Rollup merge of #58627 - euclio:rustdoc-pass-order, r=QuietMisdreavus

rustdoc: move collapse and unindent docs passes earlier

Moves these passes as early as possible so later passes will see the same markdown that is passed to the test collector.

Fixes #58473, and a similar issue with the private-doc-tests lint.

r? @QuietMisdreavus

17 files changed, 106 insertions, 152 deletions

diff --git a/src/librustdoc/config.rs b/src/librustdoc/config.rs
index e5caf7fdfa2..b1c53ea92b3 100644
--- a/src/librustdoc/config.rs
+++ b/src/librustdoc/config.rs
@@ -214,7 +214,7 @@ impl Options {
         if matches.opt_strs("passes") == ["list"] {
             println!("Available passes for running rustdoc:");
             for pass in passes::PASSES {
-                println!("{:>20} - {}", pass.name(), pass.description());
+                println!("{:>20} - {}", pass.name, pass.description);
             }
             println!("\nDefault passes for rustdoc:");
             for &name in passes::DEFAULT_PASSES {
diff --git a/src/librustdoc/core.rs b/src/librustdoc/core.rs
index 226924c41c5..4dce4e86cc4 100644
--- a/src/librustdoc/core.rs
+++ b/src/librustdoc/core.rs
@@ -603,10 +603,12 @@ pub fn run_core(options: RustdocOptions) -> (clean::Crate, RenderInfo, RenderOpt
                 passes::defaults(default_passes).iter().map(|p| p.to_string()).collect();
             passes.extend(manual_passes);
 
+            info!("Executing passes");
+
             for pass in &passes {
-                // the "unknown pass" error will be reported when late passes are run
-                if let Some(pass) = passes::find_pass(pass).and_then(|p| p.early_fn()) {
-                    krate = pass(krate, &ctxt);
+                match passes::find_pass(pass).map(|p| p.pass) {
+                    Some(pass) => krate = pass(krate, &ctxt),
+                    None => error!("unknown pass {}, skipping", *pass),
                 }
             }
 
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 5e9f9ee9f80..39e504951d1 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -441,28 +441,6 @@ where R: 'static + Send,
 
         krate.version = crate_version;
 
-        info!("Executing passes");
-
-        for pass in &passes {
-            // determine if we know about this pass
-            let pass = match passes::find_pass(pass) {
-                Some(pass) => if let Some(pass) = pass.late_fn() {
-                    pass
-                } else {
-                    // not a late pass, but still valid so don't report the error
-                    continue
-                }
-                None => {
-                    error!("unknown pass {}, skipping", *pass);
-
-                    continue
-                },
-            };
-
-            // run it
-            krate = pass(krate);
-        }
-
         tx.send(f(Output {
             krate: krate,
             renderinfo: renderinfo,
diff --git a/src/librustdoc/passes/check_code_block_syntax.rs b/src/librustdoc/passes/check_code_block_syntax.rs
index f960374370e..88d9c87c528 100644
--- a/src/librustdoc/passes/check_code_block_syntax.rs
+++ b/src/librustdoc/passes/check_code_block_syntax.rs
@@ -10,9 +10,11 @@ use crate::fold::DocFolder;
 use crate::html::markdown::{self, RustCodeBlock};
 use crate::passes::Pass;
 
-pub const CHECK_CODE_BLOCK_SYNTAX: Pass =
-    Pass::early("check-code-block-syntax", check_code_block_syntax,
-                "validates syntax inside Rust code blocks");
+pub const CHECK_CODE_BLOCK_SYNTAX: Pass = Pass {
+    name: "check-code-block-syntax",
+    pass: check_code_block_syntax,
+    description: "validates syntax inside Rust code blocks",
+};
 
 pub fn check_code_block_syntax(krate: clean::Crate, cx: &DocContext<'_, '_, '_>) -> clean::Crate {
     SyntaxChecker { cx }.fold_crate(krate)
diff --git a/src/librustdoc/passes/collapse_docs.rs b/src/librustdoc/passes/collapse_docs.rs
index e5e60cbe717..088a6ea77c7 100644
--- a/src/librustdoc/passes/collapse_docs.rs
+++ b/src/librustdoc/passes/collapse_docs.rs
@@ -1,13 +1,16 @@
 use crate::clean::{self, DocFragment, Item};
+use crate::core::DocContext;
 use crate::fold;
 use crate::fold::{DocFolder};
 use crate::passes::Pass;
 
 use std::mem::replace;
 
