nordic-dev.net/rust
nordic-dev.net/rust
2
0
Fork 0
mirror of https://github.com/rust-lang/rust.git synced 2024-10-30 22:12:15 +00:00
Code Issues Packages Projects Releases Wiki Activity

make ascribe_user_type a TypeOp

Browse Source 
Projection types in user annotations may contain inference variables.
This makes the normalization depend on the unification with the actual
type and thus requires a separate TypeOp to track the obligations.
Otherwise simply calling `TypeChecker::normalize` would ICE with
"unexpected ambiguity"
This commit is contained in:
Ali MJ Al-Nasrawy 2022-11-16 13:11:44 +03:00
parent 37b40e471a
commit c6a17bf8bc
15 changed files with 350 additions and 186 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

78
compiler/rustc_borrowck/src/type_check/canonical.rs
View File

@ -1,13 +1,13 @@
use std::fmt;
use rustc_infer::infer::canonical::Canonical;
use rustc_infer::traits::query::NoSolution;
use rustc_infer::infer::{canonical::Canonical, InferOk};
use rustc_middle::mir::ConstraintCategory;
use rustc_middle::ty::{self, ToPredicate, TypeFoldable};
use rustc_middle::ty::{self, ToPredicate, Ty, TypeFoldable};
use rustc_span::def_id::DefId;
use rustc_span::Span;
use rustc_trait_selection::traits::query::type_op::{self, TypeOpOutput};
use rustc_trait_selection::traits::query::Fallible;
use rustc_trait_selection::traits::query::{Fallible, NoSolution};
use rustc_trait_selection::traits::{ObligationCause, ObligationCtxt};
use crate::diagnostics::{ToUniverseInfo, UniverseInfo};
@ -177,4 +177,74 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
value
})
}
#[instrument(skip(self), level = "debug")]
pub(super) fn ascribe_user_type(
&mut self,
mir_ty: Ty<'tcx>,
user_ty: ty::UserType<'tcx>,
span: Span,
) {
// FIXME: Ideally MIR types are normalized, but this is not always true.
let mir_ty = self.normalize(mir_ty, Locations::All(span));
self.fully_perform_op(
Locations::All(span),
ConstraintCategory::Boring,
self.param_env.and(type_op::ascribe_user_type::AscribeUserType::new(mir_ty, user_ty)),
)
.unwrap_or_else(|err| {
span_mirbug!(
self,
span,
"ascribe_user_type `{mir_ty:?}=={user_ty:?}` failed with `{err:?}`",
);
});
}
/// *Incorrectly* skips the WF checks we normally do in `ascribe_user_type`.
///
/// FIXME(#104478, #104477): This is a hack for backward-compatibility.
#[instrument(skip(self), level = "debug")]
pub(super) fn ascribe_user_type_skip_wf(
&mut self,
mir_ty: Ty<'tcx>,
user_ty: ty::UserType<'tcx>,
span: Span,
) {
let ty::UserType::Ty(user_ty) = user_ty else { bug!() };
// A fast path for a common case with closure input/output types.
if let ty::Infer(_) = user_ty.kind() {
self.eq_types(user_ty, mir_ty, Locations::All(span), ConstraintCategory::Boring)
.unwrap();
return;
}
let mir_ty = self.normalize(mir_ty, Locations::All(span));
let cause = ObligationCause::dummy_with_span(span);
let param_env = self.param_env;
let op = |infcx: &'_ _| {
let ocx = ObligationCtxt::new_in_snapshot(infcx);
let user_ty = ocx.normalize(&cause, param_env, user_ty);
ocx.eq(&cause, param_env, user_ty, mir_ty)?;
if !ocx.select_all_or_error().is_empty() {
return Err(NoSolution);
}
Ok(InferOk { value: (), obligations: vec![] })
};
self.fully_perform_op(
Locations::All(span),
ConstraintCategory::Boring,
type_op::custom::CustomTypeOp::new(op, || "ascribe_user_type_skip_wf".to_string()),
)
.unwrap_or_else(|err| {
span_mirbug!(
self,
span,
"ascribe_user_type_skip_wf `{mir_ty:?}=={user_ty:?}` failed with `{err:?}`",
);
});
}
}

