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matthiaskrgrmatthiaskrgr
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Rollup merge of rust-lang#133823 - estebank:issue-56328, r=petrochenkov
Use `cfg_attr_trace` in AST with a placeholder attribute for accurate suggestion In rust-lang#138515, we insert a placeholder attribute so that checks for attributes can still know about the placement of `cfg` attributes. When we suggest removing items with `cfg_attr`s (fix rust-lang#56328) and make them verbose. We tweak the wording of the existing "unused `extern crate`" lint. ``` warning: unused `extern crate` --> $DIR/removing-extern-crate.rs:9:1 | LL | extern crate removing_extern_crate as foo; | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unused | note: the lint level is defined here --> $DIR/removing-extern-crate.rs:6:9 | LL | #![warn(rust_2018_idioms)] | ^^^^^^^^^^^^^^^^ = note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]` help: remove the unused `extern crate` | LL - #[cfg_attr(test, macro_use)] LL - extern crate removing_extern_crate as foo; | ``` r? `@petrochenkov` try-job: x86_64-gnu-aux
2 parents 1ac1950 + f80e3ac commit 7aba37d

18 files changed

+227
-27
lines changed

‎compiler/rustc_lint/messages.ftl

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -960,7 +960,8 @@ lint_unused_doc_comment = unused doc comment
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.help = to document an item produced by a macro, the macro must produce the documentation as part of its expansion
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lint_unused_extern_crate = unused extern crate
963-
.suggestion = remove it
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.label = unused
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.suggestion = remove the unused `extern crate`
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lint_unused_import_braces = braces around {$node} is unnecessary
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‎compiler/rustc_lint/src/early/diagnostics.rs

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -292,8 +292,8 @@ pub fn decorate_builtin_lint(
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BuiltinLintDiag::ByteSliceInPackedStructWithDerive { ty } => {
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lints::ByteSliceInPackedStructWithDerive { ty }.decorate_lint(diag);
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}
295-
BuiltinLintDiag::UnusedExternCrate { removal_span } => {
296-
lints::UnusedExternCrate { removal_span }.decorate_lint(diag);
295+
BuiltinLintDiag::UnusedExternCrate { span, removal_span } => {
296+
lints::UnusedExternCrate { span, removal_span }.decorate_lint(diag);
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}
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BuiltinLintDiag::ExternCrateNotIdiomatic { vis_span, ident_span } => {
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let suggestion_span = vis_span.between(ident_span);

‎compiler/rustc_lint/src/lints.rs

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3077,7 +3077,9 @@ pub(crate) struct ByteSliceInPackedStructWithDerive {
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#[derive(LintDiagnostic)]
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#[diag(lint_unused_extern_crate)]
30793079
pub(crate) struct UnusedExternCrate {
3080-
#[suggestion(code = "", applicability = "machine-applicable")]
3080+
#[label]
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pub span: Span,
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#[suggestion(code = "", applicability = "machine-applicable", style = "verbose")]
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pub removal_span: Span,
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}
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‎compiler/rustc_lint_defs/src/lib.rs

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Original file line numberDiff line numberDiff line change
@@ -736,6 +736,7 @@ pub enum BuiltinLintDiag {
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ty: String,
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},
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UnusedExternCrate {
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span: Span,
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removal_span: Span,
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},
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ExternCrateNotIdiomatic {

‎compiler/rustc_resolve/src/check_unused.rs

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Original file line numberDiff line numberDiff line change
@@ -154,6 +154,7 @@ impl<'a, 'ra, 'tcx> UnusedImportCheckVisitor<'a, 'ra, 'tcx> {
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extern_crate.id,
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span,
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BuiltinLintDiag::UnusedExternCrate {
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span: extern_crate.span,
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removal_span: extern_crate.span_with_attributes,
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},
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);

‎tests/ui/editions/edition-extern-crate-allowed.stderr

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2,14 +2,18 @@ warning: unused extern crate
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--> $DIR/edition-extern-crate-allowed.rs:7:1
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|
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LL | extern crate edition_extern_crate_allowed;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unused
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|
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note: the lint level is defined here
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--> $DIR/edition-extern-crate-allowed.rs:5:9
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|
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LL | #![warn(rust_2018_idioms)]
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| ^^^^^^^^^^^^^^^^
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= note: `#[warn(unused_extern_crates)]` implied by `#[warn(rust_2018_idioms)]`
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help: remove the unused `extern crate`
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|
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LL - extern crate edition_extern_crate_allowed;
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|
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warning: 1 warning emitted
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‎tests/ui/imports/extern-crate-used.stderr

