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Auto merge of rust-lang#121055 - matthiaskrgr:rollup-bzn5sda, r=matth…
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…iaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#118882 (Check normalized call signature for WF in mir typeck)
 - rust-lang#120999 (rustdoc: replace `clean::InstantiationParam` with `clean::GenericArg`)
 - rust-lang#121002 (remove unnecessary calls to `commit_if_ok`)
 - rust-lang#121005 (Remove jsha from the rustdoc review rotation)
 - rust-lang#121014 (Remove `force_print_diagnostic`)
 - rust-lang#121043 (add lcnr to the compiler-team assignment group)
 - rust-lang#121046 (Fix incorrect use of `compile_fail`)
 - rust-lang#121047 (Do not assemble candidates for default impls)

r? `@ghost`
`@rustbot` modify labels: rollup
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bors committed Feb 13, 2024
2 parents a84bb95 + ab1fa19 commit 670ffce
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Showing 23 changed files with 328 additions and 236 deletions.
24 changes: 20 additions & 4 deletions compiler/rustc_borrowck/src/type_check/mod.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1432,7 +1432,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
return;
}
};
let (sig, map) = tcx.instantiate_bound_regions(sig, |br| {
let (unnormalized_sig, map) = tcx.instantiate_bound_regions(sig, |br| {
use crate::renumber::RegionCtxt;

let region_ctxt_fn = || {
Expand All @@ -1454,7 +1454,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
region_ctxt_fn,
)
});
debug!(?sig);
debug!(?unnormalized_sig);
// IMPORTANT: We have to prove well formed for the function signature before
// we normalize it, as otherwise types like `<&'a &'b () as Trait>::Assoc`
// get normalized away, causing us to ignore the `'b: 'a` bound used by the function.
Expand All @@ -1464,15 +1464,31 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
//
// See #91068 for an example.
self.prove_predicates(
sig.inputs_and_output.iter().map(|ty| {
unnormalized_sig.inputs_and_output.iter().map(|ty| {
ty::Binder::dummy(ty::PredicateKind::Clause(ty::ClauseKind::WellFormed(
ty.into(),
)))
}),
term_location.to_locations(),
ConstraintCategory::Boring,
);
let sig = self.normalize(sig, term_location);

let sig = self.normalize(unnormalized_sig, term_location);
// HACK(#114936): `WF(sig)` does not imply `WF(normalized(sig))`
// with built-in `Fn` implementations, since the impl may not be
// well-formed itself.
if sig != unnormalized_sig {
self.prove_predicates(
sig.inputs_and_output.iter().map(|ty| {
ty::Binder::dummy(ty::PredicateKind::Clause(
ty::ClauseKind::WellFormed(ty.into()),
))
}),
term_location.to_locations(),
ConstraintCategory::Boring,
);
}

self.check_call_dest(body, term, &sig, *destination, *target, term_location);

// The ordinary liveness rules will ensure that all
Expand Down
105 changes: 70 additions & 35 deletions compiler/rustc_errors/src/lib.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,7 @@ use std::fmt;
use std::hash::Hash;
use std::io::Write;
use std::num::NonZeroUsize;
use std::ops::DerefMut;
use std::panic;
use std::path::{Path, PathBuf};

Expand Down Expand Up @@ -666,22 +667,51 @@ impl DiagCtxt {
/// tools that want to reuse a `Parser` cleaning the previously emitted diagnostics as well as
/// the overall count of emitted error diagnostics.
pub fn reset_err_count(&self) {
// Use destructuring so that if a field gets added to `DiagCtxtInner`, it's impossible to
// fail to update this method as well.
let mut inner = self.inner.borrow_mut();
inner.stashed_err_count = 0;
inner.deduplicated_err_count = 0;
inner.deduplicated_warn_count = 0;
inner.must_produce_diag = false;
inner.has_printed = false;
inner.suppressed_expected_diag = false;

// actually free the underlying memory (which `clear` would not do)
inner.err_guars = Default::default();
inner.lint_err_guars = Default::default();
inner.delayed_bugs = Default::default();
inner.taught_diagnostics = Default::default();
inner.emitted_diagnostic_codes = Default::default();
inner.emitted_diagnostics = Default::default();
inner.stashed_diagnostics = Default::default();
let DiagCtxtInner {
flags: _,
err_guars,
lint_err_guars,
delayed_bugs,
stashed_err_count,
deduplicated_err_count,
deduplicated_warn_count,
emitter: _,
must_produce_diag,
has_printed,
suppressed_expected_diag,
taught_diagnostics,
emitted_diagnostic_codes,
emitted_diagnostics,
stashed_diagnostics,
future_breakage_diagnostics,
check_unstable_expect_diagnostics,
unstable_expect_diagnostics,
fulfilled_expectations,
ice_file: _,
} = inner.deref_mut();