126
compiler/rustc_borrowck/src/type_check/input_output.rs
View File

@ -10,7 +10,7 @@
use rustc_index::vec::Idx;
use rustc_infer::infer::LateBoundRegionConversionTime;
use rustc_middle::mir::*;
use rustc_middle::ty::Ty;
use rustc_middle::ty::{self, Ty};
use rustc_span::Span;
use crate::universal_regions::UniversalRegions;
@ -18,6 +18,52 @@ use crate::universal_regions::UniversalRegions;
use super::{Locations, TypeChecker};
impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
/// Check explicit closure signature annotation,
/// e.g., `|x: FxHashMap<_, &'static u32>| ...`.
#[instrument(skip(self, body), level = "debug")]
pub(super) fn check_signature_annotation(&mut self, body: &Body<'tcx>) {
let mir_def_id = body.source.def_id().expect_local();
if !self.tcx().is_closure(mir_def_id.to_def_id()) {
return;
}
let Some(user_provided_poly_sig) =
self.tcx().typeck(mir_def_id).user_provided_sigs.get(&mir_def_id)
else {
return;
};
// Instantiate the canonicalized variables from user-provided signature
// (e.g., the `_` in the code above) with fresh variables.
// Then replace the bound items in the fn sig with fresh variables,
// so that they represent the view from "inside" the closure.
let user_provided_sig = self
.instantiate_canonical_with_fresh_inference_vars(body.span, &user_provided_poly_sig);
let user_provided_sig = self.infcx.replace_bound_vars_with_fresh_vars(
body.span,
LateBoundRegionConversionTime::FnCall,
user_provided_sig,
);
for (&user_ty, arg_decl) in user_provided_sig.inputs().iter().zip(
// In MIR, closure args begin with an implicit `self`. Skip it!
body.args_iter().skip(1).map(|local| &body.local_decls[local]),
) {
self.ascribe_user_type_skip_wf(
arg_decl.ty,
ty::UserType::Ty(user_ty),
arg_decl.source_info.span,
);
}
// If the user explicitly annotated the output type, enforce it.
let output_decl = &body.local_decls[RETURN_PLACE];
self.ascribe_user_type_skip_wf(
output_decl.ty,
ty::UserType::Ty(user_provided_sig.output()),
output_decl.source_info.span,
);
}
#[instrument(skip(self, body, universal_regions), level = "debug")]
pub(super) fn equate_inputs_and_outputs(
&mut self,
@ -31,39 +77,6 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
debug!(?normalized_output_ty);
debug!(?normalized_input_tys);
let mir_def_id = body.source.def_id().expect_local();
// If the user explicitly annotated the input types, extract
// those.
//
// e.g., `|x: FxHashMap<_, &'static u32>| ...`
let user_provided_sig = if !self.tcx().is_closure(mir_def_id.to_def_id()) {
None
} else {
let typeck_results = self.tcx().typeck(mir_def_id);
typeck_results.user_provided_sigs.get(&mir_def_id).map(|user_provided_poly_sig| {
// Instantiate the canonicalized variables from
// user-provided signature (e.g., the `_` in the code
// above) with fresh variables.
let poly_sig = self.instantiate_canonical_with_fresh_inference_vars(
body.span,
&user_provided_poly_sig,
);
// Replace the bound items in the fn sig with fresh
// variables, so that they represent the view from
// "inside" the closure.
self.infcx.replace_bound_vars_with_fresh_vars(
body.span,
LateBoundRegionConversionTime::FnCall,
poly_sig,
)
})
};
debug!(?normalized_input_tys, ?body.local_decls);
// Equate expected input tys with those in the MIR.
for (argument_index, &normalized_input_ty) in normalized_input_tys.iter().enumerate() {
if argument_index + 1 >= body.local_decls.len() {
@ -86,28 +99,6 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
);
}
if let Some(user_provided_sig) = user_provided_sig {
for (argument_index, &user_provided_input_ty) in
user_provided_sig.inputs().iter().enumerate()
{
// In MIR, closures begin an implicit `self`, so
// argument N is stored in local N+2.
let local = Local::new(argument_index + 2);
let mir_input_ty = body.local_decls[local].ty;
let mir_input_span = body.local_decls[local].source_info.span;
// If the user explicitly annotated the input types, enforce those.
let user_provided_input_ty =
self.normalize(user_provided_input_ty, Locations::All(mir_input_span));
self.equate_normalized_input_or_output(
user_provided_input_ty,
mir_input_ty,
mir_input_span,
);
}
}
debug!(
"equate_inputs_and_outputs: body.yield_ty {:?}, universal_regions.yield_ty {:?}",
body.yield_ty(),
@ -153,29 +144,6 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
terr
);
};
// If the user explicitly annotated the output types, enforce those.
// Note that this only happens for closures.
if let Some(user_provided_sig) = user_provided_sig {
let user_provided_output_ty = user_provided_sig.output();
let user_provided_output_ty =
self.normalize(user_provided_output_ty, Locations::All(output_span));
if let Err(err) = self.eq_types(
user_provided_output_ty,
mir_output_ty,
Locations::All(output_span),
ConstraintCategory::BoringNoLocation,
) {
span_mirbug!(
self,
Location::START,
"equate_inputs_and_outputs: `{:?}=={:?}` failed with `{:?}`",
mir_output_ty,
user_provided_output_ty,
err
);
}
}
}
#[instrument(skip(self), level = "debug")]