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2,13 +2,18 @@ error: unused extern crate
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--> $DIR/extern-crate-used.rs:18:1
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LL | extern crate core;
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| ^^^^^^^^^^^^^^^^^^ help: remove it
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| ^^^^^^^^^^^^^^^^^^ unused
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note: the lint level is defined here
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--> $DIR/extern-crate-used.rs:6:9
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LL | #![deny(unused_extern_crates)]
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| ^^^^^^^^^^^^^^^^^^^^
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help: remove the unused `extern crate`
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|
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LL - extern crate core;
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LL +
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|
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1318
error: aborting due to 1 previous error
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‎tests/ui/lint/unnecessary-extern-crate.stderr

Lines changed: 35 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -2,43 +2,72 @@ error: unused extern crate
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--> $DIR/unnecessary-extern-crate.rs:6:1
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LL | extern crate core;
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| ^^^^^^^^^^^^^^^^^^ help: remove it
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| ^^^^^^^^^^^^^^^^^^ unused
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|
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note: the lint level is defined here
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--> $DIR/unnecessary-extern-crate.rs:3:9
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|
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LL | #![deny(unused_extern_crates)]
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| ^^^^^^^^^^^^^^^^^^^^
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help: remove the unused `extern crate`
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|
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LL - extern crate core;
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|
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error: unused extern crate
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--> $DIR/unnecessary-extern-crate.rs:9:1
1519
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LL | extern crate core as x;
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| ^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
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| ^^^^^^^^^^^^^^^^^^^^^^^ unused
22+
|
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help: remove the unused `extern crate`
24+
|
25+
LL - extern crate core as x;
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|
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error: unused extern crate
2029
--> $DIR/unnecessary-extern-crate.rs:31:5
2130
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LL | extern crate core;
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| ^^^^^^^^^^^^^^^^^^ help: remove it
32+
| ^^^^^^^^^^^^^^^^^^ unused
33+
|
34+
help: remove the unused `extern crate`
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|
36+
LL - extern crate core;
37+
|
2438

2539
error: unused extern crate
2640
--> $DIR/unnecessary-extern-crate.rs:35:5
2741
|
2842
LL | extern crate core as x;
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| ^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
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| ^^^^^^^^^^^^^^^^^^^^^^^ unused
44+
|
45+
help: remove the unused `extern crate`
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|
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LL - extern crate core as x;
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|
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error: unused extern crate
3251
--> $DIR/unnecessary-extern-crate.rs:44:9
3352
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3453
LL | extern crate core;
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| ^^^^^^^^^^^^^^^^^^ help: remove it
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| ^^^^^^^^^^^^^^^^^^ unused
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|
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help: remove the unused `extern crate`
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|
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LL - extern crate core;
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|
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3761
error: unused extern crate
3862
--> $DIR/unnecessary-extern-crate.rs:48:9
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LL | extern crate core as x;
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| ^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
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| ^^^^^^^^^^^^^^^^^^^^^^^ unused
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|
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help: remove the unused `extern crate`
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|
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LL - extern crate core as x;
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|
4271

4372
error: aborting due to 6 previous errors
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‎tests/ui/lint/unused/lint-unused-extern-crate.stderr

Lines changed: 13 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -2,19 +2,30 @@ error: unused extern crate
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--> $DIR/lint-unused-extern-crate.rs:11:1
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44
LL | extern crate lint_unused_extern_crate5;
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
5+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unused
66
|
77
note: the lint level is defined here
88
--> $DIR/lint-unused-extern-crate.rs:7:9
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|
1010
LL | #![deny(unused_extern_crates)]
1111
| ^^^^^^^^^^^^^^^^^^^^
12+
help: remove the unused `extern crate`
13+
|
14+
LL - extern crate lint_unused_extern_crate5;
15+
LL +
16+
|
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1318
error: unused extern crate
1419
--> $DIR/lint-unused-extern-crate.rs:29:5
1520
|
1621
LL | extern crate lint_unused_extern_crate2;
17-
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
22+
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unused
23+
|
24+
help: remove the unused `extern crate`
25+
|
26+
LL - extern crate lint_unused_extern_crate2;
27+
LL +
28+
|
1829

1930
error: aborting due to 2 previous errors
2031

‎tests/ui/proc-macro/no-macro-use-attr.stderr

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2,13 +2,17 @@ warning: unused extern crate
22
--> $DIR/no-macro-use-attr.rs:6:1
33
|
44
LL | extern crate test_macros;
5-
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove it
5+
| ^^^^^^^^^^^^^^^^^^^^^^^^^ unused
66
|
77
note: the lint level is defined here
88
--> $DIR/no-macro-use-attr.rs:4:9
99
|
1010
LL | #![warn(unused_extern_crates)]
1111
| ^^^^^^^^^^^^^^^^^^^^
12+
help: remove the unused `extern crate`
13+
|
14+
LL - extern crate test_macros;
15+
|
1216

1317
warning: 1 warning emitted
1418

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