fix: correct error count for cargo check --message-format json

Author: yichi170

src/cargo/core/compiler/mod.rs

@@ -1867,10 +1867,19 @@ fn on_stderr_line_inner(
 
     #[derive(serde::Deserialize)]
     struct CompilerMessage {
+        message: String,
         level: String,
     }
-    if let Ok(message) = serde_json::from_str::<CompilerMessage>(compiler_message.get()) {
-        count_diagnostic(&message.level, options);
+
+    if let Ok(msg) = serde_json::from_str::<CompilerMessage>(compiler_message.get()) {
+        if msg.message.starts_with("aborting due to")
+            || msg.message.ends_with("warning emitted")
+            || msg.message.ends_with("warnings emitted")
+        {
+            // Skip this line; we'll print our own summary at the end.
+            return Ok(true);
+        }
+        count_diagnostic(&msg.level, options);
     }
 
     let msg = machine_message::FromCompiler {

tests/testsuite/build.rs

@@ -95,7 +95,7 @@ fn cargo_fail_with_no_stderr() {
         .with_status(101)
         .with_stderr_data(str![[r#"
 [COMPILING] foo v0.5.0 ([ROOT]/foo)
-[ERROR] could not compile `foo` (bin "foo") due to 2 previous errors
+[ERROR] could not compile `foo` (bin "foo") due to 1 previous error
 
 "#]])
         .run();

tests/testsuite/pkgid.rs

@@ -327,12 +327,6 @@ fn pkgid_json_message_metadata_consistency() {
     "reason": "compiler-message",
     "...": "{...}"
   },
-  {
-    "manifest_path": "[ROOT]/foo/Cargo.toml",
-    "package_id": "path+[ROOTURL]/foo#0.5.0",
-    "reason": "compiler-message",
-    "...": "{...}"
-  },
   {
     "manifest_path": "[ROOT]/foo/Cargo.toml",
     "package_id": "path+[ROOTURL]/foo#0.5.0",