72
compiler/rustc_borrowck/src/type_check/mod.rs
View File

@ -38,7 +38,6 @@ use rustc_middle::ty::{
use rustc_span::def_id::CRATE_DEF_ID;
use rustc_span::{Span, DUMMY_SP};
use rustc_target::abi::VariantIdx;
use rustc_trait_selection::traits::query::type_op;
use rustc_trait_selection::traits::query::type_op::custom::scrape_region_constraints;
use rustc_trait_selection::traits::query::type_op::custom::CustomTypeOp;
use rustc_trait_selection::traits::query::type_op::{TypeOp, TypeOpOutput};
@ -197,6 +196,8 @@ pub(crate) fn type_check<'mir, 'tcx>(
}
checker.equate_inputs_and_outputs(&body, universal_regions, &normalized_inputs_and_output);
checker.check_signature_annotation(&body);
liveness::generate(
&mut checker,
body,
@ -391,24 +392,15 @@ impl<'a, 'b, 'tcx> Visitor<'tcx> for TypeVerifier<'a, 'b, 'tcx> {
check_err(self, promoted_body, ty, promoted_ty);
}
} else {
if let Err(terr) = self.cx.fully_perform_op(
locations,
ConstraintCategory::Boring,
self.cx.param_env.and(type_op::ascribe_user_type::AscribeUserType::new(
self.cx.ascribe_user_type(
constant.literal.ty(),
UserType::TypeOf(
uv.def.did,
UserSubsts { substs: uv.substs, user_self_ty: None },
)),
) {
span_mirbug!(
self,
constant,
"bad constant type {:?} ({:?})",
constant,
terr
),
locations.span(&self.cx.body),
);
}
}
} else if let Some(static_def_id) = constant.check_static_ptr(tcx) {
let unnormalized_ty = tcx.type_of(static_def_id);
let normalized_ty = self.cx.normalize(unnormalized_ty, locations);
@ -1041,58 +1033,8 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
debug!(?self.user_type_annotations);
for user_annotation in self.user_type_annotations {
let CanonicalUserTypeAnnotation { span, ref user_ty, inferred_ty } = *user_annotation;
let inferred_ty = self.normalize(inferred_ty, Locations::All(span));
let annotation = self.instantiate_canonical_with_fresh_inference_vars(span, user_ty);
debug!(?annotation);
match annotation {
UserType::Ty(mut ty) => {
ty = self.normalize(ty, Locations::All(span));
if let Err(terr) = self.eq_types(
ty,
inferred_ty,
Locations::All(span),
ConstraintCategory::BoringNoLocation,
) {
span_mirbug!(
self,
user_annotation,
"bad user type ({:?} = {:?}): {:?}",
ty,
inferred_ty,
terr
);
}
self.prove_predicate(
ty::Binder::dummy(ty::PredicateKind::WellFormed(inferred_ty.into())),
Locations::All(span),
ConstraintCategory::TypeAnnotation,
);
}
UserType::TypeOf(def_id, user_substs) => {
if let Err(terr) = self.fully_perform_op(
Locations::All(span),
ConstraintCategory::BoringNoLocation,
self.param_env.and(type_op::ascribe_user_type::AscribeUserType::new(
inferred_ty,
def_id,
user_substs,
)),
) {
span_mirbug!(
self,
user_annotation,
"bad user type AscribeUserType({:?}, {:?} {:?}, type_of={:?}): {:?}",
inferred_ty,
def_id,
user_substs,
self.tcx().type_of(def_id),
terr,
);
}
}
}
self.ascribe_user_type(inferred_ty, annotation, span);
}
}

