Auto merge of rust-lang#130597 - matthiaskrgr:rollup-9ls4066, r=matthiaskrgr

Rollup of 3 pull requests

Successful merges:

 - rust-lang#130485 (Do not expect infer/bound/placeholder/error in v0 symbol mangling)
 - rust-lang#130567 (Register tool docs for compiletest)
 - rust-lang#130582 (rustdoc: use the correct span for doctests)

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

Author: bors

Diff for: compiler/rustc_symbol_mangling/src/v0.rs

@@ -330,8 +330,12 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
             ty::Float(FloatTy::F128) => "C4f128",
             ty::Never => "z",
 
-            // Placeholders (should be demangled as `_`).
-            ty::Param(_) | ty::Bound(..) | ty::Placeholder(_) | ty::Infer(_) | ty::Error(_) => "p",
+            // Should only be encountered with polymorphization,
+            // or within the identity-substituted impl header of an
+            // item nested within an impl item.
+            ty::Param(_) => "p",
+
+            ty::Bound(..) | ty::Placeholder(_) | ty::Infer(_) | ty::Error(_) => bug!(),
 
             _ => "",
         };
@@ -416,12 +420,18 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
             // Mangle all nominal types as paths.
             ty::Adt(ty::AdtDef(Interned(&ty::AdtDefData { did: def_id, .. }, _)), args)
             | ty::FnDef(def_id, args)
-            | ty::Alias(ty::Projection | ty::Opaque, ty::AliasTy { def_id, args, .. })
             | ty::Closure(def_id, args)
             | ty::CoroutineClosure(def_id, args)
             | ty::Coroutine(def_id, args) => {
                 self.print_def_path(def_id, args)?;
             }
+
+            // We may still encounter projections here due to the printing
+            // logic sometimes passing identity-substituted impl headers.
+            ty::Alias(ty::Projection, ty::AliasTy { def_id, args, .. }) => {
+                self.print_def_path(def_id, args)?;
+            }
+
             ty::Foreign(def_id) => {
                 self.print_def_path(def_id, &[])?;
             }
@@ -467,8 +477,7 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
                 r.print(self)?;
             }
 
-            ty::Alias(ty::Inherent, _) => bug!("symbol_names: unexpected inherent projection"),
-            ty::Alias(ty::Weak, _) => bug!("symbol_names: unexpected weak projection"),
+            ty::Alias(..) => bug!("symbol_names: unexpected alias"),
             ty::CoroutineWitness(..) => bug!("symbol_names: unexpected `CoroutineWitness`"),
         }
 
@@ -550,21 +559,26 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
         let (ct_ty, valtree) = match ct.kind() {
             ty::ConstKind::Value(ty, val) => (ty, val),
 
-            // Placeholders (should be demangled as `_`).
-            // NOTE(eddyb) despite `Unevaluated` having a `DefId` (and therefore
-            // a path), even for it we still need to encode a placeholder, as
-            // the path could refer back to e.g. an `impl` using the constant.
-            ty::ConstKind::Unevaluated(_)
-            | ty::ConstKind::Expr(_)
-            | ty::ConstKind::Param(_)
-            | ty::ConstKind::Infer(_)
-            | ty::ConstKind::Bound(..)
-            | ty::ConstKind::Placeholder(_)
-            | ty::ConstKind::Error(_) => {
+            // Should only be encountered with polymorphization,
+            // or within the identity-substituted impl header of an
+            // item nested within an impl item.
+            ty::ConstKind::Param(_) => {
                 // Never cached (single-character).
                 self.push("p");
                 return Ok(());
             }
+
+            // We may still encounter unevaluated consts due to the printing
+            // logic sometimes passing identity-substituted impl headers.
+            ty::Unevaluated(ty::UnevaluatedConst { def, args, .. }) => {
+                return self.print_def_path(def, args);
+            }
+
+            ty::ConstKind::Expr(_)
+            | ty::ConstKind::Infer(_)
+            | ty::ConstKind::Bound(..)
+            | ty::ConstKind::Placeholder(_)
+            | ty::ConstKind::Error(_) => bug!(),
         };
 
         if let Some(&i) = self.consts.get(&ct) {

Diff for: src/bootstrap/src/core/build_steps/doc.rs

@@ -1058,6 +1058,13 @@ tool_doc!(
     is_library = true,
     crates = ["run_make_support"]
 );
+tool_doc!(
+    Compiletest,
+    "src/tools/compiletest",
+    rustc_tool = false,
+    is_library = true,
+    crates = ["compiletest"]
+);
 
 #[derive(Ord, PartialOrd, Debug, Clone, Hash, PartialEq, Eq)]
 pub struct ErrorIndex {

