Error on conflicting #[doc(inline)]/#[doc(no_inline)] attributes

compiler/rustc_passes/src/check_attr.rs

@@ -22,7 +22,7 @@ use rustc_session::lint::builtin::{
 };
 use rustc_session::parse::feature_err;
 use rustc_span::symbol::{sym, Symbol};
-use rustc_span::{Span, DUMMY_SP};
+use rustc_span::{MultiSpan, Span, DUMMY_SP};
 
 pub(crate) fn target_from_impl_item<'tcx>(
     tcx: TyCtxt<'tcx>,
@@ -67,6 +67,7 @@ impl CheckAttrVisitor<'tcx> {
         item: Option<ItemLike<'_>>,
     ) {
         let mut is_valid = true;
+        let mut specified_inline = None;
         let attrs = self.tcx.hir().attrs(hir_id);
         for attr in attrs {
             is_valid &= match attr.name_or_empty() {
@@ -77,7 +78,7 @@ impl CheckAttrVisitor<'tcx> {
                 sym::track_caller => {
                     self.check_track_caller(hir_id, &attr.span, attrs, span, target)
                 }
-                sym::doc => self.check_doc_attrs(attr, hir_id, target),
+                sym::doc => self.check_doc_attrs(attr, hir_id, target, &mut specified_inline),
                 sym::no_link => self.check_no_link(hir_id, &attr, span, target),
                 sym::export_name => self.check_export_name(hir_id, &attr, span, target),
                 sym::rustc_args_required_const => {
@@ -564,6 +565,60 @@ impl CheckAttrVisitor<'tcx> {
         true
     }
 
+    fn check_doc_inline(
+        &self,
+        attr: &Attribute,
+        meta: &NestedMetaItem,
+        hir_id: HirId,
+        target: Target,
+        specified_inline: &mut Option<(bool, Span)>,
+    ) -> bool {
+        if target == Target::Use {
+            let do_inline = meta.name_or_empty() == sym::inline;
+            if let Some((prev_inline, prev_span)) = *specified_inline {
+                if do_inline != prev_inline {
+                    let mut spans = MultiSpan::from_spans(vec![prev_span, meta.span()]);
+                    spans.push_span_label(prev_span, String::from("this attribute..."));
+                    spans.push_span_label(
+                        meta.span(),
+                        String::from("...conflicts with this attribute"),
+                    );
+                    self.tcx
+                        .sess
+                        .struct_span_err(spans, "conflicting doc inlining attributes")
+                        .help("remove one of the conflicting attributes")
+                        .emit();
+                    return false;
+                }
+                true
+            } else {
+                *specified_inline = Some((do_inline, meta.span()));
+                true
+            }
+        } else {
+            self.tcx.struct_span_lint_hir(
+                INVALID_DOC_ATTRIBUTES,
+                hir_id,
+                meta.span(),
+                |lint| {
+                    let mut err = lint.build(
+                        "this attribute can only be applied to a `use` item",
+                    );
+                    err.span_label(meta.span(), "only applicable on `use` items");
+                    if attr.style == AttrStyle::Outer {
+                        err.span_label(
+                            self.tcx.hir().span(hir_id),
+                            "not a `use` item",
+                        );
+                    }
+                    err.note("read https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#docno_inlinedocinline for more information")
+                        .emit();
+                },
+            );
+            false
+        }
+    }
+
     fn check_attr_not_crate_level(
         &self,
         meta: &NestedMetaItem,
@@ -628,7 +683,13 @@ impl CheckAttrVisitor<'tcx> {
         true
     }
 
-    fn check_doc_attrs(&self, attr: &Attribute, hir_id: HirId, target: Target) -> bool {
+    fn check_doc_attrs(
+        &self,
+        attr: &Attribute,
+        hir_id: HirId,
+        target: Target,
+        specified_inline: &mut Option<(bool, Span)>,
+    ) -> bool {
         let mut is_valid = true;
 
         if let Some(list) = attr.meta().and_then(|mi| mi.meta_item_list().map(|l| l.to_vec())) {
@@ -661,33 +722,18 @@ impl CheckAttrVisitor<'tcx> {
                             is_valid = false;
                         }
 