11
compiler/rustc_middle/src/traits/query.rs
View File

@ -15,22 +15,19 @@ use rustc_span::source_map::Span;
pub mod type_op {
use crate::ty::fold::TypeFoldable;
use crate::ty::subst::UserSubsts;
use crate::ty::{Predicate, Ty};
use rustc_hir::def_id::DefId;
use crate::ty::{Predicate, Ty, UserType};
use std::fmt;
#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, HashStable, Lift)]
#[derive(TypeFoldable, TypeVisitable)]
pub struct AscribeUserType<'tcx> {
pub mir_ty: Ty<'tcx>,
pub def_id: DefId,
pub user_substs: UserSubsts<'tcx>,
pub user_ty: UserType<'tcx>,
}
impl<'tcx> AscribeUserType<'tcx> {
pub fn new(mir_ty: Ty<'tcx>, def_id: DefId, user_substs: UserSubsts<'tcx>) -> Self {
Self { mir_ty, def_id, user_substs }
pub fn new(mir_ty: Ty<'tcx>, user_ty: UserType<'tcx>) -> Self {
Self { mir_ty, user_ty }
}
}

2
compiler/rustc_middle/src/ty/typeck_results.rs
View File

@ -679,7 +679,7 @@ impl<'tcx> CanonicalUserType<'tcx> {
/// from constants that are named via paths, like `Foo::<A>::new` and
/// so forth.
#[derive(Copy, Clone, Debug, PartialEq, TyEncodable, TyDecodable)]
#[derive(HashStable, TypeFoldable, TypeVisitable, Lift)]
#[derive(Eq, Hash, HashStable, TypeFoldable, TypeVisitable, Lift)]
pub enum UserType<'tcx> {
Ty(Ty<'tcx>),

