Rollup merge of rust-lang#84950 - pietroalbini:revert-3478f83c0, r=Mark-Simulacrum

Revert PR 83866

rust-lang#83866 caused multiple test failures when Rust's channel is changed from nightly to anything else. The PR will have to be landed again after the test suite is fixed.

The two kinds of test failures were:

* Rustdoc tests failed because the links in the generated HTML didn't point at nightly anymore, see rust-lang#84909 (comment)
* Rustdoc UI tests failed because the links included in error messages didn't point at nightly anymore, see rust-lang#84909 (comment)

r? `@Mark-Simulacrum`
cc `@jyn514`

Author: Dylan-DPC

src/librustdoc/clean/types.rs

@@ -517,10 +517,9 @@ impl Item {
                                 Some(ExternalLocation::Remote(ref s)) => {
                                     format!("{}/std/", s.trim_end_matches('/'))
                                 }
-                                Some(ExternalLocation::Unknown) | None => format!(
-                                    "https://doc.rust-lang.org/{}/std/",
-                                    crate::doc_rust_lang_org_channel(),
-                                ),
+                                Some(ExternalLocation::Unknown) | None => {
+                                    "https://doc.rust-lang.org/nightly/std/".to_string()
+                                }
                             };
                             // This is a primitive so the url is done "by hand".
                             let tail = fragment.find('#').unwrap_or_else(|| fragment.len());

src/librustdoc/clean/utils.rs

@@ -542,14 +542,3 @@ crate fn has_doc_flag(attrs: ty::Attributes<'_>, flag: Symbol) -> bool {
             && attr.meta_item_list().map_or(false, |l| rustc_attr::list_contains_name(&l, flag))
     })
 }
-
-/// Return a channel suitable for using in a `doc.rust-lang.org/{channel}` format string.
-crate fn doc_rust_lang_org_channel() -> &'static str {
-    match env!("CFG_RELEASE_CHANNEL") {
-        "stable" => env!("CFG_RELEASE_NUM"),
-        "beta" => "beta",
-        "nightly" | "dev" => "nightly",
-        // custom build of rustdoc maybe? link to the stable docs just in case
-        _ => "",
-    }
-}

src/librustdoc/core.rs

@@ -406,18 +406,15 @@ crate fn run_global_ctxt(
     let mut krate = tcx.sess.time("clean_crate", || clean::krate(&mut ctxt));
 
     if krate.module.doc_value().map(|d| d.is_empty()).unwrap_or(true) {
-        let help = format!(
-            "The following guide may be of use:\n\
-            https://doc.rust-lang.org/{}/rustdoc/how-to-write-documentation.html",
-            crate::doc_rust_lang_org_channel(),
-        );
+        let help = "The following guide may be of use:\n\
+                https://doc.rust-lang.org/nightly/rustdoc/how-to-write-documentation.html";
         tcx.struct_lint_node(
             crate::lint::MISSING_CRATE_LEVEL_DOCS,
             DocContext::as_local_hir_id(tcx, krate.module.def_id).unwrap(),
             |lint| {
                 let mut diag =
                     lint.build("no documentation found for this crate's top-level module");
-                diag.help(&help);
+                diag.help(help);
                 diag.emit();
             },
         );

src/librustdoc/lib.rs

@@ -82,8 +82,6 @@ use rustc_session::config::{make_crate_type_option, ErrorOutputType, RustcOptGro
 use rustc_session::getopts;
 use rustc_session::{early_error, early_warn};
 
-use crate::clean::utils::doc_rust_lang_org_channel;
-
 /// A macro to create a FxHashMap.
 ///
 /// Example:
@@ -606,10 +604,7 @@ fn usage(argv0: &str) {
     }
     println!("{}", options.usage(&format!("{} [options] <input>", argv0)));
     println!("    @path               Read newline separated options from `path`\n");
-    println!(
-        "More information available at https://doc.rust-lang.org/{}/rustdoc/what-is-rustdoc.html",
-        doc_rust_lang_org_channel()
-    );
+    println!("More information available at https://doc.rust-lang.org/rustdoc/what-is-rustdoc.html")
 }
 
