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Actually, just reuse the UNUSED_LIFETIMES lint

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This commit is contained in:
Michael Goulet 2023-11-27 21:54:03 +00:00
parent 03c901fd35
commit 89409494e3
13 changed files with 107 additions and 124 deletions
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26
compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs
View File

@ -20,7 +20,6 @@ use rustc_middle::hir::nested_filter;
use rustc_middle::middle::resolve_bound_vars::*;
use rustc_middle::query::Providers;
use rustc_middle::ty::{self, TyCtxt, TypeSuperVisitable, TypeVisitor};
use rustc_session::lint;
use rustc_span::def_id::DefId;
use rustc_span::symbol::{sym, Ident};
use rustc_span::Span;
@ -867,31 +866,6 @@ impl<'a, 'tcx> Visitor<'tcx> for BoundVarContext<'a, 'tcx> {
}) => {
self.visit_lifetime(lifetime);
walk_list!(self, visit_param_bound, bounds);
if lifetime.res != hir::LifetimeName::Static {
for bound in bounds {
let hir::GenericBound::Outlives(lt) = bound else {
continue;
};
if lt.res != hir::LifetimeName::Static {
continue;
}
self.insert_lifetime(lt, ResolvedArg::StaticLifetime);
self.tcx.node_span_lint(
lint::builtin::UNUSED_LIFETIMES,
lifetime.hir_id,
lifetime.ident.span,
format!("unnecessary lifetime parameter `{}`", lifetime.ident),
|lint| {
let help = format!(
"you can use the `'static` lifetime directly, in place of `{}`",
lifetime.ident,
);
lint.help(help);
},
);
}
}
}
&hir::WherePredicate::EqPredicate(hir::WhereEqPredicate { lhs_ty, rhs_ty, .. }) => {
self.visit_ty(lhs_ty);

3
compiler/rustc_lint/messages.ftl
View File

@ -534,7 +534,8 @@ lint_reason_must_be_string_literal = reason must be a string literal
lint_reason_must_come_last = reason in lint attribute must come last
lint_redundant_lifetime_args = lifetime `{$victim}` is required to be equal to `{$candidate}`, and is redundant and can be removed
lint_redundant_lifetime_args = unnecessary lifetime parameter `{$victim}`
.note = you can use the `{$candidate}` lifetime directly, in place of `{$victim}`
lint_redundant_semicolons =
unnecessary trailing {$multiple ->

17
compiler/rustc_lint/src/redundant_lifetime_args.rs
View File

@ -8,19 +8,13 @@ use rustc_infer::infer::outlives::env::OutlivesEnvironment;
use rustc_infer::infer::{SubregionOrigin, TyCtxtInferExt};
use rustc_macros::LintDiagnostic;
use rustc_middle::ty::{self, TyCtxt};
use rustc_session::lint::builtin::UNUSED_LIFETIMES;
use rustc_span::DUMMY_SP;
use rustc_trait_selection::traits::{outlives_bounds::InferCtxtExt, ObligationCtxt};
use crate::{LateContext, LateLintPass};
declare_lint! {
/// Docs
pub REDUNDANT_LIFETIME_ARGS,
Allow,
"do something"
}
declare_lint_pass!(RedundantLifetimeArgs => [REDUNDANT_LIFETIME_ARGS]);
declare_lint_pass!(RedundantLifetimeArgs => []);
impl<'tcx> LateLintPass<'tcx> for RedundantLifetimeArgs {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx hir::Item<'tcx>) {
@ -142,10 +136,10 @@ fn check<'tcx>(tcx: TyCtxt<'tcx>, param_env: ty::ParamEnv<'tcx>, owner_id: hir::
if infcx.resolve_regions(outlives_env).is_empty() {
shadowed.insert(victim);
tcx.emit_spanned_lint(
REDUNDANT_LIFETIME_ARGS,
UNUSED_LIFETIMES,
tcx.local_def_id_to_hir_id(def_id.expect_local()),
tcx.def_span(def_id),
RedundantLifetimeArgsList { candidate, victim },
RedundantLifetimeArgsLint { candidate, victim },
);
}
}
@ -154,7 +148,8 @@ fn check<'tcx>(tcx: TyCtxt<'tcx>, param_env: ty::ParamEnv<'tcx>, owner_id: hir::
#[derive(LintDiagnostic)]
#[diag(lint_redundant_lifetime_args)]
struct RedundantLifetimeArgsList<'tcx> {
#[note]
struct RedundantLifetimeArgsLint<'tcx> {
candidate: ty::Region<'tcx>,
victim: ty::Region<'tcx>,
}