-pub const COLLAPSE_DOCS: Pass =
-    Pass::late("collapse-docs", collapse_docs,
-        "concatenates all document attributes into one document attribute");
+pub const COLLAPSE_DOCS: Pass = Pass {
+    name: "collapse-docs",
+    pass: collapse_docs,
+    description: "concatenates all document attributes into one document attribute",
+};
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 enum DocFragmentKind {
@@ -26,7 +29,7 @@ impl DocFragment {
     }
 }
 
-pub fn collapse_docs(krate: clean::Crate) -> clean::Crate {
+pub fn collapse_docs(krate: clean::Crate, _: &DocContext<'_, '_, '_>) -> clean::Crate {
     Collapser.fold_crate(krate)
 }
 
diff --git a/src/librustdoc/passes/collect_intra_doc_links.rs b/src/librustdoc/passes/collect_intra_doc_links.rs
index 42fa3e2006b..67f291285c4 100644
--- a/src/librustdoc/passes/collect_intra_doc_links.rs
+++ b/src/librustdoc/passes/collect_intra_doc_links.rs
@@ -19,9 +19,11 @@ use crate::passes::{look_for_tests, Pass};
 
 use super::span_of_attrs;
 
-pub const COLLECT_INTRA_DOC_LINKS: Pass =
-    Pass::early("collect-intra-doc-links", collect_intra_doc_links,
-                "reads a crate's documentation to resolve intra-doc-links");
+pub const COLLECT_INTRA_DOC_LINKS: Pass = Pass {
+    name: "collect-intra-doc-links",
+    pass: collect_intra_doc_links,
+    description: "reads a crate's documentation to resolve intra-doc-links",
+};
 
 pub fn collect_intra_doc_links(krate: Crate, cx: &DocContext<'_, '_, '_>) -> Crate {
     if !UnstableFeatures::from_environment().is_nightly_build() {
diff --git a/src/librustdoc/passes/collect_trait_impls.rs b/src/librustdoc/passes/collect_trait_impls.rs
index 903cce3bc03..4c90540871d 100644
--- a/src/librustdoc/passes/collect_trait_impls.rs
+++ b/src/librustdoc/passes/collect_trait_impls.rs
@@ -6,9 +6,11 @@ use super::Pass;
 use rustc::util::nodemap::FxHashSet;
 use rustc::hir::def_id::DefId;
 
-pub const COLLECT_TRAIT_IMPLS: Pass =
-    Pass::early("collect-trait-impls", collect_trait_impls,
-                "retrieves trait impls for items in the crate");
+pub const COLLECT_TRAIT_IMPLS: Pass = Pass {
+    name: "collect-trait-impls",
+    pass: collect_trait_impls,
+    description: "retrieves trait impls for items in the crate",
+};
 
 pub fn collect_trait_impls(krate: Crate, cx: &DocContext<'_, '_, '_>) -> Crate {
     let mut synth = SyntheticImplCollector::new(cx);
diff --git a/src/librustdoc/passes/mod.rs b/src/librustdoc/passes/mod.rs
index 4d7fef7a76a..3a9d8ef20ce 100644
--- a/src/librustdoc/passes/mod.rs
+++ b/src/librustdoc/passes/mod.rs
@@ -6,7 +6,6 @@ use rustc::lint as lint;
 use rustc::middle::privacy::AccessLevels;
 use rustc::util::nodemap::DefIdSet;
 use std::mem;
-use std::fmt;
 use syntax::ast::NodeId;
 use syntax_pos::{DUMMY_SP, Span};
 use std::ops::Range;
@@ -46,84 +45,14 @@ pub use self::collect_trait_impls::COLLECT_TRAIT_IMPLS;
 mod check_code_block_syntax;
 pub use self::check_code_block_syntax::CHECK_CODE_BLOCK_SYNTAX;
 
