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Don't warn on fields in the unreachable_pub lint
1 parent a83cf56 commit 89d86ae

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3 files changed

+34
-29
lines changed

3 files changed

+34
-29
lines changed

‎compiler/rustc_lint/src/builtin.rs

+15-6
Original file line numberDiff line numberDiff line change
@@ -51,7 +51,7 @@ use rustc_hir as hir;
5151
use rustc_hir::def::{DefKind, Res};
5252
use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID};
5353
use rustc_hir::intravisit::FnKind as HirFnKind;
54-
use rustc_hir::{Body, FnDecl, GenericParamKind, Node, PatKind, PredicateOrigin};
54+
use rustc_hir::{Body, FnDecl, GenericParamKind, PatKind, PredicateOrigin};
5555
use rustc_middle::bug;
5656
use rustc_middle::lint::in_external_macro;
5757
use rustc_middle::ty::layout::LayoutOf;
@@ -1423,11 +1423,20 @@ impl<'tcx> LateLintPass<'tcx> for UnreachablePub {
14231423
self.perform_lint(cx, "item", foreign_item.owner_id.def_id, foreign_item.vis_span, true);
14241424
}
14251425

1426-
fn check_field_def(&mut self, cx: &LateContext<'_>, field: &hir::FieldDef<'_>) {
1427-
if matches!(cx.tcx.parent_hir_node(field.hir_id), Node::Variant(_)) {
1428-
return;
1429-
}
1430-
self.perform_lint(cx, "field", field.def_id, field.vis_span, false);
1426+
fn check_field_def(&mut self, _cx: &LateContext<'_>, _field: &hir::FieldDef<'_>) {
1427+
// - If an ADT definition is reported then we don't need to check fields
1428+
// (as it would add unnecessary complexity to the source code, the struct
1429+
// definition is in the immediate proximity to give the "real" visibility).
1430+
// - If an ADT is not reported because it's not `pub` - we don't need to
1431+
// check fields.
1432+
// - If an ADT is not reported because it's reachable - we also don't need
1433+
// to check fields because then they are reachable by construction if they
1434+
// are pub.
1435+
//
1436+
// Therefore in no case we check the fields.
1437+
//
1438+
// cf. https://github.com/rust-lang/rust/pull/126013#issuecomment-2152839205
1439+
// cf. https://github.com/rust-lang/rust/pull/126040#issuecomment-2152944506
14311440
}
14321441

14331442
fn check_impl_item(&mut self, cx: &LateContext<'_>, impl_item: &hir::ImplItem<'_>) {

‎tests/ui/lint/unreachable_pub.rs

+7-3
Original file line numberDiff line numberDiff line change
@@ -9,12 +9,16 @@ mod private_mod {
99
pub use std::env::{Args}; // braced-use has different item spans than unbraced
1010
//~^ WARNING unreachable_pub
1111

12+
// we lint on struct definition
1213
pub struct Hydrogen { //~ WARNING unreachable_pub
13-
// `pub` struct fields, too
14-
pub neutrons: usize, //~ WARNING unreachable_pub
15-
// (... but not more-restricted fields)
14+
// but not on fields, even if they are `pub` as putting `pub(crate)`
15+
// it would clutter the source code for little value
16+
pub neutrons: usize,
1617
pub(crate) electrons: usize
1718
}
19+
pub(crate) struct Calcium {
20+
pub neutrons: usize,
21+
}
1822
impl Hydrogen {
1923
// impls, too
2024
pub fn count_neutrons(&self) -> usize { self.neutrons } //~ WARNING unreachable_pub

‎tests/ui/lint/unreachable_pub.stderr

+12-20
Original file line numberDiff line numberDiff line change
@@ -24,7 +24,7 @@ LL | pub use std::env::{Args}; // braced-use has different item spans than u
2424
= help: or consider exporting it for use by other crates
2525

2626
warning: unreachable `pub` item
27-
--> $DIR/unreachable_pub.rs:12:5
27+
--> $DIR/unreachable_pub.rs:13:5
2828
|
2929
LL | pub struct Hydrogen {
3030
| ---^^^^^^^^^^^^^^^^
@@ -33,24 +33,16 @@ LL | pub struct Hydrogen {
3333
|
3434
= help: or consider exporting it for use by other crates
3535