3
tests/ui/generic-associated-types/unsatisfied-item-lifetime-bound.rs
View File

@ -1,8 +1,5 @@
#![warn(unused_lifetimes)]
pub trait X {
type Y<'a: 'static>;
//~^ WARNING unnecessary lifetime parameter
}
impl X for () {

31
tests/ui/generic-associated-types/unsatisfied-item-lifetime-bound.stderr
View File

@ -1,18 +1,5 @@
warning: unnecessary lifetime parameter `'a`
--> $DIR/unsatisfied-item-lifetime-bound.rs:4:12
|
LL | type Y<'a: 'static>;
| ^^
|
= help: you can use the `'static` lifetime directly, in place of `'a`
note: the lint level is defined here
--> $DIR/unsatisfied-item-lifetime-bound.rs:1:9
|
LL | #![warn(unused_lifetimes)]
| ^^^^^^^^^^^^^^^^
error[E0478]: lifetime bound not satisfied
--> $DIR/unsatisfied-item-lifetime-bound.rs:9:18
--> $DIR/unsatisfied-item-lifetime-bound.rs:6:18
|
LL | type Y<'a: 'static>;
| ------------------- definition of `Y` from trait
@ -21,7 +8,7 @@ LL | type Y<'a> = &'a ();
| ^^^^^^
|
note: lifetime parameter instantiated with the lifetime `'a` as defined here
--> $DIR/unsatisfied-item-lifetime-bound.rs:9:12
--> $DIR/unsatisfied-item-lifetime-bound.rs:6:12
|
LL | type Y<'a> = &'a ();
| ^^
@ -32,44 +19,44 @@ LL | type Y<'a> = &'a () where 'a: 'static;
| +++++++++++++++++
error[E0478]: lifetime bound not satisfied
--> $DIR/unsatisfied-item-lifetime-bound.rs:14:8
--> $DIR/unsatisfied-item-lifetime-bound.rs:11:8
|
LL | f: <T as X>::Y<'a>,
| ^^^^^^^^^^^^^^^
|
note: lifetime parameter instantiated with the lifetime `'a` as defined here
--> $DIR/unsatisfied-item-lifetime-bound.rs:13:10
--> $DIR/unsatisfied-item-lifetime-bound.rs:10:10
|
LL | struct B<'a, T: for<'r> X<Y<'r> = &'r ()>> {
| ^^
= note: but lifetime parameter must outlive the static lifetime
error[E0478]: lifetime bound not satisfied
--> $DIR/unsatisfied-item-lifetime-bound.rs:19:8
--> $DIR/unsatisfied-item-lifetime-bound.rs:16:8
|
LL | f: <T as X>::Y<'a>,
| ^^^^^^^^^^^^^^^
|
note: lifetime parameter instantiated with the lifetime `'a` as defined here
--> $DIR/unsatisfied-item-lifetime-bound.rs:18:10
--> $DIR/unsatisfied-item-lifetime-bound.rs:15:10
|
LL | struct C<'a, T: X> {
| ^^
= note: but lifetime parameter must outlive the static lifetime
error[E0478]: lifetime bound not satisfied
--> $DIR/unsatisfied-item-lifetime-bound.rs:24:8
--> $DIR/unsatisfied-item-lifetime-bound.rs:21:8
|
LL | f: <() as X>::Y<'a>,
| ^^^^^^^^^^^^^^^^
|
note: lifetime parameter instantiated with the lifetime `'a` as defined here
--> $DIR/unsatisfied-item-lifetime-bound.rs:23:10
--> $DIR/unsatisfied-item-lifetime-bound.rs:20:10
|
LL | struct D<'a> {
| ^^
= note: but lifetime parameter must outlive the static lifetime
error: aborting due to 4 previous errors; 1 warning emitted
error: aborting due to 4 previous errors
For more information about this error, try `rustc --explain E0478`.