 /// A result type used by several functions under `main()`.

src/librustdoc/passes/collect_intra_doc_links.rs

@@ -2017,14 +2017,7 @@ fn disambiguator_error(
     msg: &str,
 ) {
     diag_info.link_range = disambiguator_range;
-    report_diagnostic(cx.tcx, BROKEN_INTRA_DOC_LINKS, msg, &diag_info, |diag, _sp| {
-        let msg = format!(
-            "see https://doc.rust-lang.org/{}/rustdoc/linking-to-items-by-name.html#namespaces-and-disambiguators \
-             for more info about disambiguators",
-            crate::doc_rust_lang_org_channel(),
-        );
-        diag.note(&msg);
-    });
+    report_diagnostic(cx.tcx, BROKEN_INTRA_DOC_LINKS, msg, &diag_info, |_diag, _sp| {});
 }
 
 /// Report an ambiguity error, where there were multiple possible resolutions.

src/test/rustdoc-ui/intra-doc/email-address-localhost.stderr

@@ -10,7 +10,6 @@ note: the lint level is defined here
 LL | #![deny(warnings)]
    |         ^^^^^^^^
    = note: `#[deny(rustdoc::broken_intra_doc_links)]` implied by `#[deny(warnings)]`
-   = note: see https://doc.rust-lang.org/nightly/rustdoc/linking-to-items-by-name.html#namespaces-and-disambiguators for more info about disambiguators
 
 error: aborting due to previous error
 

src/test/rustdoc-ui/intra-doc/unknown-disambiguator.stderr

@@ -10,47 +10,36 @@ note: the lint level is defined here
 LL | #![deny(warnings)]
    |         ^^^^^^^^
    = note: `#[deny(rustdoc::broken_intra_doc_links)]` implied by `#[deny(warnings)]`
-   = note: see https://doc.rust-lang.org/nightly/rustdoc/linking-to-items-by-name.html#namespaces-and-disambiguators for more info about disambiguators
 
 error: unknown disambiguator `bar`
   --> $DIR/unknown-disambiguator.rs:3:35
    |
 LL | //! Linking to [foo@banana] and [`bar@banana!()`].
    |                                   ^^^
-   |
-   = note: see https://doc.rust-lang.org/nightly/rustdoc/linking-to-items-by-name.html#namespaces-and-disambiguators for more info about disambiguators
 
 error: unknown disambiguator `foo`
   --> $DIR/unknown-disambiguator.rs:9:34
    |
 LL | //! And with weird backticks: [``foo@hello``] [foo`@`hello].
    |                                  ^^^
-   |
-   = note: see https://doc.rust-lang.org/nightly/rustdoc/linking-to-items-by-name.html#namespaces-and-disambiguators for more info about disambiguators
 
 error: unknown disambiguator `foo`
   --> $DIR/unknown-disambiguator.rs:9:48
    |
 LL | //! And with weird backticks: [``foo@hello``] [foo`@`hello].
    |                                                ^^^
-   |
-   = note: see https://doc.rust-lang.org/nightly/rustdoc/linking-to-items-by-name.html#namespaces-and-disambiguators for more info about disambiguators
 
 error: unknown disambiguator ``
   --> $DIR/unknown-disambiguator.rs:6:31
    |
 LL | //! And to [no disambiguator](@nectarine) and [another](@apricot!()).
    |                               ^
-   |
-   = note: see https://doc.rust-lang.org/nightly/rustdoc/linking-to-items-by-name.html#namespaces-and-disambiguators for more info about disambiguators
 
 error: unknown disambiguator ``
   --> $DIR/unknown-disambiguator.rs:6:57
    |
 LL | //! And to [no disambiguator](@nectarine) and [another](@apricot!()).
    |                                                         ^
-   |
-   = note: see https://doc.rust-lang.org/nightly/rustdoc/linking-to-items-by-name.html#namespaces-and-disambiguators for more info about disambiguators
 
 error: aborting due to 6 previous errors