-/// Represents a single pass.
+/// A single pass over the cleaned documentation.
+///
+/// Runs in the compiler context, so it has access to types and traits and the like.
 #[derive(Copy, Clone)]
-pub enum Pass {
-    /// An "early pass" is run in the compiler context, and can gather information about types and
-    /// traits and the like.
-    EarlyPass {
-        name: &'static str,
-        pass: fn(clean::Crate, &DocContext<'_, '_, '_>) -> clean::Crate,
-        description: &'static str,
-    },
-    /// A "late pass" is run between crate cleaning and page generation.
-    LatePass {
-        name: &'static str,
-        pass: fn(clean::Crate) -> clean::Crate,
-        description: &'static str,
-    },
-}
-
-impl fmt::Debug for Pass {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let mut dbg = match *self {
-            Pass::EarlyPass { .. } => f.debug_struct("EarlyPass"),
-            Pass::LatePass { .. } => f.debug_struct("LatePass"),
-        };
-
-        dbg.field("name", &self.name())
-           .field("pass", &"...")
-           .field("description", &self.description())
-           .finish()
-    }
-}
-
-impl Pass {
-    /// Constructs a new early pass.
-    pub const fn early(name: &'static str,
-                       pass: fn(clean::Crate, &DocContext<'_, '_, '_>) -> clean::Crate,
-                       description: &'static str) -> Pass {
-        Pass::EarlyPass { name, pass, description }
-    }
-
-    /// Constructs a new late pass.
-    pub const fn late(name: &'static str,
-                      pass: fn(clean::Crate) -> clean::Crate,
-                      description: &'static str) -> Pass {
-        Pass::LatePass { name, pass, description }
-    }
-
-    /// Returns the name of this pass.
-    pub fn name(self) -> &'static str {
-        match self {
-            Pass::EarlyPass { name, .. } |
-                Pass::LatePass { name, .. } => name,
-        }
-    }
-
-    /// Returns the description of this pass.
-    pub fn description(self) -> &'static str {
-        match self {
-            Pass::EarlyPass { description, .. } |
-                Pass::LatePass { description, .. } => description,
-        }
-    }
-
-    /// If this pass is an early pass, returns the pointer to its function.
-    pub fn early_fn(self) -> Option<fn(clean::Crate, &DocContext<'_, '_, '_>) -> clean::Crate> {
-        match self {
-            Pass::EarlyPass { pass, .. } => Some(pass),
-            _ => None,
-        }
-    }
-
-    /// If this pass is a late pass, returns the pointer to its function.
-    pub fn late_fn(self) -> Option<fn(clean::Crate) -> clean::Crate> {
-        match self {
-            Pass::LatePass { pass, .. } => Some(pass),
-            _ => None,
-        }
-    }
+pub struct Pass {
+    pub name: &'static str,
+    pub pass: fn(clean::Crate, &DocContext<'_, '_, '_>) -> clean::Crate,
+    pub description: &'static str,
 }
 
 /// The full list of passes.
@@ -141,27 +70,27 @@ pub const PASSES: &'static [Pass] = &[
 ];
 
 /// The list of passes run by default.
-pub const DEFAULT_PASSES: &'static [&'static str] = &[
+pub const DEFAULT_PASSES: &[&str] = &[
     "collect-trait-impls",
+    "collapse-docs",
+    "unindent-comments",
     "check-private-items-doc-tests",
     "strip-hidden",
     "strip-private",
     "collect-intra-doc-links",
     "check-code-block-syntax",
-    "collapse-docs",
-    "unindent-comments",
     "propagate-doc-cfg",
 ];
 
 /// The list of default passes run with `--document-private-items` is passed to rustdoc.
-pub const DEFAULT_PRIVATE_PASSES: &'static [&'static str] = &[
+pub const DEFAULT_PRIVATE_PASSES: &[&str] = &[
     "collect-trait-impls",
+    "collapse-docs",
+    "unindent-comments",
     "check-private-items-doc-tests",
     "strip-priv-imports",
     "collect-intra-doc-links",
     "check-code-block-syntax",
-    "collapse-docs",
-    "unindent-comments",
     "propagate-doc-cfg",
 ];
 
@@ -184,8 +113,8 @@ pub fn defaults(default_set: DefaultPassOption) -> &'static [&'static str] {
 }
 
 /// If the given name matches a known pass, returns its information.
-pub fn find_pass(pass_name: &str) -> Option<Pass> {
-    PASSES.iter().find(|p| p.name() == pass_name).cloned()
+pub fn find_pass(pass_name: &str) -> Option<&'static Pass> {
+    PASSES.iter().find(|p| p.name == pass_name)
 }
 
 struct Stripper<'a> {
@@ -438,11 +367,11 @@ crate fn source_span_for_markdown_range(
         .span_to_snippet(span_of_attrs(attrs))
         .ok()?;
 
-    let starting_line = markdown[..md_range.start].lines().count() - 1;
-    let ending_line = markdown[..md_range.end].lines().count() - 1;
+    let starting_line = markdown[..md_range.start].matches('\n').count();
+    let ending_line = starting_line + markdown[md_range.start..md_range.end].matches('\n').count();
 