4
tests/ui/regions/regions-free-region-outlives-static-outlives-free-region.rs
View File

@ -10,8 +10,8 @@
#![warn(unused_lifetimes)]
fn test<'a,'b>(x: &'a i32) -> &'b i32
where 'a: 'static //~ WARN unnecessary lifetime parameter `'a`
fn test<'a,'b>(x: &'a i32) -> &'b i32 //~ WARN unnecessary lifetime parameter `'a`
where 'a: 'static
{
x
}

8
tests/ui/regions/regions-free-region-outlives-static-outlives-free-region.stderr
View File

@ -1,10 +1,10 @@
warning: unnecessary lifetime parameter `'a`
--> $DIR/regions-free-region-outlives-static-outlives-free-region.rs:14:11
--> $DIR/regions-free-region-outlives-static-outlives-free-region.rs:13:9
|
LL | where 'a: 'static
| ^^
LL | fn test<'a,'b>(x: &'a i32) -> &'b i32
| ^^
|
= help: you can use the `'static` lifetime directly, in place of `'a`
= note: you can use the `'static` lifetime directly, in place of `'a`
note: the lint level is defined here
--> $DIR/regions-free-region-outlives-static-outlives-free-region.rs:11:9
|

7
tests/ui/regions/regions-static-bound-rpass.rs
View File

@ -3,16 +3,17 @@
#![warn(unused_lifetimes)]
fn invariant_id<'a,'b>(t: &'b mut &'static ()) -> &'b mut &'a ()
where 'a: 'static { t }
//~^ WARN unnecessary lifetime parameter `'a`
where 'a: 'static { t }
fn static_id<'a>(t: &'a ()) -> &'static ()
where 'a: 'static { t }
//~^ WARN unnecessary lifetime parameter `'a`
where 'a: 'static { t }
fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
//~^ WARN unnecessary lifetime parameter `'a`
//~| WARN unnecessary lifetime parameter `'b`
where 'a: 'b, 'b: 'static { t }
//~^ WARN unnecessary lifetime parameter `'b`
fn ref_id<'a>(t: &'a ()) -> &'a () where 'static: 'a { t }

34
tests/ui/regions/regions-static-bound-rpass.stderr
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@ -1,10 +1,10 @@
warning: unnecessary lifetime parameter `'a`
--> $DIR/regions-static-bound-rpass.rs:6:11
--> $DIR/regions-static-bound-rpass.rs:5:17
|
LL | where 'a: 'static { t }
| ^^
LL | fn invariant_id<'a,'b>(t: &'b mut &'static ()) -> &'b mut &'a ()
| ^^
|
= help: you can use the `'static` lifetime directly, in place of `'a`
= note: you can use the `'static` lifetime directly, in place of `'a`
note: the lint level is defined here
--> $DIR/regions-static-bound-rpass.rs:3:9
|
@ -12,20 +12,28 @@ LL | #![warn(unused_lifetimes)]
| ^^^^^^^^^^^^^^^^
warning: unnecessary lifetime parameter `'a`
--> $DIR/regions-static-bound-rpass.rs:10:11
--> $DIR/regions-static-bound-rpass.rs:9:14
|
LL | where 'a: 'static { t }
| ^^
LL | fn static_id<'a>(t: &'a ()) -> &'static ()
| ^^
|
= help: you can use the `'static` lifetime directly, in place of `'a`
= note: you can use the `'static` lifetime directly, in place of `'a`
warning: unnecessary lifetime parameter `'a`
--> $DIR/regions-static-bound-rpass.rs:13:23
|
LL | fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
| ^^
|
= note: you can use the `'static` lifetime directly, in place of `'a`
warning: unnecessary lifetime parameter `'b`
--> $DIR/regions-static-bound-rpass.rs:14:19
--> $DIR/regions-static-bound-rpass.rs:13:26
|
LL | where 'a: 'b, 'b: 'static { t }
| ^^
LL | fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
| ^^
|
= help: you can use the `'static` lifetime directly, in place of `'b`
= note: you can use the `'static` lifetime directly, in place of `'b`
warning: 3 warnings emitted
warning: 4 warnings emitted

5
tests/ui/regions/regions-static-bound.rs
View File

@ -1,12 +1,7 @@
#![warn(unused_lifetimes)]
fn static_id<'a,'b>(t: &'a ()) -> &'static () where 'a: 'static { t }
//~^ WARN lifetime parameter `'b` never used
//~| WARN unnecessary lifetime parameter `'a`
fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
where 'a: 'b, 'b: 'static { t }
//~^ WARN unnecessary lifetime parameter `'b`
fn static_id_wrong_way<'a>(t: &'a ()) -> &'static () where 'static: 'a {
t