36-
warning: unreachable `pub` field
37-
--> $DIR/unreachable_pub.rs:14:9
38-
|
39-
LL | pub neutrons: usize,
40-
| ---^^^^^^^^^^^^^^^^
41-
| |
42-
| help: consider restricting its visibility: `pub(crate)`
43-
4436
warning: unreachable `pub` item
45-
--> $DIR/unreachable_pub.rs:20:9
37+
--> $DIR/unreachable_pub.rs:24:9
4638
|
4739
LL | pub fn count_neutrons(&self) -> usize { self.neutrons }
4840
| ---^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
4941
| |
5042
| help: consider restricting its visibility: `pub(crate)`
5143

5244
warning: unreachable `pub` item
53-
--> $DIR/unreachable_pub.rs:29:5
45+
--> $DIR/unreachable_pub.rs:33:5
5446
|
5547
LL | pub enum Helium {}
5648
| ---^^^^^^^^^^^^
@@ -60,7 +52,7 @@ LL | pub enum Helium {}
6052
= help: or consider exporting it for use by other crates
6153

6254
warning: unreachable `pub` item
63-
--> $DIR/unreachable_pub.rs:30:5
55+
--> $DIR/unreachable_pub.rs:34:5
6456
|
6557
LL | pub union Lithium { c1: usize, c2: u8 }
6658
| ---^^^^^^^^^^^^^^
@@ -70,7 +62,7 @@ LL | pub union Lithium { c1: usize, c2: u8 }
7062
= help: or consider exporting it for use by other crates
7163

7264
warning: unreachable `pub` item
73-
--> $DIR/unreachable_pub.rs:31:5
65+
--> $DIR/unreachable_pub.rs:35:5
7466
|
7567
LL | pub fn beryllium() {}
7668
| ---^^^^^^^^^^^^^^^
@@ -80,7 +72,7 @@ LL | pub fn beryllium() {}
8072
= help: or consider exporting it for use by other crates
8173

8274
warning: unreachable `pub` item
83-
--> $DIR/unreachable_pub.rs:32:5
75+
--> $DIR/unreachable_pub.rs:36:5
8476
|
8577
LL | pub trait Boron {}
8678
| ---^^^^^^^^^^^^
@@ -90,7 +82,7 @@ LL | pub trait Boron {}
9082
= help: or consider exporting it for use by other crates
9183

9284
warning: unreachable `pub` item
93-
--> $DIR/unreachable_pub.rs:33:5
85+
--> $DIR/unreachable_pub.rs:37:5
9486
|
9587
LL | pub const CARBON: usize = 1;
9688
| ---^^^^^^^^^^^^^^^^^^^^
@@ -100,7 +92,7 @@ LL | pub const CARBON: usize = 1;
10092
= help: or consider exporting it for use by other crates
10193

10294
warning: unreachable `pub` item
103-
--> $DIR/unreachable_pub.rs:34:5
95+
--> $DIR/unreachable_pub.rs:38:5
10496
|
10597
LL | pub static NITROGEN: usize = 2;
10698
| ---^^^^^^^^^^^^^^^^^^^^^^^
@@ -110,7 +102,7 @@ LL | pub static NITROGEN: usize = 2;
110102
= help: or consider exporting it for use by other crates
111103

112104
warning: unreachable `pub` item
113-
--> $DIR/unreachable_pub.rs:35:5
105+
--> $DIR/unreachable_pub.rs:39:5
114106
|
115107
LL | pub type Oxygen = bool;
116108
| ---^^^^^^^^^^^^
@@ -120,7 +112,7 @@ LL | pub type Oxygen = bool;
120112
= help: or consider exporting it for use by other crates
121113

122114
warning: unreachable `pub` item
123-
--> $DIR/unreachable_pub.rs:38:47
115+
--> $DIR/unreachable_pub.rs:42:47
124116
|
125117
LL | ($visibility: vis, $name: ident) => { $visibility struct $name {} }
126118
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -135,7 +127,7 @@ LL | define_empty_struct_with_visibility!(pub, Fluorine);
135127
= note: this warning originates in the macro `define_empty_struct_with_visibility` (in Nightly builds, run with -Z macro-backtrace for more info)
136128

137129
warning: unreachable `pub` item
138-
--> $DIR/unreachable_pub.rs:44:9
130+
--> $DIR/unreachable_pub.rs:48:9
139131
|
140132
LL | pub fn catalyze() -> bool;
141133
| ---^^^^^^^^^^^^^^^^^^^^^^
@@ -144,5 +136,5 @@ LL | pub fn catalyze() -> bool;
144136
|
145137
= help: or consider exporting it for use by other crates
146138

147-
warning: 14 warnings emitted
139+
warning: 13 warnings emitted
148140

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