-                        sym::inline | sym::no_inline if target != Target::Use => {
+                        sym::inline | sym::no_inline
-                            self.tcx.struct_span_lint_hir(
+                            if !self.check_doc_inline(
-                                INVALID_DOC_ATTRIBUTES,
+                                &attr,
+                                &meta,
                                 hir_id,
-                                meta.span(),
+                                target,
-                                |lint| {
+                                specified_inline,
-                                    let mut err = lint.build(
+                            ) =>
-                                        "this attribute can only be applied to a `use` item",
+                        {
-                                    );
-                                    err.span_label(meta.span(), "only applicable on `use` items");
-                                    if attr.style == AttrStyle::Outer {
-                                        err.span_label(
-                                            self.tcx.hir().span(hir_id),
-                                            "not a `use` item",
-                                        );
-                                    }
-                                    err.note("read https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#docno_inlinedocinline for more information")
-                                        .emit();
-                                },
-                            );
                             is_valid = false;
                         }
 
-                        sym::inline | sym::no_inline => {
-                            // FIXME(#80275): conflicting inline attributes
-                        }
-
                         // no_default_passes: deprecated
                         // passes: deprecated
                         // plugins: removed, but rustdoc warns about it itself
@@ -700,10 +746,12 @@ impl CheckAttrVisitor<'tcx> {
                         | sym::html_playground_url
                         | sym::html_root_url
                         | sym::include
+                        | sym::inline
                         | sym::issue_tracker_base_url
                         | sym::keyword
                         | sym::masked
                         | sym::no_default_passes
+                        | sym::no_inline
                         | sym::notable_trait
                         | sym::passes
                         | sym::plugins

src/test/rustdoc-ui/invalid-doc-attr.rs

@@ -24,3 +24,9 @@ pub mod bar {
     //~| WARN is being phased out
     pub fn baz() {}
 }
+
+#[doc(inline)]
+#[doc(no_inline)]
+//~^^ ERROR conflicting doc inlining attributes
+//~|  HELP remove one of the conflicting attributes
+pub use bar::baz;

src/test/rustdoc-ui/invalid-doc-attr.stderr

@@ -41,6 +41,16 @@ LL |     #![doc(test(no_crate_inject))]
    = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
    = note: read https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#at-the-crate-level for more information
 
+error: conflicting doc inlining attributes
+  --> $DIR/invalid-doc-attr.rs:28:7
+   |
+LL | #[doc(inline)]
+   |       ^^^^^^ this attribute...
+LL | #[doc(no_inline)]
+   |       ^^^^^^^^^ ...conflicts with this attribute
+   |
+   = help: remove one of the conflicting attributes
+
 error: this attribute can only be applied at the crate level
   --> $DIR/invalid-doc-attr.rs:19:11
    |
@@ -64,5 +74,5 @@ LL |     pub fn baz() {}
    = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
    = note: read https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#docno_inlinedocinline for more information
 
-error: aborting due to 5 previous errors
+error: aborting due to 6 previous errors
 

src/test/ui/attributes/doc-attr2.rs

@@ -1,11 +0,0 @@
-#![crate_type = "lib"]
-#![deny(warnings)]
-
-#[doc(test(no_crate_inject))] //~ ERROR
-//~^ WARN
-pub fn foo() {}
-
-pub mod bar {
-    #![doc(test(no_crate_inject))] //~ ERROR
-    //~^ WARN
-}

src/test/ui/attributes/doc-attr2.stderr

@@ -1,26 +0,0 @@
-error: `#![doc(test(...)]` is only allowed as a crate-level attribute
-  --> $DIR/doc-attr2.rs:4:7
-   |
-LL | #[doc(test(no_crate_inject))]
-   |       ^^^^^^^^^^^^^^^^^^^^^
-   |
-note: the lint level is defined here
-  --> $DIR/doc-attr2.rs:2:9
-   |
-LL | #![deny(warnings)]
-   |         ^^^^^^^^
-   = note: `#[deny(invalid_doc_attributes)]` implied by `#[deny(warnings)]`
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
-
-error: `#![doc(test(...)]` is only allowed as a crate-level attribute
-  --> $DIR/doc-attr2.rs:9:12
-   |
-LL |     #![doc(test(no_crate_inject))]
-   |            ^^^^^^^^^^^^^^^^^^^^^
-   |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
-   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
-
-error: aborting due to 2 previous errors
-