-    // We use `split_terminator('\n')` instead of `lines()` when counting bytes so that we only
-    // we can treat CRLF and LF line endings the same way.
+    // We use `split_terminator('\n')` instead of `lines()` when counting bytes so that we treat
+    // CRLF and LF line endings the same way.
     let mut src_lines = snippet.split_terminator('\n');
     let md_lines = markdown.split_terminator('\n');
 
diff --git a/src/librustdoc/passes/private_items_doc_tests.rs b/src/librustdoc/passes/private_items_doc_tests.rs
index 819d15f65e8..1c3977c4f85 100644
--- a/src/librustdoc/passes/private_items_doc_tests.rs
+++ b/src/librustdoc/passes/private_items_doc_tests.rs
@@ -3,10 +3,11 @@ use crate::core::DocContext;
 use crate::fold::DocFolder;
 use crate::passes::{look_for_tests, Pass};
 
-
-pub const CHECK_PRIVATE_ITEMS_DOC_TESTS: Pass =
-    Pass::early("check-private-items-doc-tests", check_private_items_doc_tests,
-                "check private items doc tests");
+pub const CHECK_PRIVATE_ITEMS_DOC_TESTS: Pass = Pass {
+    name: "check-private-items-doc-tests",
+    pass: check_private_items_doc_tests,
+    description: "check private items doc tests",
+};
 
 struct PrivateItemDocTestLinter<'a, 'tcx: 'a, 'rcx: 'a> {
     cx: &'a DocContext<'a, 'tcx, 'rcx>,
diff --git a/src/librustdoc/passes/propagate_doc_cfg.rs b/src/librustdoc/passes/propagate_doc_cfg.rs
index 9ba0b227286..aed80b5ba86 100644
--- a/src/librustdoc/passes/propagate_doc_cfg.rs
+++ b/src/librustdoc/passes/propagate_doc_cfg.rs
@@ -2,14 +2,17 @@ use std::sync::Arc;
 
 use crate::clean::{Crate, Item};
 use crate::clean::cfg::Cfg;
+use crate::core::DocContext;
 use crate::fold::DocFolder;
 use crate::passes::Pass;
 
-pub const PROPAGATE_DOC_CFG: Pass =
-    Pass::late("propagate-doc-cfg", propagate_doc_cfg,
-        "propagates `#[doc(cfg(...))]` to child items");
+pub const PROPAGATE_DOC_CFG: Pass = Pass {
+    name: "propagate-doc-cfg",
+    pass: propagate_doc_cfg,
+    description: "propagates `#[doc(cfg(...))]` to child items",
+};
 
-pub fn propagate_doc_cfg(cr: Crate) -> Crate {
+pub fn propagate_doc_cfg(cr: Crate, _: &DocContext<'_, '_, '_>) -> Crate {
     CfgPropagator { parent_cfg: None }.fold_crate(cr)
 }
 
diff --git a/src/librustdoc/passes/strip_hidden.rs b/src/librustdoc/passes/strip_hidden.rs
index b3d50e06816..330057e5384 100644
--- a/src/librustdoc/passes/strip_hidden.rs
+++ b/src/librustdoc/passes/strip_hidden.rs
@@ -7,9 +7,11 @@ use crate::core::DocContext;
 use crate::fold::{DocFolder, StripItem};
 use crate::passes::{ImplStripper, Pass};
 
-pub const STRIP_HIDDEN: Pass =
-    Pass::early("strip-hidden", strip_hidden,
-                "strips all doc(hidden) items from the output");
+pub const STRIP_HIDDEN: Pass = Pass {
+    name: "strip-hidden",
+    pass: strip_hidden,
+    description: "strips all doc(hidden) items from the output",
+};
 
 /// Strip items marked `#[doc(hidden)]`
 pub fn strip_hidden(krate: clean::Crate, _: &DocContext<'_, '_, '_>) -> clean::Crate {
diff --git a/src/librustdoc/passes/strip_priv_imports.rs b/src/librustdoc/passes/strip_priv_imports.rs
index 3af1403e874..479f0877bd7 100644
--- a/src/librustdoc/passes/strip_priv_imports.rs
+++ b/src/librustdoc/passes/strip_priv_imports.rs
@@ -3,8 +3,11 @@ use crate::fold::{DocFolder};
 use crate::core::DocContext;
 use crate::passes::{ImportStripper, Pass};
 