// For the `Vec`s and `HashMap`s, we overwrite with an empty container to free the
// underlying memory (which `clear` would not do).
*err_guars = Default::default();
*lint_err_guars = Default::default();
*delayed_bugs = Default::default();
*stashed_err_count = 0;
*deduplicated_err_count = 0;
*deduplicated_warn_count = 0;
*must_produce_diag = false;
*has_printed = false;
*suppressed_expected_diag = false;
*taught_diagnostics = Default::default();
*emitted_diagnostic_codes = Default::default();
*emitted_diagnostics = Default::default();
*stashed_diagnostics = Default::default();
*future_breakage_diagnostics = Default::default();
*check_unstable_expect_diagnostics = false;
*unstable_expect_diagnostics = Default::default();
*fulfilled_expectations = Default::default();
}

/// Stash a given diagnostic with the given `Span` and [`StashKey`] as the key.
Expand Down Expand Up @@ -780,11 +810,12 @@ impl DiagCtxt {
match (errors.len(), warnings.len()) {
(0, 0) => return,
(0, _) => {
// Use `inner.emitter` directly, otherwise the warning might not be emitted, e.g.
// with a configuration like `--cap-lints allow --force-warn bare_trait_objects`.
inner
.emitter
.emit_diagnostic(Diagnostic::new(Warning, DiagnosticMessage::Str(warnings)));
// Use `ForceWarning` rather than `Warning` to guarantee emission, e.g. with a
// configuration like `--cap-lints allow --force-warn bare_trait_objects`.
inner.emit_diagnostic(Diagnostic::new(
ForceWarning(None),
DiagnosticMessage::Str(warnings),
));
}
(_, 0) => {
inner.emit_diagnostic(Diagnostic::new(Error, errors));
Expand Down Expand Up @@ -812,20 +843,23 @@ impl DiagCtxt {
error_codes.sort();
if error_codes.len() > 1 {
let limit = if error_codes.len() > 9 { 9 } else { error_codes.len() };
inner.failure_note(format!(
let msg1 = format!(
"Some errors have detailed explanations: {}{}",
error_codes[..limit].join(", "),
if error_codes.len() > 9 { "..." } else { "." }
));
inner.failure_note(format!(
);
let msg2 = format!(
"For more information about an error, try `rustc --explain {}`.",
&error_codes[0]
));
);
inner.emit_diagnostic(Diagnostic::new(FailureNote, msg1));
inner.emit_diagnostic(Diagnostic::new(FailureNote, msg2));
} else {
inner.failure_note(format!(
let msg = format!(
"For more information about this error, try `rustc --explain {}`.",
&error_codes[0]
));
);
inner.emit_diagnostic(Diagnostic::new(FailureNote, msg));
}
}
}
Expand All @@ -848,10 +882,6 @@ impl DiagCtxt {
self.inner.borrow_mut().taught_diagnostics.insert(code)
}

pub fn force_print_diagnostic(&self, db: Diagnostic) {
self.inner.borrow_mut().emitter.emit_diagnostic(db);
}

pub fn emit_diagnostic(&self, diagnostic: Diagnostic) -> Option<ErrorGuaranteed> {
self.inner.borrow_mut().emit_diagnostic(diagnostic)
}
Expand Down Expand Up @@ -1179,7 +1209,7 @@ impl DiagCtxt {
span: impl Into<MultiSpan>,
msg: impl Into<DiagnosticMessage>,
) -> DiagnosticBuilder<'_, ()> {
DiagnosticBuilder::new(self, Note, msg).with_span(span)
self.struct_note(msg).with_span(span)
}

#[rustc_lint_diagnostics]
Expand Down Expand Up @@ -1207,6 +1237,15 @@ impl DiagCtxt {
DiagnosticBuilder::new(self, Help, msg)
}

#[rustc_lint_diagnostics]
#[track_caller]
pub fn struct_failure_note(
&self,
msg: impl Into<DiagnosticMessage>,
) -> DiagnosticBuilder<'_, ()> {
DiagnosticBuilder::new(self, FailureNote, msg)
}

#[rustc_lint_diagnostics]
#[track_caller]
pub fn struct_allow(&self, msg: impl Into<DiagnosticMessage>) -> DiagnosticBuilder<'_, ()> {
Expand Down Expand Up @@ -1406,10 +1445,6 @@ impl DiagCtxtInner {
.or_else(|| self.delayed_bugs.get(0).map(|(_, guar)| guar).copied())
}

fn failure_note(&mut self, msg: impl Into<DiagnosticMessage>) {
self.emit_diagnostic(Diagnostic::new(FailureNote, msg));
}

fn flush_delayed(&mut self) {
if self.delayed_bugs.is_empty() {
return;
Expand Down
48 changes: 20 additions & 28 deletions compiler/rustc_infer/src/infer/at.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -285,13 +285,11 @@ impl<'a, 'tcx> Trace<'a, 'tcx> {
T: Relate<'tcx>,
{
let Trace { at, trace, a_is_expected } = self;
at.infcx.commit_if_ok(|_| {
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
fields
.sub(a_is_expected)
.relate(a, b)
.map(move |_| InferOk { value: (), obligations: fields.obligations })
})
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
fields
.sub(a_is_expected)
.relate(a, b)
.map(move |_| InferOk { value: (), obligations: fields.obligations })
}

