Rollup merge of #120132 - oli-obk:helpful_tidy, r=Mark-Simulacrum

Teach tidy about line/col information for malformed features

This makes it significantly easier to find the specific feature, since you can now just click it in the command line of your IDE

Author: matthiaskrgr

src/tools/tidy/src/features.rs

@@ -15,7 +15,7 @@ use std::ffi::OsStr;
 use std::fmt;
 use std::fs;
 use std::num::NonZeroU32;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 use regex::Regex;
 
@@ -52,6 +52,8 @@ pub struct Feature {
     pub since: Option<Version>,
     pub has_gate_test: bool,
     pub tracking_issue: Option<NonZeroU32>,
+    pub file: PathBuf,
+    pub line: usize,
 }
 impl Feature {
     fn tracking_issue_display(&self) -> impl fmt::Display {
@@ -184,23 +186,25 @@ pub fn check(
         .chain(lib_features.iter().map(|feat| (feat, "lib")));
     for ((feature_name, feature), kind) in all_features_iter {
         let since = if let Some(since) = feature.since { since } else { continue };
+        let file = feature.file.display();
+        let line = feature.line;
         if since > version && since != Version::CurrentPlaceholder {
             tidy_error!(
                 bad,
-                "The stabilization version {since} of {kind} feature `{feature_name}` is newer than the current {version}"
+                "{file}:{line}: The stabilization version {since} of {kind} feature `{feature_name}` is newer than the current {version}"
             );
         }
         if channel == "nightly" && since == version {
             tidy_error!(
                 bad,
-                "The stabilization version {since} of {kind} feature `{feature_name}` is written out but should be {}",
+                "{file}:{line}: The stabilization version {since} of {kind} feature `{feature_name}` is written out but should be {}",
                 version::VERSION_PLACEHOLDER
             );
         }
         if channel != "nightly" && since == Version::CurrentPlaceholder {
             tidy_error!(
                 bad,
-                "The placeholder use of {kind} feature `{feature_name}` is not allowed on the {channel} channel",
+                "{file}:{line}: The placeholder use of {kind} feature `{feature_name}` is not allowed on the {channel} channel",
             );
         }
     }
@@ -433,7 +437,14 @@ fn collect_lang_features_in(features: &mut Features, base: &Path, file: &str, ba
                 );
             }
             Entry::Vacant(e) => {
-                e.insert(Feature { level, since, has_gate_test: false, tracking_issue });
+                e.insert(Feature {
+                    level,
+                    since,
+                    has_gate_test: false,
+                    tracking_issue,
+                    file: path.to_path_buf(),
+                    line: line_number,
+                });
             }
         }
     }
@@ -559,6 +570,8 @@ fn map_lib_features(
                         since: None,
                         has_gate_test: false,
                         tracking_issue: find_attr_val(line, "issue").and_then(handle_issue_none),
+                        file: file.to_path_buf(),
+                        line: i + 1,
                     };
                     mf(Ok((feature_name, feature)), file, i + 1);
                     continue;
@@ -588,7 +601,14 @@ fn map_lib_features(
                 };
                 let tracking_issue = find_attr_val(line, "issue").and_then(handle_issue_none);
 
-                let feature = Feature { level, since, has_gate_test: false, tracking_issue };
+                let feature = Feature {
+                    level,
+                    since,
+                    has_gate_test: false,
+                    tracking_issue,
+                    file: file.to_path_buf(),
+                    line: i + 1,
+                };
                 if line.contains(']') {
                     mf(Ok((feature_name, feature)), file, i + 1);
                 } else {