src/test/ui/attributes/invalid-doc-attr.rs

@@ -0,0 +1,32 @@
+#![crate_type = "lib"]
+#![deny(warnings)]
+
+#[doc(test(no_crate_inject))]
+//~^ ERROR can only be applied at the crate level
+//~| WARN is being phased out
+//~| HELP to apply to the crate, use an inner attribute
+//~| SUGGESTION #![doc(test(no_crate_inject))]
+#[doc(inline)]
+//~^ ERROR can only be applied to a `use` item
+//~| WARN is being phased out
+pub fn foo() {}
+
+pub mod bar {
+    #![doc(test(no_crate_inject))]
+    //~^ ERROR can only be applied at the crate level
+    //~| WARN is being phased out
+
+    #[doc(test(no_crate_inject))]
+    //~^ ERROR can only be applied at the crate level
+    //~| WARN is being phased out
+    #[doc(inline)]
+    //~^ ERROR can only be applied to a `use` item
+    //~| WARN is being phased out
+    pub fn baz() {}
+}
+
+#[doc(inline)]
+#[doc(no_inline)]
+//~^^ ERROR conflicting doc inlining attributes
+//~|  HELP remove one of the conflicting attributes
+pub use bar::baz;

src/test/ui/attributes/invalid-doc-attr.stderr

@@ -0,0 +1,78 @@
+error: this attribute can only be applied at the crate level
+  --> $DIR/invalid-doc-attr.rs:4:7
+   |
+LL | #[doc(test(no_crate_inject))]
+   |       ^^^^^^^^^^^^^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/invalid-doc-attr.rs:2:9
+   |
+LL | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(invalid_doc_attributes)]` implied by `#[deny(warnings)]`
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
+   = note: read https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#at-the-crate-level for more information
+help: to apply to the crate, use an inner attribute
+   |
+LL | #![doc(test(no_crate_inject))]
+   |
+
+error: this attribute can only be applied to a `use` item
+  --> $DIR/invalid-doc-attr.rs:9:7
+   |
+LL | #[doc(inline)]
+   |       ^^^^^^ only applicable on `use` items
+...
+LL | pub fn foo() {}
+   | ------------ not a `use` item
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
+   = note: read https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#docno_inlinedocinline for more information
+
+error: this attribute can only be applied at the crate level
+  --> $DIR/invalid-doc-attr.rs:15:12
+   |
+LL |     #![doc(test(no_crate_inject))]
+   |            ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
+   = note: read https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#at-the-crate-level for more information
+
+error: conflicting doc inlining attributes
+  --> $DIR/invalid-doc-attr.rs:28:7
+   |
+LL | #[doc(inline)]
+   |       ^^^^^^ this attribute...
+LL | #[doc(no_inline)]
+   |       ^^^^^^^^^ ...conflicts with this attribute
+   |
+   = help: remove one of the conflicting attributes
+
+error: this attribute can only be applied at the crate level
+  --> $DIR/invalid-doc-attr.rs:19:11
+   |
+LL |     #[doc(test(no_crate_inject))]
+   |           ^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
+   = note: read https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#at-the-crate-level for more information
+
+error: this attribute can only be applied to a `use` item
+  --> $DIR/invalid-doc-attr.rs:22:11
+   |
+LL |     #[doc(inline)]
+   |           ^^^^^^ only applicable on `use` items
+...
+LL |     pub fn baz() {}
+   |     ------------ not a `use` item
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #82730 <https://github.com/rust-lang/rust/issues/82730>
+   = note: read https://doc.rust-lang.org/nightly/rustdoc/the-doc-attribute.html#docno_inlinedocinline for more information
+
+error: aborting due to 6 previous errors
+