/// Makes `a == b`; the expectation is set by the call to
Expand All @@ -302,13 +300,11 @@ impl<'a, 'tcx> Trace<'a, 'tcx> {
T: Relate<'tcx>,
{
let Trace { at, trace, a_is_expected } = self;
at.infcx.commit_if_ok(|_| {
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
fields
.equate(a_is_expected)
.relate(a, b)
.map(move |_| InferOk { value: (), obligations: fields.obligations })
})
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
fields
.equate(a_is_expected)
.relate(a, b)
.map(move |_| InferOk { value: (), obligations: fields.obligations })
}

#[instrument(skip(self), level = "debug")]
Expand All @@ -317,13 +313,11 @@ impl<'a, 'tcx> Trace<'a, 'tcx> {
T: Relate<'tcx>,
{
let Trace { at, trace, a_is_expected } = self;
at.infcx.commit_if_ok(|_| {
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
fields
.lub(a_is_expected)
.relate(a, b)
.map(move |t| InferOk { value: t, obligations: fields.obligations })
})
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
fields
.lub(a_is_expected)
.relate(a, b)
.map(move |t| InferOk { value: t, obligations: fields.obligations })
}

#[instrument(skip(self), level = "debug")]
Expand All @@ -332,13 +326,11 @@ impl<'a, 'tcx> Trace<'a, 'tcx> {
T: Relate<'tcx>,
{
let Trace { at, trace, a_is_expected } = self;
at.infcx.commit_if_ok(|_| {
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
fields
.glb(a_is_expected)
.relate(a, b)
.map(move |t| InferOk { value: t, obligations: fields.obligations })
})
let mut fields = at.infcx.combine_fields(trace, at.param_env, define_opaque_types);
fields
.glb(a_is_expected)
.relate(a, b)
.map(move |t| InferOk { value: t, obligations: fields.obligations })
}
}

Expand Down
66 changes: 32 additions & 34 deletions compiler/rustc_infer/src/infer/canonical/query_response.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -620,42 +620,40 @@ impl<'tcx> InferCtxt<'tcx> {
variables1: &OriginalQueryValues<'tcx>,
variables2: impl Fn(BoundVar) -> GenericArg<'tcx>,
) -> InferResult<'tcx, ()> {
self.commit_if_ok(|_| {
let mut obligations = vec![];
for (index, value1) in variables1.var_values.iter().enumerate() {
let value2 = variables2(BoundVar::new(index));

match (value1.unpack(), value2.unpack()) {
(GenericArgKind::Type(v1), GenericArgKind::Type(v2)) => {
obligations.extend(
self.at(cause, param_env)
.eq(DefineOpaqueTypes::Yes, v1, v2)?
.into_obligations(),
);
}
(GenericArgKind::Lifetime(re1), GenericArgKind::Lifetime(re2))
if re1.is_erased() && re2.is_erased() =>
{
// no action needed
}
(GenericArgKind::Lifetime(v1), GenericArgKind::Lifetime(v2)) => {
obligations.extend(
self.at(cause, param_env)
.eq(DefineOpaqueTypes::Yes, v1, v2)?
.into_obligations(),
);
}
(GenericArgKind::Const(v1), GenericArgKind::Const(v2)) => {
let ok = self.at(cause, param_env).eq(DefineOpaqueTypes::Yes, v1, v2)?;
obligations.extend(ok.into_obligations());
}
_ => {
bug!("kind mismatch, cannot unify {:?} and {:?}", value1, value2,);
}
let mut obligations = vec![];
for (index, value1) in variables1.var_values.iter().enumerate() {
let value2 = variables2(BoundVar::new(index));

match (value1.unpack(), value2.unpack()) {
(GenericArgKind::Type(v1), GenericArgKind::Type(v2)) => {
obligations.extend(
self.at(cause, param_env)
.eq(DefineOpaqueTypes::Yes, v1, v2)?
.into_obligations(),
);
}
(GenericArgKind::Lifetime(re1), GenericArgKind::Lifetime(re2))
if re1.is_erased() && re2.is_erased() =>
{
// no action needed
}
(GenericArgKind::Lifetime(v1), GenericArgKind::Lifetime(v2)) => {
obligations.extend(
self.at(cause, param_env)
.eq(DefineOpaqueTypes::Yes, v1, v2)?
.into_obligations(),
);
}
(GenericArgKind::Const(v1), GenericArgKind::Const(v2)) => {
let ok = self.at(cause, param_env).eq(DefineOpaqueTypes::Yes, v1, v2)?;
obligations.extend(ok.into_obligations());
}
_ => {
bug!("kind mismatch, cannot unify {:?} and {:?}", value1, value2,);
}
}
Ok(InferOk { value: (), obligations })
})
}
Ok(InferOk { value: (), obligations })
}
}

Expand Down
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