Diff for: src/bootstrap/src/core/builder.rs

@@ -945,6 +945,7 @@ impl<'a> Builder<'a> {
                 doc::Releases,
                 doc::RunMakeSupport,
                 doc::BuildHelper,
+                doc::Compiletest,
             ),
             Kind::Dist => describe!(
                 dist::Docs,

Diff for: src/librustdoc/doctest/rust.rs

@@ -122,23 +122,14 @@ impl<'a, 'tcx> HirCollector<'a, 'tcx> {
         // anything else, this will combine them for us.
         let attrs = Attributes::from_ast(ast_attrs);
         if let Some(doc) = attrs.opt_doc_value() {
-            // Use the outermost invocation, so that doctest names come from where the docs were written.
-            let span = ast_attrs
-                .iter()
-                .find(|attr| attr.doc_str().is_some())
-                .map(|attr| attr.span.ctxt().outer_expn().expansion_cause().unwrap_or(attr.span))
-                .unwrap_or(DUMMY_SP);
+            let span = span_of_fragments(&attrs.doc_strings).unwrap_or(sp);
             self.collector.position = span;
             markdown::find_testable_code(
                 &doc,
                 &mut self.collector,
                 self.codes,
                 self.enable_per_target_ignores,
-                Some(&crate::html::markdown::ExtraInfo::new(
-                    self.tcx,
-                    def_id,
-                    span_of_fragments(&attrs.doc_strings).unwrap_or(sp),
-                )),
+                Some(&crate::html::markdown::ExtraInfo::new(self.tcx, def_id, span)),
             );
         }
 

Diff for: src/tools/compiletest/src/header.rs

@@ -125,7 +125,7 @@ pub struct TestProps {
     // Build documentation for all specified aux-builds as well
     pub build_aux_docs: bool,
     /// Build the documentation for each crate in a unique output directory.
-    /// Uses <root output directory>/docs/<test name>/doc
+    /// Uses `<root output directory>/docs/<test name>/doc`.
     pub unique_doc_out_dir: bool,
     // Flag to force a crate to be built with the host architecture
     pub force_host: bool,
@@ -1304,12 +1304,12 @@ pub fn llvm_has_libzstd(config: &Config) -> bool {
     false
 }
 
-/// Takes a directive of the form "<version1> [- <version2>]",
-/// returns the numeric representation of <version1> and <version2> as
-/// tuple: (<version1> as u32, <version2> as u32)
+/// Takes a directive of the form `"<version1> [- <version2>]"`,
+/// returns the numeric representation of `<version1>` and `<version2>` as
+/// tuple: `(<version1> as u32, <version2> as u32)`.
 ///
-/// If the <version2> part is omitted, the second component of the tuple
-/// is the same as <version1>.
+/// If the `<version2>` part is omitted, the second component of the tuple
+/// is the same as `<version1>`.
 fn extract_version_range<F>(line: &str, parse: F) -> Option<(u32, u32)>
 where
     F: Fn(&str) -> Option<u32>,

Diff for: tests/rustdoc-ui/doctest/doctest-output-include-fail.md

@@ -0,0 +1,7 @@
+With a code sample, that has an error:
+
+```rust
+fn main() {
+    let x = 234 // no semicolon here! oh no!
+}
+```

Diff for: tests/rustdoc-ui/doctest/doctest-output-include-fail.rs

@@ -0,0 +1,7 @@
+//@ compile-flags:--test --test-args=--test-threads=1
+//@ normalize-stdout-test: "tests/rustdoc-ui/doctest" -> "$$DIR"
+//@ normalize-stdout-test: "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ failure-status: 101
+
+// https://github.com/rust-lang/rust/issues/130470
+#![doc = include_str!("doctest-output-include-fail.md")]

Diff for: tests/rustdoc-ui/doctest/doctest-output-include-fail.stdout

@@ -0,0 +1,24 @@
+
+running 1 test
+test $DIR/doctest-output-include-fail.md - (line 3) ... FAILED
+
+failures:
+
+---- $DIR/doctest-output-include-fail.md - (line 3) stdout ----
+error: expected `;`, found `}`
+  --> $DIR/doctest-output-include-fail.md:5:16
+   |
+LL |     let x = 234 // no semicolon here! oh no!
+   |                ^ help: add `;` here
+LL | }
+   | - unexpected token
+
+error: aborting due to 1 previous error
+
+Couldn't compile the test.
+
+failures:
+    $DIR/doctest-output-include-fail.md - (line 3)
+
+test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+

Diff for: tests/rustdoc-ui/doctest/doctest-output.stdout

@@ -1,7 +1,7 @@
 
 running 3 tests
 test $DIR/doctest-output.rs - (line 8) ... ok
-test $DIR/doctest-output.rs - ExpandedStruct (line 24) ... ok
+test $DIR/doctest-output.rs - ExpandedStruct (line 25) ... ok
 test $DIR/doctest-output.rs - foo::bar (line 18) ... ok
 
 test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME