Auto merge of #75903 - jyn514:lint-refactor, r=GuillaumeGomez

Warn about unknown or renamed lints in rustdoc

Fixes https://github.com/rust-lang/rust/issues/75884.
This is best reviewed one commit at a time.
r? @GuillaumeGomez

Originally I tried to do a much broader refactoring that got rid of `init_lints` altogether. My reasoning is that now the lints aren't being run anymore (after https://github.com/rust-lang/rust/pull/73566), there's no need to ignore them explicitly. But it seems there are still some lints that aren't affected by setting `lint_mod` to a no-op:

```
deny(pub_use_of_private_extern_crate)
deny(const_err)
warn(unused_imports)
```

(there are possibly more, these are just the ones that failed in the rustdoc test suite).

Some of these seem like we really should be warning about, but that's a much larger change and I don't propose to make it here. So for the time being, this just adds the `unknown_lints` and `renamed_or_removed_lints` passes to the list of lints rustdoc warns about.

6 files changed, 58 insertions, 18 deletions

diff --git a/src/librustdoc/config.rs b/src/librustdoc/config.rs
index 4f751decc80..14df4e7aa8e 100644
--- a/src/librustdoc/config.rs
+++ b/src/librustdoc/config.rs
@@ -83,9 +83,9 @@ pub struct Options {
     /// Codegen options strings to hand to the compiler.
     pub codegen_options_strs: Vec<String>,
     /// Debugging (`-Z`) options to pass to the compiler.
-    pub debugging_options: DebuggingOptions,
+    pub debugging_opts: DebuggingOptions,
     /// Debugging (`-Z`) options strings to pass to the compiler.
-    pub debugging_options_strs: Vec<String>,
+    pub debugging_opts_strs: Vec<String>,
     /// The target used to compile the crate against.
     pub target: TargetTriple,
     /// Edition used when reading the crate. Defaults to "2015". Also used by default when
@@ -318,9 +318,9 @@ impl Options {
         let error_format = config::parse_error_format(&matches, color, json_rendered);
 
         let codegen_options = build_codegen_options(matches, error_format);
-        let debugging_options = build_debugging_options(matches, error_format);
+        let debugging_opts = build_debugging_options(matches, error_format);
 
-        let diag = new_handler(error_format, None, &debugging_options);
+        let diag = new_handler(error_format, None, &debugging_opts);
 
         // check for deprecated options
         check_deprecated_options(&matches, &diag);
@@ -365,7 +365,7 @@ impl Options {
             .iter()
             .map(|s| SearchPath::from_cli_opt(s, error_format))
             .collect();
-        let externs = parse_externs(&matches, &debugging_options, error_format);
+        let externs = parse_externs(&matches, &debugging_opts, error_format);
         let extern_html_root_urls = match parse_extern_html_roots(&matches) {
             Ok(ex) => ex,
             Err(err) => {
@@ -546,7 +546,7 @@ impl Options {
         let persist_doctests = matches.opt_str("persist-doctests").map(PathBuf::from);
         let test_builder = matches.opt_str("test-builder").map(PathBuf::from);
         let codegen_options_strs = matches.opt_strs("C");
-        let debugging_options_strs = matches.opt_strs("Z");
+        let debugging_opts_strs = matches.opt_strs("Z");
         let lib_strs = matches.opt_strs("L");
         let extern_strs = matches.opt_strs("extern");
         let runtool = matches.opt_str("runtool");
@@ -569,8 +569,8 @@ impl Options {
             cfgs,
             codegen_options,
             codegen_options_strs,
-            debugging_options,
-            debugging_options_strs,
+            debugging_opts,
+            debugging_opts_strs,
             target,
             edition,
             maybe_sysroot,
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
index 7a0cf3717c9..89b217dc7d4 100644
--- a/src/librustdoc/core.rs
+++ b/src/librustdoc/core.rs
@@ -234,7 +234,7 @@ pub fn new_handler(
 /// It returns a tuple containing:
 ///  * Vector of tuples of lints' name and their associated "max" level
 ///  * HashMap of lint id with their associated "max" level
-pub fn init_lints<F>(
+pub(crate) fn init_lints<F>(
     mut allowed_lints: Vec<String>,
     lint_opts: Vec<(String, lint::Level)>,
     filter_call: F,
@@ -257,7 +257,7 @@ where
         .filter_map(|lint| {
             // Permit feature-gated lints to avoid feature errors when trying to
             // allow all lints.
-            if lint.name == warnings_lint_name || lint.feature_gate.is_some() {
+            if lint.feature_gate.is_some() || allowed_lints.iter().any(|l| lint.name == l) {
                 None
             } else {
                 filter_call(lint)
@@ -294,7 +294,7 @@ pub fn run_core(
         externs,
         mut cfgs,
         codegen_options,
-        debugging_options,
+        debugging_opts,
         target,
         edition,
         maybe_sysroot,
@@ -328,19 +328,23 @@ pub fn run_core(
     let private_doc_tests = rustc_lint::builtin::PRIVATE_DOC_TESTS.name;
     let no_crate_level_docs = rustc_lint::builtin::MISSING_CRATE_LEVEL_DOCS.name;
     let invalid_codeblock_attributes_name = rustc_lint::builtin::INVALID_CODEBLOCK_ATTRIBUTES.name;
+    let renamed_and_removed_lints = rustc_lint::builtin::RENAMED_AND_REMOVED_LINTS.name;
+    let unknown_lints = rustc_lint::builtin::UNKNOWN_LINTS.name;
 
     // In addition to those specific lints, we also need to allow those given through
     // command line, otherwise they'll get ignored and we don't want that.
-    let allowed_lints = vec![
+    let lints_to_show = vec![
         intra_link_resolution_failure_name.to_owned(),
         missing_docs.to_owned(),
         missing_doc_example.to_owned(),
         private_doc_tests.to_owned(),
         no_crate_level_docs.to_owned(),
         invalid_codeblock_attributes_name.to_owned(),
+        renamed_and_removed_lints.to_owned(),
+        unknown_lints.to_owned(),
     ];
 
-    let (lint_opts, lint_caps) = init_lints(allowed_lints, lint_opts, |lint| {
+    let (lint_opts, lint_caps) = init_lints(lints_to_show, lint_opts, |lint| {
         if lint.name == intra_link_resolution_failure_name
             || lint.name == invalid_codeblock_attributes_name
         {
@@ -358,13 +362,13 @@ pub fn run_core(
         search_paths: libs,
         crate_types,
         lint_opts: if !display_warnings { lint_opts } else { vec![] },
-        lint_cap: Some(lint_cap.unwrap_or_else(|| lint::Forbid)),
+        lint_cap,
         cg: codegen_options,
         externs,
         target_triple: target,
         unstable_features: UnstableFeatures::from_environment(),
         actually_rustdoc: true,
-        debugging_opts: debugging_options,
+        debugging_opts,
         error_format,
         edition,
         describe_lints,
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 6d79924a06b..b5e246b5d17 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -472,7 +472,7 @@ fn run_renderer<T: formats::FormatRenderer>(
 }
 
 fn main_options(options: config::Options) -> MainResult {
-    let diag = core::new_handler(options.error_format, None, &options.debugging_options);
+    let diag = core::new_handler(options.error_format, None, &options.debugging_opts);
 
     match (options.should_test, options.markdown_input()) {
         (true, true) => return wrap_return(&diag, markdown::test(options)),
@@ -488,7 +488,7 @@ fn main_options(options: config::Options) -> MainResult {
 
     // need to move these items separately because we lose them by the time the closure is called,
     // but we can't crates the Handler ahead of time because it's not Send
-    let diag_opts = (options.error_format, options.edition, options.debugging_options.clone());
+    let diag_opts = (options.error_format, options.edition, options.debugging_opts.clone());
     let show_coverage = options.show_coverage;
 
     // First, parse the crate and extract all relevant information.
diff --git a/src/librustdoc/test.rs b/src/librustdoc/test.rs
index 693d5b9fb07..7b7c152d8ab 100644
--- a/src/librustdoc/test.rs
+++ b/src/librustdoc/test.rs
@@ -281,7 +281,7 @@ fn run_test(
     for codegen_options_str in &options.codegen_options_strs {
         compiler.arg("-C").arg(&codegen_options_str);
     }
-    for debugging_option_str in &options.debugging_options_strs {
+    for debugging_option_str in &options.debugging_opts_strs {
         compiler.arg("-Z").arg(&debugging_option_str);
     }
     if no_run && !compile_fail {
diff --git a/src/test/rustdoc-ui/unknown-renamed-lints.rs b/src/test/rustdoc-ui/unknown-renamed-lints.rs
new file mode 100644
index 00000000000..7faa82ea429
--- /dev/null
+++ b/src/test/rustdoc-ui/unknown-renamed-lints.rs
@@ -0,0 +1,8 @@
+#![deny(unknown_lints)]
+//~^ NOTE lint level is defined
+#![deny(renamed_and_removed_lints)]
+//~^ NOTE lint level is defined
+#![deny(x)]
+//~^ ERROR unknown lint
+#![deny(intra_doc_link_resolution_failure)]
+//~^ ERROR lint `intra_doc_link_resolution_failure` has been renamed
diff --git a/src/test/rustdoc-ui/unknown-renamed-lints.stderr b/src/test/rustdoc-ui/unknown-renamed-lints.stderr
new file mode 100644
index 00000000000..f0917f194bb
--- /dev/null
+++ b/src/test/rustdoc-ui/unknown-renamed-lints.stderr
@@ -0,0 +1,28 @@
+error: unknown lint: `x`
+  --> $DIR/unknown-renamed-lints.rs:5:9
+   |
+LL | #![deny(x)]
+   |         ^
+   |
+note: the lint level is defined here
+  --> $DIR/unknown-renamed-lints.rs:1:9
+   |
+LL | #![deny(unknown_lints)]
+   |         ^^^^^^^^^^^^^
+
+error: lint `intra_doc_link_resolution_failure` has been renamed to `broken_intra_doc_links`
+  --> $DIR/unknown-renamed-lints.rs:7:9
+   |
+LL | #![deny(intra_doc_link_resolution_failure)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `broken_intra_doc_links`
+   |
+note: the lint level is defined here
+  --> $DIR/unknown-renamed-lints.rs:3:9
+   |
+LL | #![deny(renamed_and_removed_lints)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: Compilation failed, aborting rustdoc
+
+error: aborting due to 3 previous errors
+