Rollup merge of #77469 - camelid:rustdoc-better-failed-res-error, r=jyn514

Improve rustdoc error for failed intra-doc link resolution

The previous error was confusing since it made it sound like you can't
link to items that are defined outside the current module.

Also suggested importing the item.

r? @jyn514

Author: Dylan-DPC

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -1576,22 +1576,27 @@ fn resolution_failure(
                     };
                     // See if this was a module: `[path]` or `[std::io::nope]`
                     if let Some(module) = last_found_module {
-                        let module_name = collector.cx.tcx.item_name(module);
-                        let note = format!(
-                            "the module `{}` contains no item named `{}`",
-                            module_name, unresolved
-                        );
+                        let note = if partial_res.is_some() {
+                            // Part of the link resolved; e.g. `std::io::nonexistent`
+                            let module_name = collector.cx.tcx.item_name(module);
+                            format!("no item named `{}` in module `{}`", unresolved, module_name)
+                        } else {
+                            // None of the link resolved; e.g. `Notimported`
+                            format!("no item named `{}` in scope", unresolved)
+                        };
                         if let Some(span) = sp {
                             diag.span_label(span, &note);
                         } else {
                             diag.note(&note);
                         }
+
                         // If the link has `::` in it, assume it was meant to be an intra-doc link.
                         // Otherwise, the `[]` might be unrelated.
                         // FIXME: don't show this for autolinks (`<>`), `()` style links, or reference links
                         if !path_str.contains("::") {
                             diag.help(r#"to escape `[` and `]` characters, add '\' before them like `\[` or `\]`"#);
                         }
+
                         continue;
                     }
 

src/test/rustdoc-ui/deny-intra-link-resolution-failure.stderr

@@ -2,7 +2,7 @@ error: unresolved link to `v2`
   --> $DIR/deny-intra-link-resolution-failure.rs:3:6
    |
 LL | /// [v2]
-   |      ^^ the module `deny_intra_link_resolution_failure` contains no item named `v2`
+   |      ^^ no item named `v2` in scope
    |
 note: the lint level is defined here
   --> $DIR/deny-intra-link-resolution-failure.rs:1:9

src/test/rustdoc-ui/intra-link-errors.rs

@@ -6,23 +6,23 @@
 
 /// [path::to::nonexistent::module]
 //~^ ERROR unresolved link
-//~| NOTE `intra_link_errors` contains no item named `path`
+//~| NOTE no item named `path` in scope
 
 /// [path::to::nonexistent::macro!]
 //~^ ERROR unresolved link
-//~| NOTE `intra_link_errors` contains no item named `path`
+//~| NOTE no item named `path` in scope
 
 /// [type@path::to::nonexistent::type]
 //~^ ERROR unresolved link
-//~| NOTE `intra_link_errors` contains no item named `path`
+//~| NOTE no item named `path` in scope
 
 /// [std::io::not::here]
 //~^ ERROR unresolved link
-//~| NOTE `io` contains no item named `not`
+//~| NOTE no item named `not` in module `io`
 
 /// [type@std::io::not::here]
 //~^ ERROR unresolved link
-//~| NOTE `io` contains no item named `not`
+//~| NOTE no item named `not` in module `io`
 
 /// [std::io::Error::x]
 //~^ ERROR unresolved link

src/test/rustdoc-ui/intra-link-errors.stderr

@@ -2,7 +2,7 @@ error: unresolved link to `path::to::nonexistent::module`
   --> $DIR/intra-link-errors.rs:7:6
    |
 LL | /// [path::to::nonexistent::module]
-   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the module `intra_link_errors` contains no item named `path`
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no item named `path` in scope
    |
 note: the lint level is defined here
   --> $DIR/intra-link-errors.rs:1:9
@@ -14,25 +14,25 @@ error: unresolved link to `path::to::nonexistent::macro`
   --> $DIR/intra-link-errors.rs:11:6
    |
 LL | /// [path::to::nonexistent::macro!]
-   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the module `intra_link_errors` contains no item named `path`
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no item named `path` in scope
 
 error: unresolved link to `path::to::nonexistent::type`
   --> $DIR/intra-link-errors.rs:15:6
    |
 LL | /// [type@path::to::nonexistent::type]
-   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the module `intra_link_errors` contains no item named `path`
+   |      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no item named `path` in scope
 
 error: unresolved link to `std::io::not::here`
   --> $DIR/intra-link-errors.rs:19:6
    |
 LL | /// [std::io::not::here]
-   |      ^^^^^^^^^^^^^^^^^^ the module `io` contains no item named `not`
+   |      ^^^^^^^^^^^^^^^^^^ no item named `not` in module `io`
 
 error: unresolved link to `std::io::not::here`
   --> $DIR/intra-link-errors.rs:23:6
    |
 LL | /// [type@std::io::not::here]
-   |      ^^^^^^^^^^^^^^^^^^^^^^^ the module `io` contains no item named `not`
+   |      ^^^^^^^^^^^^^^^^^^^^^^^ no item named `not` in module `io`
 
 error: unresolved link to `std::io::Error::x`
   --> $DIR/intra-link-errors.rs:27:6

src/test/rustdoc-ui/intra-link-span-ice-55723.stderr

@@ -2,7 +2,7 @@ error: unresolved link to `i`
   --> $DIR/intra-link-span-ice-55723.rs:9:10
    |
 LL | /// （arr[i]）
-   |           ^ the module `intra_link_span_ice_55723` contains no item named `i`
+   |           ^ no item named `i` in scope
    |
 note: the lint level is defined here
   --> $DIR/intra-link-span-ice-55723.rs:1:9

src/test/rustdoc-ui/intra-links-warning-crlf.stderr

@@ -2,7 +2,7 @@ warning: unresolved link to `error`
   --> $DIR/intra-links-warning-crlf.rs:7:6
    |
 LL | /// [error]
-   |      ^^^^^ the module `intra_links_warning_crlf` contains no item named `error`
+   |      ^^^^^ no item named `error` in scope
    |
    = note: `#[warn(broken_intra_doc_links)]` on by default
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
@@ -11,23 +11,23 @@ warning: unresolved link to `error1`
   --> $DIR/intra-links-warning-crlf.rs:12:11
    |
 LL | /// docs [error1]
-   |           ^^^^^^ the module `intra_links_warning_crlf` contains no item named `error1`
+   |           ^^^^^^ no item named `error1` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `error2`
   --> $DIR/intra-links-warning-crlf.rs:15:11
    |
 LL | /// docs [error2]
-   |           ^^^^^^ the module `intra_links_warning_crlf` contains no item named `error2`
+   |           ^^^^^^ no item named `error2` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `error`
   --> $DIR/intra-links-warning-crlf.rs:23:20
    |
 LL |  * It also has an [error].
-   |                    ^^^^^ the module `intra_links_warning_crlf` contains no item named `error`
+   |                    ^^^^^ no item named `error` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 

src/test/rustdoc-ui/intra-links-warning.stderr

@@ -10,53 +10,53 @@ warning: unresolved link to `Bar::foo`
   --> $DIR/intra-links-warning.rs:3:35
    |
 LL |        //! Test with [Foo::baz], [Bar::foo], ...
-   |                                   ^^^^^^^^ the module `intra_links_warning` contains no item named `Bar`
+   |                                   ^^^^^^^^ no item named `Bar` in scope
 
 warning: unresolved link to `Uniooon::X`
   --> $DIR/intra-links-warning.rs:6:13
    |
 LL |      //! , [Uniooon::X] and [Qux::Z].
-   |             ^^^^^^^^^^ the module `intra_links_warning` contains no item named `Uniooon`
+   |             ^^^^^^^^^^ no item named `Uniooon` in scope
 
 warning: unresolved link to `Qux::Z`
   --> $DIR/intra-links-warning.rs:6:30
    |
 LL |      //! , [Uniooon::X] and [Qux::Z].
-   |                              ^^^^^^ the module `intra_links_warning` contains no item named `Qux`
+   |                              ^^^^^^ no item named `Qux` in scope
 
 warning: unresolved link to `Uniooon::X`
   --> $DIR/intra-links-warning.rs:10:14
    |
 LL |       //! , [Uniooon::X] and [Qux::Z].
-   |              ^^^^^^^^^^ the module `intra_links_warning` contains no item named `Uniooon`
+   |              ^^^^^^^^^^ no item named `Uniooon` in scope
 
