Fixing issue https://github.com/rust-lang/cargo/issues/10834:

- Adding display of which target failed to compile
- Consistent messages for warnings/errors.
- Fixing assertions on related tests.

src/cargo/core/compiler/job_queue/mod.rs

@@ -134,6 +134,7 @@ pub use self::job_state::JobState;
 use super::context::OutputFile;
 use super::timings::Timings;
 use super::{BuildContext, BuildPlan, CompileMode, Context, Unit};
+use crate::core::compiler::descriptive_pkg_name;
 use crate::core::compiler::future_incompat::{
     self, FutureBreakageItem, FutureIncompatReportPackage,
 };
@@ -1000,15 +1001,8 @@ impl<'cfg> DrainState<'cfg> {
             None | Some(_) => return,
         };
         let unit = &self.active[&id];
-        let mut message = format!("`{}` ({}", unit.pkg.name(), unit.target.description_named());
-        if unit.mode.is_rustc_test() && !(unit.target.is_test() || unit.target.is_bench()) {
-            message.push_str(" test");
-        } else if unit.mode.is_doc_test() {
-            message.push_str(" doctest");
-        } else if unit.mode.is_doc() {
-            message.push_str(" doc");
-        }
-        message.push_str(") generated ");
+        let mut message = descriptive_pkg_name(&unit.pkg.name(), &unit.target, &unit.mode);
+        message.push_str(" generated ");
         match count.total {
             1 => message.push_str("1 warning"),
             n => drop(write!(message, "{} warnings", n)),

src/cargo/core/compiler/mod.rs

@@ -467,7 +467,8 @@ fn rustc(cx: &mut Context<'_, '_>, unit: &Unit, exec: &Arc<dyn Executor>) -> Car
                         1 => " due to previous error".to_string(),
                         count => format!(" due to {} previous errors", count),
                     };
-                    format!("could not compile `{}`{}{}", name, errors, warnings)
+                    let name = descriptive_pkg_name(&name, &target, &mode);
+                    format!("could not compile {name}{errors}{warnings}")
                 });
 
             if let Err(e) = result {
@@ -1776,3 +1777,19 @@ fn replay_output_cache(
         Ok(())
     })
 }
+
+/// Provides a package name with descriptive target information,
+/// e.g., '`foo` (bin "bar" test)', '`foo` (lib doctest)'.
+fn descriptive_pkg_name(name: &str, target: &Target, mode: &CompileMode) -> String {
+    let desc_name = target.description_named();
+    let mode = if mode.is_rustc_test() && !(target.is_test() || target.is_bench()) {
+        " test"
+    } else if mode.is_doc_test() {
+        " doctest"
+    } else if mode.is_doc() {
+        " doc"
+    } else {
+        ""
+    };
+    format!("`{name}` ({desc_name}{mode})")
+}

tests/testsuite/build.rs

@@ -639,7 +639,9 @@ fn cargo_compile_with_invalid_code() {
 
     p.cargo("build")
         .with_status(101)
-        .with_stderr_contains("[ERROR] could not compile `foo` due to previous error\n")
+        .with_stderr_contains(
+            "[ERROR] could not compile `foo` (bin \"foo\") due to previous error\n",
+        )
         .run();
     assert!(p.root().join("Cargo.lock").is_file());
 }
@@ -5699,7 +5701,7 @@ fn signal_display() {
             "\
 [COMPILING] pm [..]
 [COMPILING] foo [..]
-[ERROR] could not compile `foo`
+[ERROR] could not compile `foo` [..]
 
 Caused by:
   process didn't exit successfully: `rustc [..]` (signal: 6, SIGABRT: process abort signal)

tests/testsuite/build_script.rs

@@ -1678,7 +1678,7 @@ fn build_deps_not_for_normal() {
         .with_stderr_contains("[..]can't find crate for `aaaaa`[..]")
         .with_stderr_contains(
             "\
-[ERROR] could not compile `foo` due to previous error
+[ERROR] could not compile `foo` (lib) due to previous error
 
 Caused by:
   process didn't exit successfully: [..]

tests/testsuite/check.rs

@@ -804,7 +804,7 @@ fn short_message_format() {
         .with_stderr_contains(
             "\
 src/lib.rs:1:27: error[E0308]: mismatched types
-error: could not compile `foo` due to previous error
+error: could not compile `foo` (lib) due to previous error
 ",
         )
         .run();
@@ -1251,7 +1251,7 @@ fn check_fixable_error_no_fix() {
 [CHECKING] foo v0.0.1 ([..])
 {}\
 [WARNING] `foo` (lib) generated 1 warning
-[ERROR] could not compile `foo` due to previous error; 1 warning emitted
+[ERROR] could not compile `foo` (lib) due to previous error; 1 warning emitted
 ",
         rustc_message
     );

tests/testsuite/fix.rs

@@ -29,7 +29,7 @@ fn do_not_fix_broken_builds() {
     p.cargo("fix --allow-no-vcs")
         .env("__CARGO_FIX_YOLO", "1")
         .with_status(101)
-        .with_stderr_contains("[ERROR] could not compile `foo` due to previous error")
+        .with_stderr_contains("[ERROR] could not compile `foo` (lib) due to previous error")
         .run();
     assert!(p.read_file("src/lib.rs").contains("let mut x = 3;"));
 }

tests/testsuite/install.rs

@@ -881,7 +881,7 @@ fn compile_failure() {
         .with_status(101)
         .with_stderr_contains(
             "\
-[ERROR] could not compile `foo` due to previous error
+[ERROR] could not compile `foo` (bin \"foo\") due to previous error
 [ERROR] failed to compile `foo v0.0.1 ([..])`, intermediate artifacts can be \
     found at `[..]target`
 ",

tests/testsuite/messages.rs

@@ -136,7 +136,7 @@ fn deduplicate_errors() {
         .with_stderr(&format!(
             "\
 [COMPILING] foo v0.0.1 [..]
-{}error: could not compile `foo` due to previous error
+{}error: could not compile `foo` (lib) due to previous error
 ",
             rustc_message
         ))