53
compiler/rustc_traits/src/type_op.rs
View File

@ -4,8 +4,8 @@ use rustc_infer::infer::{DefiningAnchor, TyCtxtInferExt};
use rustc_infer::traits::ObligationCauseCode;
use rustc_middle::ty::query::Providers;
use rustc_middle::ty::{self, FnSig, Lift, PolyFnSig, Ty, TyCtxt, TypeFoldable};
use rustc_middle::ty::{ParamEnvAnd, Predicate, ToPredicate};
use rustc_middle::ty::{UserSelfTy, UserSubsts};
use rustc_middle::ty::{ParamEnvAnd, Predicate};
use rustc_middle::ty::{UserSelfTy, UserSubsts, UserType};
use rustc_span::{Span, DUMMY_SP};
use rustc_trait_selection::infer::InferCtxtBuilderExt;
use rustc_trait_selection::traits::query::normalize::QueryNormalizeExt;
@ -50,13 +50,46 @@ pub fn type_op_ascribe_user_type_with_span<'tcx>(
key: ParamEnvAnd<'tcx, AscribeUserType<'tcx>>,
span: Option<Span>,
) -> Result<(), NoSolution> {
let (param_env, AscribeUserType { mir_ty, def_id, user_substs }) = key.into_parts();
debug!(
"type_op_ascribe_user_type: mir_ty={:?} def_id={:?} user_substs={:?}",
mir_ty, def_id, user_substs
);
let (param_env, AscribeUserType { mir_ty, user_ty }) = key.into_parts();
debug!("type_op_ascribe_user_type: mir_ty={:?} user_ty={:?}", mir_ty, user_ty);
let span = span.unwrap_or(DUMMY_SP);
match user_ty {
UserType::Ty(user_ty) => relate_mir_and_user_ty(ocx, param_env, span, mir_ty, user_ty)?,
UserType::TypeOf(def_id, user_substs) => {
relate_mir_and_user_substs(ocx, param_env, span, mir_ty, def_id, user_substs)?
}
};
Ok(())
}
#[instrument(level = "debug", skip(ocx, param_env, span))]
fn relate_mir_and_user_ty<'tcx>(
ocx: &ObligationCtxt<'_, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
span: Span,
mir_ty: Ty<'tcx>,
user_ty: Ty<'tcx>,
) -> Result<(), NoSolution> {
let cause = ObligationCause::dummy_with_span(span);
let user_ty = ocx.normalize(&cause, param_env, user_ty);
ocx.eq(&cause, param_env, mir_ty, user_ty)?;
// FIXME(#104764): We should check well-formedness before normalization.
let predicate = ty::Binder::dummy(ty::PredicateKind::WellFormed(user_ty.into()));
ocx.register_obligation(Obligation::new(ocx.infcx.tcx, cause, param_env, predicate));
Ok(())
}
#[instrument(level = "debug", skip(ocx, param_env, span))]
fn relate_mir_and_user_substs<'tcx>(
ocx: &ObligationCtxt<'_, 'tcx>,
param_env: ty::ParamEnv<'tcx>,
span: Span,
mir_ty: Ty<'tcx>,
def_id: hir::def_id::DefId,
user_substs: UserSubsts<'tcx>,
) -> Result<(), NoSolution> {
let UserSubsts { user_self_ty, substs } = user_substs;
let tcx = ocx.infcx.tcx;
let cause = ObligationCause::dummy_with_span(span);
@ -97,8 +130,7 @@ pub fn type_op_ascribe_user_type_with_span<'tcx>(
ocx.eq(&cause, param_env, self_ty, impl_self_ty)?;
let predicate: Predicate<'tcx> =
ty::Binder::dummy(ty::PredicateKind::WellFormed(impl_self_ty.into())).to_predicate(tcx);
let predicate = ty::Binder::dummy(ty::PredicateKind::WellFormed(impl_self_ty.into()));
ocx.register_obligation(Obligation::new(tcx, cause.clone(), param_env, predicate));
}
@ -113,8 +145,7 @@ pub fn type_op_ascribe_user_type_with_span<'tcx>(
// them? This would only be relevant if some input
// type were ill-formed but did not appear in `ty`,
// which...could happen with normalization...
let predicate: Predicate<'tcx> =
ty::Binder::dummy(ty::PredicateKind::WellFormed(ty.into())).to_predicate(tcx);
let predicate = ty::Binder::dummy(ty::PredicateKind::WellFormed(ty.into()));
ocx.register_obligation(Obligation::new(tcx, cause, param_env, predicate));
Ok(())
}

16
src/test/ui/nll/ty-outlives/wf-unreachable.stderr
View File

@ -5,7 +5,7 @@ LL | fn uninit<'a>() {
| -- lifetime `'a` defined here
LL | return;
LL | let x: &'static &'a ();
| ^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
| ^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
error: lifetime may not live long enough
--> $DIR/wf-unreachable.rs:11:12
@ -14,7 +14,7 @@ LL | fn var_type<'a>() {
| -- lifetime `'a` defined here
LL | return;
LL | let x: &'static &'a () = &&();
| ^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
| ^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
error: lifetime may not live long enough
--> $DIR/wf-unreachable.rs:15:12
@ -22,7 +22,7 @@ error: lifetime may not live long enough
LL | fn uninit_infer<'a>() {
| -- lifetime `'a` defined here
LL | let x: &'static &'a _;
| ^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
| ^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
error: lifetime may not live long enough
--> $DIR/wf-unreachable.rs:21:12
@ -31,7 +31,7 @@ LL | fn infer<'a>() {
| -- lifetime `'a` defined here
LL | return;
LL | let x: &'static &'a _ = &&();
| ^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
| ^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
error: lifetime may not live long enough
--> $DIR/wf-unreachable.rs:26:12
@ -40,7 +40,7 @@ LL | fn uninit_no_var<'a>() {
| -- lifetime `'a` defined here
LL | return;
LL | let _: &'static &'a ();
| ^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
| ^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
error: lifetime may not live long enough
--> $DIR/wf-unreachable.rs:31:12
@ -49,7 +49,7 @@ LL | fn no_var<'a>() {
| -- lifetime `'a` defined here
LL | return;
LL | let _: &'static &'a () = &&();
| ^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
| ^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
error: lifetime may not live long enough
--> $DIR/wf-unreachable.rs:36:12
@ -58,7 +58,7 @@ LL | fn infer_no_var<'a>() {
| -- lifetime `'a` defined here
LL | return;
LL | let _: &'static &'a _ = &&();
| ^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
| ^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
error: lifetime may not live long enough
--> $DIR/wf-unreachable.rs:49:12
@ -67,7 +67,7 @@ LL | fn required_substs<'a>() {
| -- lifetime `'a` defined here
LL | return;
LL | let _: C<'static, 'a, _> = C((), &(), &());
| ^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'static`
| ^^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'static`
error: aborting due to 8 previous errors

15
src/test/ui/nll/user-annotations/closure-sig.rs Normal file
View File

@ -0,0 +1,15 @@
// This test fails if #104478 is fixed before #104477.
// check-pass
struct Printer<'a, 'b>(&'a (), &'b ());
impl Printer<'_, '_> {
fn test(self) {
let clo = |_: &'_ Self| {};
clo(&self);
clo(&self);
}
}
fn main() {}

40
src/test/ui/nll/user-annotations/normalization-infer.rs Normal file
View File

@ -0,0 +1,40 @@
// Annnotations may contain projection types with inference variables as input.
// Make sure we don't get ambiguities when normalizing them.
// check-fail
// Single impl.
fn test1<A, B, C, D>(a: A, b: B, c: C) {
trait Tr { type Ty; }
impl<T: 'static> Tr for (T,) { type Ty = T; }
let _: <(_,) as Tr>::Ty = a; //~ ERROR type `A`
Some::<<(_,) as Tr>::Ty>(b); //~ ERROR type `B`
|| -> <(_,) as Tr>::Ty { c }; //~ ERROR type `C`
|d: <(_,) as Tr>::Ty| -> D { d }; //~ ERROR type `D`
}
// Two impls. The selected impl depends on the actual type.
fn test2<A, B, C>(a: A, b: B, c: C) {
trait Tr { type Ty; }
impl<T: 'static> Tr for (u8, T) { type Ty = T; }
impl<T> Tr for (i8, T) { type Ty = T; }
type Alias<X, Y> = (<(X, Y) as Tr>::Ty, X);
fn temp() -> String { todo!() }
// `u8` impl, requires static.
let _: Alias<_, _> = (a, 0u8); //~ ERROR type `A`
Some::<Alias<_, _>>((b, 0u8)); //~ ERROR type `B`
|| -> Alias<_, _> { (c, 0u8) }; //~ ERROR type `C`
let _: Alias<_, _> = (&temp(), 0u8); //~ ERROR temporary value
Some::<Alias<_, _>>((&temp(), 0u8)); //~ ERROR temporary value
// `i8` impl, no region constraints.
let _: Alias<_, _> = (&temp(), 0i8);
Some::<Alias<_, _>>((&temp(), 0i8));
}
fn main() {}

101
src/test/ui/nll/user-annotations/normalization-infer.stderr Normal file
View File

@ -0,0 +1,101 @@
error[E0310]: the parameter type `A` may not live long enough
--> $DIR/normalization-infer.rs:11:12
|
LL | let _: <(_,) as Tr>::Ty = a;
| ^^^^^^^^^^^^^^^^ ...so that the type `A` will meet its required lifetime bounds
|
help: consider adding an explicit lifetime bound...
|
LL | fn test1<A: 'static, B, C, D>(a: A, b: B, c: C) {
| +++++++++
error[E0310]: the parameter type `B` may not live long enough
--> $DIR/normalization-infer.rs:12:5
|
LL | Some::<<(_,) as Tr>::Ty>(b);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `B` will meet its required lifetime bounds
|
help: consider adding an explicit lifetime bound...
|
LL | fn test1<A, B: 'static, C, D>(a: A, b: B, c: C) {
| +++++++++
error[E0310]: the parameter type `C` may not live long enough
--> $DIR/normalization-infer.rs:13:11
|
LL | || -> <(_,) as Tr>::Ty { c };
| ^^^^^^^^^^^^^^^^ ...so that the type `C` will meet its required lifetime bounds
|
help: consider adding an explicit lifetime bound...
|
LL | fn test1<A, B, C: 'static, D>(a: A, b: B, c: C) {
| +++++++++
error[E0310]: the parameter type `D` may not live long enough
--> $DIR/normalization-infer.rs:14:6
|
LL | |d: <(_,) as Tr>::Ty| -> D { d };
| ^ ...so that the type `D` will meet its required lifetime bounds
|
help: consider adding an explicit lifetime bound...
|
LL | fn test1<A, B, C, D: 'static>(a: A, b: B, c: C) {
| +++++++++
error[E0310]: the parameter type `A` may not live long enough
--> $DIR/normalization-infer.rs:28:12
|
LL | let _: Alias<_, _> = (a, 0u8);
| ^^^^^^^^^^^ ...so that the type `A` will meet its required lifetime bounds
|
help: consider adding an explicit lifetime bound...
|
LL | fn test2<A: 'static, B, C>(a: A, b: B, c: C) {
| +++++++++
error[E0310]: the parameter type `B` may not live long enough
--> $DIR/normalization-infer.rs:29:5
|
LL | Some::<Alias<_, _>>((b, 0u8));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ...so that the type `B` will meet its required lifetime bounds
|
help: consider adding an explicit lifetime bound...
|
LL | fn test2<A, B: 'static, C>(a: A, b: B, c: C) {
| +++++++++
error[E0310]: the parameter type `C` may not live long enough
--> $DIR/normalization-infer.rs:30:11
|
LL | || -> Alias<_, _> { (c, 0u8) };
| ^^^^^^^^^^^ ...so that the type `C` will meet its required lifetime bounds
|
help: consider adding an explicit lifetime bound...
|
LL | fn test2<A, B, C: 'static>(a: A, b: B, c: C) {
| +++++++++
error[E0716]: temporary value dropped while borrowed
--> $DIR/normalization-infer.rs:32:28
|
LL | let _: Alias<_, _> = (&temp(), 0u8);
| ----------- ^^^^^^ creates a temporary value which is freed while still in use
| |
| type annotation requires that borrow lasts for `'static`
...
LL | }
| - temporary value is freed at the end of this statement
error[E0716]: temporary value dropped while borrowed
--> $DIR/normalization-infer.rs:33:27
|
LL | Some::<Alias<_, _>>((&temp(), 0u8));
| --^^^^^^------ - temporary value is freed at the end of this statement
| | |
| | creates a temporary value which is freed while still in use
| this usage requires that borrow lasts for `'static`
error: aborting due to 9 previous errors
Some errors have detailed explanations: E0310, E0716.
For more information about an error, try `rustc --explain E0310`.

