty, expr_span)) = expr_info {
let expr_ty = with_forced_trimmed_paths!(self.ty_to_string(expr_ty));
let expr_ty = self.tcx.short_ty_string(expr_ty, &mut long_ty_file);
err.span_label(
expr_span,
with_forced_trimmed_paths!(format!(
Expand All @@ -3517,6 +3492,14 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
}
}

if let Some(file) = long_ty_file {
err.note(format!(
"the full name for the type has been written to '{}'",
file.display(),
));
err.note("consider using `--verbose` to print the full type name to the console");
}
}

#[instrument(
Expand Down
17 changes: 15 additions & 2 deletions compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -389,6 +389,7 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
kind: _,
} = *obligation.cause.code()
{
debug!("ObligationCauseCode::CompareImplItemObligation");
return self.report_extra_impl_obligation(
span,
impl_item_def_id,
Expand Down Expand Up @@ -439,18 +440,21 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
)
})
.unwrap_or_default();
let file_note = file.map(|file| format!(
let file_note = file.as_ref().map(|file| format!(
"the full trait has been written to '{}'",
file.display(),
));

let mut long_ty_file = None;

let OnUnimplementedNote {
message,
label,
notes,
parent_label,
append_const_msg,
} = self.on_unimplemented_note(trait_ref, &obligation);
} = self.on_unimplemented_note(trait_ref, &obligation, &mut long_ty_file);

let have_alt_message = message.is_some() || label.is_some();
let is_try_conversion = self.is_try_conversion(span, trait_ref.def_id());
let is_unsize =
Expand Down Expand Up @@ -505,6 +509,13 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {

let mut err = struct_span_code_err!(self.dcx(), span, E0277, "{}", err_msg);

if let Some(long_ty_file) = long_ty_file {
err.note(format!(
"the full name for the type has been written to '{}'",
long_ty_file.display(),
));
err.note("consider using `--verbose` to print the full type name to the console");
}
let mut suggested = false;
if is_try_conversion {
suggested = self.try_conversion_context(&obligation, trait_ref.skip_binder(), &mut err);
Expand Down Expand Up @@ -752,6 +763,8 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
return err.emit();
}



err
}

Expand Down
17 changes: 17 additions & 0 deletions tests/ui/traits/on_unimplemented_long_types.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
//@ compile-flags: --diagnostic-width=60 -Z write-long-types-to-disk=yes
//@ normalize-stderr-test: "long-type-\d+" -> "long-type-hash"

pub fn foo() -> impl std::fmt::Display {
//~^ ERROR doesn't implement `std::fmt::Display`
Some(Some(Some(Some(Some(Some(Some(Some(Some(Some(Some(
Some(Some(Some(Some(Some(Some(Some(Some(Some(Some(Some(
Some(Some(Some(Some(Some(Some(Some(Some(Some(Some(Some(
Some(Some(Some(Some(Some(Some(Some(Some(Some(Some(Some(
Some(Some(Some(Some(Some(Some(Some(Some(())))))))),
))))))))))),
))))))))))),
))))))))))),
)))))))))))
}

fn main() {}
25 changes: 25 additions & 0 deletions tests/ui/traits/on_unimplemented_long_types.stderr
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
error[E0277]: `Option<Option<Option<...>>>` doesn't implement `std::fmt::Display`
--> $DIR/on_unimplemented_long_types.rs:4:17
|
LL | pub fn foo() -> impl std::fmt::Display {
| ^^^^^^^^^^^^^^^^^^^^^^ `Option<Option<Option<...>>>` cannot be formatted with the default formatter
LL |
LL | / Some(Some(Some(Some(Some(Some(Some(Some(Some(S...
LL | | Some(Some(Some(Some(Some(Some(Some(Some(So...
LL | | Some(Some(Some(Some(Some(Some(Some(Som...
LL | | Some(Some(Some(Some(Some(Some(Some...
... |
LL | | ))))))))))),
LL | | )))))))))))
| |_______________- return type was inferred to be `Option<Option<Option<...>>>` here
|
= note: the full name for the type has been written to '$TEST_BUILD_DIR/traits/on_unimplemented_long_types/on_unimplemented_long_types.long-type-hash.txt'
= note: consider using `--verbose` to print the full type name to the console
= help: the trait `std::fmt::Display` is not implemented for `Option<Option<Option<...>>>`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
= note: the full name for the type has been written to '$TEST_BUILD_DIR/traits/on_unimplemented_long_types/on_unimplemented_long_types.long-type-hash.txt'
= note: consider using `--verbose` to print the full type name to the console

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.