 warning: unresolved link to `Qux::Z`
   --> $DIR/intra-links-warning.rs:10:31
    |
 LL |       //! , [Uniooon::X] and [Qux::Z].
-   |                               ^^^^^^ the module `intra_links_warning` contains no item named `Qux`
+   |                               ^^^^^^ no item named `Qux` in scope
 
 warning: unresolved link to `Qux:Y`
   --> $DIR/intra-links-warning.rs:14:13
    |
 LL |        /// [Qux:Y]
-   |             ^^^^^ the module `intra_links_warning` contains no item named `Qux:Y`
+   |             ^^^^^ no item named `Qux:Y` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `error`
   --> $DIR/intra-links-warning.rs:58:30
    |
 LL |  * time to introduce a link [error]*/
-   |                              ^^^^^ the module `intra_links_warning` contains no item named `error`
+   |                              ^^^^^ no item named `error` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `error`
   --> $DIR/intra-links-warning.rs:64:30
    |
 LL |  * time to introduce a link [error]
-   |                              ^^^^^ the module `intra_links_warning` contains no item named `error`
+   |                              ^^^^^ no item named `error` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
@@ -70,7 +70,7 @@ LL | #[doc = "single line [error]"]
 
            single line [error]
                         ^^^^^
-   = note: the module `intra_links_warning` contains no item named `error`
+   = note: no item named `error` in scope
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `error`
@@ -83,7 +83,7 @@ LL | #[doc = "single line with \"escaping\" [error]"]
 
            single line with "escaping" [error]
                                         ^^^^^
-   = note: the module `intra_links_warning` contains no item named `error`
+   = note: no item named `error` in scope
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `error`
@@ -98,46 +98,46 @@ LL | | /// [error]
 
            [error]
             ^^^^^
-   = note: the module `intra_links_warning` contains no item named `error`
+   = note: no item named `error` in scope
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `error1`
   --> $DIR/intra-links-warning.rs:80:11
    |
 LL | /// docs [error1]
-   |           ^^^^^^ the module `intra_links_warning` contains no item named `error1`
+   |           ^^^^^^ no item named `error1` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `error2`
   --> $DIR/intra-links-warning.rs:82:11
    |
 LL | /// docs [error2]
-   |           ^^^^^^ the module `intra_links_warning` contains no item named `error2`
+   |           ^^^^^^ no item named `error2` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `BarA`
   --> $DIR/intra-links-warning.rs:21:10
    |
 LL | /// bar [BarA] bar
-   |          ^^^^ the module `intra_links_warning` contains no item named `BarA`
+   |          ^^^^ no item named `BarA` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `BarB`
   --> $DIR/intra-links-warning.rs:27:9
    |
 LL |  * bar [BarB] bar
-   |         ^^^^ the module `intra_links_warning` contains no item named `BarB`
+   |         ^^^^ no item named `BarB` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `BarC`
   --> $DIR/intra-links-warning.rs:34:6
    |
 LL | bar [BarC] bar
-   |      ^^^^ the module `intra_links_warning` contains no item named `BarC`
+   |      ^^^^ no item named `BarC` in scope
    |
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
@@ -151,7 +151,7 @@ LL | #[doc = "Foo\nbar [BarD] bar\nbaz"]
 
            bar [BarD] bar
                 ^^^^
-   = note: the module `intra_links_warning` contains no item named `BarD`
+   = note: no item named `BarD` in scope
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
 
 warning: unresolved link to `BarF`
@@ -167,7 +167,7 @@ LL | f!("Foo\nbar [BarF] bar\nbaz");
 
            bar [BarF] bar
                 ^^^^
-   = note: the module `intra_links_warning` contains no item named `BarF`
+   = note: no item named `BarF` in scope
    = help: to escape `[` and `]` characters, add '\' before them like `\[` or `\]`
    = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 

src/test/rustdoc-ui/lint-group.stderr

@@ -32,7 +32,7 @@ error: unresolved link to `error`
   --> $DIR/lint-group.rs:9:29
    |
 LL | /// what up, let's make an [error]
-   |                             ^^^^^ the module `lint_group` contains no item named `error`
+   |                             ^^^^^ no item named `error` in scope
    |
 note: the lint level is defined here
   --> $DIR/lint-group.rs:7:9