-pub const STRIP_PRIV_IMPORTS: Pass = Pass::early("strip-priv-imports", strip_priv_imports,
-     "strips all private import statements (`use`, `extern crate`) from a crate");
+pub const STRIP_PRIV_IMPORTS: Pass = Pass {
+    name: "strip-priv-imports",
+    pass: strip_priv_imports,
+    description: "strips all private import statements (`use`, `extern crate`) from a crate",
+};
 
 pub fn strip_priv_imports(krate: clean::Crate, _: &DocContext<'_, '_, '_>)  -> clean::Crate {
     ImportStripper.fold_crate(krate)
diff --git a/src/librustdoc/passes/strip_private.rs b/src/librustdoc/passes/strip_private.rs
index e553d792eb6..1ac3a90f38d 100644
--- a/src/librustdoc/passes/strip_private.rs
+++ b/src/librustdoc/passes/strip_private.rs
@@ -5,10 +5,12 @@ use crate::fold::{DocFolder};
 use crate::core::DocContext;
 use crate::passes::{ImplStripper, ImportStripper, Stripper, Pass};
 
-pub const STRIP_PRIVATE: Pass =
-    Pass::early("strip-private", strip_private,
-        "strips all private items from a crate which cannot be seen externally, \
-         implies strip-priv-imports");
+pub const STRIP_PRIVATE: Pass = Pass {
+    name: "strip-private",
+    pass: strip_private,
+    description: "strips all private items from a crate which cannot be seen externally, \
+        implies strip-priv-imports",
+};
 
 /// Strip private items from the point of view of a crate or externally from a
 /// crate, specified by the `xcrate` flag.
diff --git a/src/librustdoc/passes/unindent_comments.rs b/src/librustdoc/passes/unindent_comments.rs
index 269e4cbe65f..b77cf68d7c6 100644
--- a/src/librustdoc/passes/unindent_comments.rs
+++ b/src/librustdoc/passes/unindent_comments.rs
@@ -3,14 +3,17 @@ use std::string::String;
 use std::usize;
 
 use crate::clean::{self, DocFragment, Item};
+use crate::core::DocContext;
 use crate::fold::{self, DocFolder};
 use crate::passes::Pass;
 
-pub const UNINDENT_COMMENTS: Pass =
-    Pass::late("unindent-comments", unindent_comments,
-        "removes excess indentation on comments in order for markdown to like it");
+pub const UNINDENT_COMMENTS: Pass = Pass {
+    name: "unindent-comments",
+    pass: unindent_comments,
+    description: "removes excess indentation on comments in order for markdown to like it",
+};
 
-pub fn unindent_comments(krate: clean::Crate) -> clean::Crate {
+pub fn unindent_comments(krate: clean::Crate, _: &DocContext<'_, '_, '_>) -> clean::Crate {
     CommentCleaner.fold_crate(krate)
 }
 
diff --git a/src/test/rustdoc-ui/intra-links-warning.stderr b/src/test/rustdoc-ui/intra-links-warning.stderr
index e5409c04205..60fc131dbda 100644
--- a/src/test/rustdoc-ui/intra-links-warning.stderr
+++ b/src/test/rustdoc-ui/intra-links-warning.stderr
@@ -105,8 +105,8 @@ LL | | /// [error]
    |
    = note: the link appears in this line:
            
-            [error]
-             ^^^^^
+           [error]
+            ^^^^^
    = help: to escape `[` and `]` characters, just add '/' before them like `/[` or `/]`
 
 warning: `[error1]` cannot be resolved, ignoring it...
diff --git a/src/test/rustdoc-ui/issue-58473-2.rs b/src/test/rustdoc-ui/issue-58473-2.rs
new file mode 100644
index 00000000000..5e5ddebe108
--- /dev/null
+++ b/src/test/rustdoc-ui/issue-58473-2.rs
@@ -0,0 +1,12 @@
+// compile-pass
+
+#![deny(private_doc_tests)]
+
+mod foo {
+    /**
+    Does nothing, returns `()`
+
+    yadda-yadda-yadda
+    */
+    fn foo() {}
+}
diff --git a/src/test/rustdoc-ui/issue-58473.rs b/src/test/rustdoc-ui/issue-58473.rs
new file mode 100644
index 00000000000..0e5be3292c0
--- /dev/null
+++ b/src/test/rustdoc-ui/issue-58473.rs
@@ -0,0 +1,10 @@
+// compile-pass
+
+pub trait Foo {
+    /**
+    Does nothing, returns `()`
+
+    yadda-yadda-yadda
+    */
+    fn foo() {}
+}