Auto merge of #44274 - Mark-Simulacrum:rustdoc-tests, r=alexcrichton

Test rustdoc.

Also fixes the broken tests.

r? @alexcrichton

src/bootstrap/builder.rs

@@ -251,9 +251,9 @@ impl<'a> Builder<'a> {
                 tool::RustInstaller, tool::Cargo, tool::Rls, tool::Rustdoc, tool::Clippy,
                 native::Llvm),
             Kind::Test => describe!(check::Tidy, check::Bootstrap, check::DefaultCompiletest,
-                check::HostCompiletest, check::Crate, check::CrateLibrustc, check::Linkcheck,
+                check::HostCompiletest, check::Crate, check::CrateLibrustc, check::Rustdoc,
-                check::Cargotest, check::Cargo, check::Rls, check::Docs, check::ErrorIndex,
+                check::Linkcheck, check::Cargotest, check::Cargo, check::Rls, check::Docs,
-                check::Distcheck),
+                check::ErrorIndex, check::Distcheck),
             Kind::Bench => describe!(check::Crate, check::CrateLibrustc),
             Kind::Doc => describe!(doc::UnstableBook, doc::UnstableBookGen, doc::TheBook,
                 doc::Standalone, doc::Std, doc::Test, doc::Rustc, doc::ErrorIndex, doc::Nomicon,

src/bootstrap/check.rs

@@ -900,7 +900,6 @@ impl Step for CrateLibrustc {
     }
 }
 
-
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
 pub struct Crate {
     compiler: Compiler,
@@ -1080,6 +1079,74 @@ impl Step for Crate {
     }
 }
 
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub struct Rustdoc {
+    host: Interned<String>,
+    test_kind: TestKind,
+}
+
+impl Step for Rustdoc {
+    type Output = ();
+    const DEFAULT: bool = true;
+    const ONLY_HOSTS: bool = true;
+
+    fn should_run(run: ShouldRun) -> ShouldRun {
+        run.path("src/librustdoc").path("src/tools/rustdoc")
+    }
+
+    fn make_run(run: RunConfig) {
+        let builder = run.builder;
+
+        let test_kind = if builder.kind == Kind::Test {
+            TestKind::Test
+        } else if builder.kind == Kind::Bench {
+            TestKind::Bench
+        } else {
+            panic!("unexpected builder.kind in crate: {:?}", builder.kind);
+        };
+
+        builder.ensure(Rustdoc {
+            host: run.host,
+            test_kind,
+        });
+    }
+
+    fn run(self, builder: &Builder) {
+        let build = builder.build;
+        let test_kind = self.test_kind;
+
+        let compiler = builder.compiler(builder.top_stage, self.host);
+        let target = compiler.host;
+
+        builder.ensure(RemoteCopyLibs { compiler, target });
+
+        let mut cargo = builder.cargo(compiler, Mode::Librustc, target, test_kind.subcommand());
+        compile::rustc_cargo(build, &compiler, target, &mut cargo);
+        let _folder = build.fold_output(|| {
+            format!("{}_stage{}-rustdoc", test_kind.subcommand(), compiler.stage)
+        });
+        println!("{} rustdoc stage{} ({} -> {})", test_kind, compiler.stage,
+                &compiler.host, target);
+
+        if test_kind.subcommand() == "test" && !build.fail_fast {
+            cargo.arg("--no-fail-fast");
+        }
+
+        cargo.arg("-p").arg("rustdoc:0.0.0");
+
+        cargo.arg("--");
+        cargo.args(&build.config.cmd.test_args());
+
+        if build.config.quiet_tests {
+            cargo.arg("--quiet");
+        }
+
+        let _time = util::timeit();
+
+        try_run(build, &mut cargo);
+    }
+}
+
 fn envify(s: &str) -> String {
     s.chars().map(|c| {
         match c {

src/librustdoc/Cargo.toml

@@ -7,6 +7,8 @@ build = "build.rs"
 [lib]
 name = "rustdoc"
 path = "lib.rs"
+# SNAP/stage0(cargo)
+doctest = false
 
 [dependencies]
 env_logger = { version = "0.4", default-features = false }

src/librustdoc/clean/simplify.rs

@@ -15,13 +15,8 @@
 //! the AST (e.g. see all of `clean::inline`), but this is not always a
 //! non-lossy transformation. The current format of storage for where clauses
 //! for functions and such is simply a list of predicates. One example of this
-//! is that the AST predicate of:
+//! is that the AST predicate of: `where T: Trait<Foo=Bar>` is encoded as:
-//!
+//! `where T: Trait, <T as Trait>::Foo = Bar`.
-//!     where T: Trait<Foo=Bar>
-//!
-//! is encoded as:
-//!
-//!     where T: Trait, <T as Trait>::Foo = Bar
 //!
 //! This module attempts to reconstruct the original where and/or parameter
 //! bounds by special casing scenarios such as these. Fun!

src/librustdoc/html/markdown.rs

@@ -16,10 +16,12 @@
 //! of `fmt::Display`. Example usage:
 //!
 //! ```
-//! use rustdoc::html::markdown::Markdown;
+//! #![feature(rustc_private)]
+//!
+//! use rustdoc::html::markdown::{RenderType, Markdown};
 //!
 //! let s = "My *markdown* _text_";
-//! let html = format!("{}", Markdown(s));
+//! let html = format!("{}", Markdown(s, RenderType::Pulldown));
 //! // ... something using html
 //! ```