2
src/test/ui/regions/regions-assoc-type-in-supertrait-outlives-container.stderr
View File

@ -7,7 +7,7 @@ LL | fn with_assoc<'a,'b>() {
| lifetime `'a` defined here
...
LL | let _: &'a WithAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a`
|
= help: consider adding the following bound: `'b: 'a`

6
src/test/ui/regions/regions-free-region-ordering-caller.stderr
View File

@ -6,7 +6,7 @@ LL | fn call2<'a, 'b>(a: &'a usize, b: &'b usize) {
| |
| lifetime `'a` defined here
LL | let z: Option<&'b &'a usize> = None;
| ^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'b`
| ^^^^^^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'b`
|
= help: consider adding the following bound: `'a: 'b`
@ -19,7 +19,7 @@ LL | fn call3<'a, 'b>(a: &'a usize, b: &'b usize) {
| lifetime `'a` defined here
LL | let y: Paramd<'a> = Paramd { x: a };
LL | let z: Option<&'b Paramd<'a>> = None;
| ^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'a` must outlive `'b`
| ^^^^^^^^^^^^^^^^^^^^^^ requires that `'a` must outlive `'b`
|
= help: consider adding the following bound: `'a: 'b`
@ -31,7 +31,7 @@ LL | fn call4<'a, 'b>(a: &'a usize, b: &'b usize) {
| |
| lifetime `'a` defined here
LL | let z: Option<&'a &'b usize> = None;
| ^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
| ^^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a`
|
= help: consider adding the following bound: `'b: 'a`

4
src/test/ui/regions/regions-outlives-projection-container-hrtb.stderr
View File

@ -7,7 +7,7 @@ LL | fn with_assoc<'a,'b>() {
| lifetime `'a` defined here
...
LL | let _: &'a WithHrAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a`
|
= help: consider adding the following bound: `'b: 'a`
@ -20,7 +20,7 @@ LL | fn with_assoc_sub<'a,'b>() {
| lifetime `'a` defined here
...
LL | let _: &'a WithHrAssocSub<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a`
|
= help: consider adding the following bound: `'b: 'a`

2
src/test/ui/regions/regions-outlives-projection-container-wc.stderr
View File

@ -7,7 +7,7 @@ LL | fn with_assoc<'a,'b>() {
| lifetime `'a` defined here
...
LL | let _: &'a WithAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a`
|
= help: consider adding the following bound: `'b: 'a`

4
src/test/ui/regions/regions-outlives-projection-container.stderr
View File

@ -7,7 +7,7 @@ LL | fn with_assoc<'a,'b>() {
| lifetime `'a` defined here
...
LL | let _x: &'a WithAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a`
|
= help: consider adding the following bound: `'b: 'a`
@ -20,7 +20,7 @@ LL | fn without_assoc<'a,'b>() {
| lifetime `'a` defined here
...
LL | let _x: &'a WithoutAssoc<TheType<'b>> = loop { };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ type annotation requires that `'b` must outlive `'a`
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ requires that `'b` must outlive `'a`
|
= help: consider adding the following bound: `'b: 'a`