38
tests/ui/regions/regions-static-bound.stderr
View File

@ -1,35 +1,5 @@
warning: lifetime parameter `'b` never used
--> $DIR/regions-static-bound.rs:3:17
|
LL | fn static_id<'a,'b>(t: &'a ()) -> &'static () where 'a: 'static { t }
| -^^
| |
| help: elide the unused lifetime
|
note: the lint level is defined here
--> $DIR/regions-static-bound.rs:1:9
|
LL | #![warn(unused_lifetimes)]
| ^^^^^^^^^^^^^^^^
warning: unnecessary lifetime parameter `'a`
--> $DIR/regions-static-bound.rs:3:53
|
LL | fn static_id<'a,'b>(t: &'a ()) -> &'static () where 'a: 'static { t }
| ^^
|
= help: you can use the `'static` lifetime directly, in place of `'a`
warning: unnecessary lifetime parameter `'b`
--> $DIR/regions-static-bound.rs:8:19
|
LL | where 'a: 'b, 'b: 'static { t }
| ^^
|
= help: you can use the `'static` lifetime directly, in place of `'b`
error: lifetime may not live long enough
--> $DIR/regions-static-bound.rs:12:5
--> $DIR/regions-static-bound.rs:7:5
|
LL | fn static_id_wrong_way<'a>(t: &'a ()) -> &'static () where 'static: 'a {
| -- lifetime `'a` defined here
@ -37,7 +7,7 @@ LL | t
| ^ returning this value requires that `'a` must outlive `'static`
error[E0521]: borrowed data escapes outside of function
--> $DIR/regions-static-bound.rs:17:5
--> $DIR/regions-static-bound.rs:12:5
|
LL | fn error(u: &(), v: &()) {
| - - let's call the lifetime of this reference `'1`
@ -50,7 +20,7 @@ LL | static_id(&u);
| argument requires that `'1` must outlive `'static`
error[E0521]: borrowed data escapes outside of function
--> $DIR/regions-static-bound.rs:19:5
--> $DIR/regions-static-bound.rs:14:5
|
LL | fn error(u: &(), v: &()) {
| - - let's call the lifetime of this reference `'2`
@ -63,6 +33,6 @@ LL | static_id_indirect(&v);
| `v` escapes the function body here
| argument requires that `'2` must outlive `'static`
error: aborting due to 3 previous errors; 3 warnings emitted
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0521`.

16
tests/ui/regions/transitively-redundant-lifetimes.rs Normal file
View File

@ -0,0 +1,16 @@
#![allow(unused)]
#![deny(unused_lifetimes)]
fn a<'a, 'b>(x: &'a &'b &'a ()) {} //~ ERROR unnecessary lifetime parameter `'b`
fn b<'a: 'b, 'b: 'a>() {} //~ ERROR unnecessary lifetime parameter `'b`
struct Foo<T: 'static>(T);
fn c<'a>(_: Foo<&'a ()>) {} //~ ERROR unnecessary lifetime parameter `'a`
struct Bar<'a>(&'a ());
impl<'a> Bar<'a> {
fn d<'b: 'a>(&'b self) {} //~ ERROR unnecessary lifetime parameter `'b`
}
fn main() {}

39
tests/ui/regions/transitively-redundant-lifetimes.stderr Normal file
View File

@ -0,0 +1,39 @@
error: unnecessary lifetime parameter `'b`
--> $DIR/transitively-redundant-lifetimes.rs:4:10
|
LL | fn a<'a, 'b>(x: &'a &'b &'a ()) {}
| ^^
|
= note: you can use the `'a` lifetime directly, in place of `'b`
note: the lint level is defined here
--> $DIR/transitively-redundant-lifetimes.rs:2:9
|
LL | #![deny(unused_lifetimes)]
| ^^^^^^^^^^^^^^^^
error: unnecessary lifetime parameter `'b`
--> $DIR/transitively-redundant-lifetimes.rs:6:14
|
LL | fn b<'a: 'b, 'b: 'a>() {}
| ^^
|
= note: you can use the `'a` lifetime directly, in place of `'b`
error: unnecessary lifetime parameter `'a`
--> $DIR/transitively-redundant-lifetimes.rs:9:6
|
LL | fn c<'a>(_: Foo<&'a ()>) {}
| ^^
|
= note: you can use the `'static` lifetime directly, in place of `'a`
error: unnecessary lifetime parameter `'b`
--> $DIR/transitively-redundant-lifetimes.rs:13:10
|
LL | fn d<'b: 'a>(&'b self) {}
| ^^
|
= note: you can use the `'a` lifetime directly, in place of `'b`
error: aborting due to 4 previous errors