Auto merge of #135725 - GuillaumeGomez:rollup-dxn3use, r=GuillaumeGomez

Rollup of 5 pull requests

Successful merges:

 - #134858 (Provide structured suggestion for `#![feature(..)]` in more cases)
 - #135679 (create an issue template for bootstrap)
 - #135685 (Remove unused `item-row` CSS class)
 - #135716 (Don't skip argument parsing when running `rustc` with no arguments)
 - #135723 (Fix dev guide docs for error-pattern)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

Diff for: .github/ISSUE_TEMPLATE/bootstrap.md

@@ -0,0 +1,70 @@
+---
+name: Bootstrap (Rust Build System) Report
+about: Issues encountered on bootstrap build system
+labels: C-bug, T-bootstrap
+---
+
+<!--
+Thank you for submitting a bootstrap report! Please provide detailed information to help us reproduce and diagnose the issue.
+-->
+
+### Summary
+
+<!--
+Provide a brief description of the problem you are experiencing.
+-->
+
+### Command used
+
+```sh
+<command>
+```
+
+### Expected behaviour
+
+<!--
+Describe what you expected to happen.
+-->
+
+### Actual behaviour
+
+<!--
+Describe what actually happened.
+-->
+
+### Bootstrap configuration (config.toml)
+```toml
+<config>
+```
+
+### Operating system
+
+<!--
+e.g., Ubuntu 22.04, macOS 12, Windows 10
+-->
+
+### HEAD
+
+<!--
+Output of `git rev-parse HEAD` command, or content of the `git-commit-hash` file if using a tarball source.
+-->
+
+### Additional context
+<!--
+Include any other relevant information (e.g., if you have custom patches or modifications on the project).
+-->
+
+
+<!--
+Include the complete build log in the section below.
+Enable backtrace and verbose mode if possible for more detailed information e.g., with `RUST_BACKTRACE=1 ./x build -v`.
+-->
+<details><summary>Build Log</summary>
+<p>
+
+```txt
+<log>
+```
+
+</p>
+</details>

Diff for: compiler/rustc_const_eval/messages.ftl

@@ -424,7 +424,7 @@ const_eval_unstable_in_stable_exposed =
     .bypass_sugg = otherwise, as a last resort `#[rustc_allow_const_fn_unstable]` can be used to bypass stability checks (this requires team approval)
 
 const_eval_unstable_intrinsic = `{$name}` is not yet stable as a const intrinsic
-    .help = add `#![feature({$feature})]` to the crate attributes to enable
+const_eval_unstable_intrinsic_suggestion = add `#![feature({$feature})]` to the crate attributes to enable
 
 const_eval_unterminated_c_string =
     reading a null-terminated string starting at {$pointer} with no null found before end of allocation

Diff for: compiler/rustc_const_eval/src/check_consts/check.rs

@@ -464,6 +464,12 @@ impl<'mir, 'tcx> Checker<'mir, 'tcx> {
             err_span,
         );
     }
+
+    fn crate_inject_span(&self) -> Option<Span> {
+        self.tcx.hir_crate_items(()).definitions().next().and_then(|id| {
+            self.tcx.crate_level_attribute_injection_span(self.tcx.local_def_id_to_hir_id(id))
+        })
+    }
 }
 
 impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
@@ -809,6 +815,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                                 name: intrinsic.name,
                                 feature,
                                 const_stable_indirect: is_const_stable,
+                                suggestion: self.crate_inject_span(),
                             });
                         }
                         Some(ConstStability { level: StabilityLevel::Stable { .. }, .. }) => {
@@ -897,7 +904,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                                 // regular stability.
                                 feature == sym::rustc_private
                                     && issue == NonZero::new(27812)
-                                    && self.tcx.sess.opts.unstable_opts.force_unstable_if_unmarked
+                                    && tcx.sess.opts.unstable_opts.force_unstable_if_unmarked
                             };
                         // Even if the feature is enabled, we still need check_op to double-check
                         // this if the callee is not safe to expose on stable.
@@ -907,6 +914,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                                 feature,
                                 feature_enabled,
                                 safe_to_expose_on_stable: callee_safe_to_expose_on_stable,
+                                suggestion_span: self.crate_inject_span(),
                             });
                         }
                     }

Diff for: compiler/rustc_const_eval/src/check_consts/ops.rs

@@ -1,8 +1,8 @@
 //! Concrete error types for all operations which may be invalid in a certain const context.
 
 use hir::{ConstContext, LangItem};
-use rustc_errors::Diag;
 use rustc_errors::codes::*;
+use rustc_errors::{Applicability, Diag};
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
 use rustc_infer::infer::TyCtxtInferExt;
@@ -388,6 +388,7 @@ pub(crate) struct FnCallUnstable {
     /// expose on stable.
     pub feature_enabled: bool,
     pub safe_to_expose_on_stable: bool,
+    pub suggestion_span: Option<Span>,
 }
 
 impl<'tcx> NonConstOp<'tcx> for FnCallUnstable {
@@ -407,8 +408,18 @@ impl<'tcx> NonConstOp<'tcx> for FnCallUnstable {
             def_path: ccx.tcx.def_path_str(self.def_id),
         });
         // FIXME: make this translatable
+        let msg = format!("add `#![feature({})]` to the crate attributes to enable", self.feature);
         #[allow(rustc::untranslatable_diagnostic)]
-        err.help(format!("add `#![feature({})]` to the crate attributes to enable", self.feature));
+        if let Some(span) = self.suggestion_span {
+            err.span_suggestion_verbose(
+                span,
+                msg,
+                format!("#![feature({})]\n", self.feature),
+                Applicability::MachineApplicable,
+            );
+        } else {
+            err.help(msg);
+        }
 
         err
     }
@@ -436,6 +447,7 @@ pub(crate) struct IntrinsicUnstable {
     pub name: Symbol,
     pub feature: Symbol,
     pub const_stable_indirect: bool,
+    pub suggestion: Option<Span>,
 }
 
 impl<'tcx> NonConstOp<'tcx> for IntrinsicUnstable {
@@ -455,6 +467,8 @@ impl<'tcx> NonConstOp<'tcx> for IntrinsicUnstable {
             span,
             name: self.name,
             feature: self.feature,
+            suggestion: self.suggestion,
+            help: self.suggestion.is_none(),
         })
     }
 }

Diff for: compiler/rustc_const_eval/src/errors.rs

@@ -123,12 +123,19 @@ pub(crate) struct UnstableConstFn {
 
 #[derive(Diagnostic)]
 #[diag(const_eval_unstable_intrinsic)]
-#[help]
 pub(crate) struct UnstableIntrinsic {
     #[primary_span]
     pub span: Span,
     pub name: Symbol,
     pub feature: Symbol,
+    #[suggestion(
+        const_eval_unstable_intrinsic_suggestion,
+        code = "#![feature({feature})]\n",
+        applicability = "machine-applicable"
+    )]
+    pub suggestion: Option<Span>,
+    #[help(const_eval_unstable_intrinsic_suggestion)]
+    pub help: bool,
 }
 
 #[derive(Diagnostic)]

Diff for: compiler/rustc_driver_impl/src/lib.rs

@@ -1191,15 +1191,6 @@ fn print_flag_list<T>(cmdline_opt: &str, flag_list: &[OptionDesc<T>]) {
 /// be public when using rustc as a library, see
 /// <https://github.com/rust-lang/rust/commit/2b4c33817a5aaecabf4c6598d41e190080ec119e>
 pub fn handle_options(early_dcx: &EarlyDiagCtxt, args: &[String]) -> Option<getopts::Matches> {
-    if args.is_empty() {
-        // user did not write `-v` nor `-Z unstable-options`, so do not
-        // include that extra information.
-        let nightly_build =
-            rustc_feature::UnstableFeatures::from_environment(None).is_nightly_build();
-        usage(false, false, nightly_build);
-        return None;
-    }
-
     // Parse with *all* options defined in the compiler, we don't worry about
     // option stability here we just want to parse as much as possible.
     let mut options = getopts::Options::new();
@@ -1245,7 +1236,7 @@ pub fn handle_options(early_dcx: &EarlyDiagCtxt, args: &[String]) -> Option<geto
     //   (unstable option being used on stable)
     nightly_options::check_nightly_options(early_dcx, &matches, &config::rustc_optgroups());
 
-    if matches.opt_present("h") || matches.opt_present("help") {
+    if args.is_empty() || matches.opt_present("h") || matches.opt_present("help") {
         // Only show unstable options in --help if we accept unstable options.
         let unstable_enabled = nightly_options::is_unstable_enabled(&matches);
         let nightly_build = nightly_options::match_is_nightly_build(&matches);

Diff for: compiler/rustc_hir_typeck/src/errors.rs

@@ -19,8 +19,15 @@ use crate::fluent_generated as fluent;
 pub(crate) struct BaseExpressionDoubleDot {
     #[primary_span]
     pub span: Span,
+    #[suggestion(
+        hir_typeck_base_expression_double_dot_enable_default_field_values,
+        code = "#![feature(default_field_values)]\n",
+        applicability = "machine-applicable",
+        style = "verbose"
+    )]
+    pub default_field_values_suggestion: Option<Span>,
     #[subdiagnostic]
-    pub default_field_values: Option<BaseExpressionDoubleDotEnableDefaultFieldValues>,
+    pub default_field_values_help: Option<BaseExpressionDoubleDotEnableDefaultFieldValues>,
     #[subdiagnostic]
     pub add_expr: Option<BaseExpressionDoubleDotAddExpr>,
     #[subdiagnostic]

Diff for: compiler/rustc_hir_typeck/src/expr.rs

@@ -2138,13 +2138,24 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 }
             }
             if !self.tcx.features().default_field_values() {
+                let sugg = self.tcx.crate_level_attribute_injection_span(expr.hir_id);
                 self.dcx().emit_err(BaseExpressionDoubleDot {
                     span: span.shrink_to_hi(),
                     // We only mention enabling the feature if this is a nightly rustc *and* the
                     // expression would make sense with the feature enabled.
-                    default_field_values: if self.tcx.sess.is_nightly_build()
+                    default_field_values_suggestion: if self.tcx.sess.is_nightly_build()
                         && missing_mandatory_fields.is_empty()
                         && !missing_optional_fields.is_empty()
+                        && sugg.is_some()
+                    {
+                        sugg
+                    } else {
+                        None
+                    },
+                    default_field_values_help: if self.tcx.sess.is_nightly_build()
+                        && missing_mandatory_fields.is_empty()
+                        && !missing_optional_fields.is_empty()
+                        && sugg.is_none()
                     {
                         Some(BaseExpressionDoubleDotEnableDefaultFieldValues)
                     } else {

Diff for: src/doc/rustc-dev-guide/src/tests/directives.md

@@ -94,7 +94,8 @@ for more details.
 | Directive                         | Explanation                                                                                                              | Supported test suites                        | Possible values                                                                         |
 |-----------------------------------|--------------------------------------------------------------------------------------------------------------------------|----------------------------------------------|-----------------------------------------------------------------------------------------|
 | `check-run-results`               | Check run test binary `run-{pass,fail}` output snapshot                                                                  | `ui`, `crashes`, `incremental` if `run-pass` | N/A                                                                                     |
-| `error-pattern`                   | Check that output contains a regex pattern                                                                               | `ui`, `crashes`, `incremental` if `run-pass` | Regex                                                                                   |
+| `error-pattern`                   | Check that output contains a specific string                                                                             | `ui`, `crashes`, `incremental` if `run-pass` | String                                                                                   |
+| `regex-error-pattern`             | Check that output contains a regex pattern                                                                               | `ui`, `crashes`, `incremental` if `run-pass` | Regex                                                                                   |
 | `check-stdout`                    | Check `stdout` against `error-pattern`s from running test binary[^check_stdout]                                          | `ui`, `crashes`, `incremental`               | N/A                                                                                     |
 | `normalize-stderr-32bit`          | Normalize actual stderr (for 32-bit platforms) with a rule `"<raw>" -> "<normalized>"` before comparing against snapshot | `ui`, `incremental`                          | `"<RAW>" -> "<NORMALIZED>"`, `<RAW>`/`<NORMALIZED>` is regex capture and replace syntax |
 | `normalize-stderr-64bit`          | Normalize actual stderr (for 64-bit platforms) with a rule `"<raw>" -> "<normalized>"` before comparing against snapshot | `ui`, `incremental`                          | `"<RAW>" -> "<NORMALIZED>"`, `<RAW>`/`<NORMALIZED>` is regex capture and replace syntax |

Diff for: src/librustdoc/html/static/css/rustdoc.css

@@ -2473,7 +2473,7 @@ in src-script.js and main.js
 	}
 
 	/* Display an alternating layout on tablets and phones */
-	.item-row, .search-results > a, .search-results > a > div {
+	.search-results > a, .search-results > a > div {
 		display: block;
 	}
 

Diff for: tests/rustdoc/multiple-mods-w-same-name-doc-inline-83375.rs

@@ -10,7 +10,7 @@ pub mod sub {
 }
 
 //@ count foo/index.html '//a[@class="mod"][@title="mod foo::prelude"]' 1
-//@ count foo/prelude/index.html '//div[@class="item-row"]' 0
+//@ count foo/prelude/index.html '//ul[@class="item-table"]' 0
 pub mod prelude {}
 
 #[doc(inline)]

Diff for: tests/rustdoc/multiple-mods-w-same-name-doc-inline-last-item-83375.rs

@@ -13,5 +13,5 @@ pub mod sub {
 pub use sub::*;
 
 //@ count foo/index.html '//a[@class="mod"][@title="mod foo::prelude"]' 1
-//@ count foo/prelude/index.html '//div[@class="item-row"]' 0
+//@ count foo/prelude/index.html '//ul[@class="item-table"]' 0
 pub mod prelude {}

Diff for: tests/ui/consts/const-unstable-intrinsic.stderr

@@ -24,15 +24,21 @@ error: `size_of_val` is not yet stable as a const intrinsic
 LL |         unstable_intrinsic::size_of_val(&x);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: add `#![feature(unstable)]` to the crate attributes to enable
+help: add `#![feature(unstable)]` to the crate attributes to enable
+   |
+LL + #![feature(unstable)]
+   |
 
 error: `min_align_of_val` is not yet stable as a const intrinsic
   --> $DIR/const-unstable-intrinsic.rs:20:9
    |
 LL |         unstable_intrinsic::min_align_of_val(&x);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = help: add `#![feature(unstable)]` to the crate attributes to enable
+help: add `#![feature(unstable)]` to the crate attributes to enable
+   |
+LL + #![feature(unstable)]
+   |
 
 error: const function that might be (indirectly) exposed to stable cannot use `#[feature(local)]`
   --> $DIR/const-unstable-intrinsic.rs:24:9