From 9d52541b67b9bad6e77c5b62e9a2cb4212d4998a Mon Sep 17 00:00:00 2001
From: "Nicholas C. Zakas" <nicholas@nczconsulting.com>
Date: Thu, 20 Sep 2018 07:04:51 -0700
Subject: [PATCH] Fix: Remove duplicate error message on crash (fixes #8964)
 (#10865)

---
 bin/eslint.js       |  1 -
 tests/bin/eslint.js | 18 +++++++++++++++++-
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/bin/eslint.js b/bin/eslint.js
index adc07c2e75c..e51121ec6af 100755
--- a/bin/eslint.js
+++ b/bin/eslint.js
@@ -48,7 +48,6 @@ process.once("uncaughtException", err => {
         console.error(`\nESLint: ${pkg.version}.\n${template(err.messageData || {})}`);
     } else {
 
-        console.error(err.message);
         console.error(err.stack);
     }
 
diff --git a/tests/bin/eslint.js b/tests/bin/eslint.js
index 75e7c2c4b7c..7749b12f107 100644
--- a/tests/bin/eslint.js
+++ b/tests/bin/eslint.js
@@ -333,12 +333,28 @@ describe("bin/eslint.js", () => {
             return Promise.all([exitCodeAssertion, outputAssertion]);
         });
 
+        it("prints the error message exactly once to stderr in the event of a crash", () => {
+            const child = runESLint(["--rule=no-restricted-syntax:[error, 'Invalid Selector [[[']", "Makefile.js"]);
+            const exitCodeAssertion = assertExitCode(child, 2);
+            const outputAssertion = getOutput(child).then(output => {
+                const expectedSubstring = "Syntax error in selector";
+
+                assert.strictEqual(output.stdout, "");
+                assert.include(output.stderr, expectedSubstring);
+
+                // The message should appear exactly once in stderr
+                assert.strictEqual(output.stderr.indexOf(expectedSubstring), output.stderr.lastIndexOf(expectedSubstring));
+            });
+
+            return Promise.all([exitCodeAssertion, outputAssertion]);
+        });
+
         it("prints the error message pointing to line of code", () => {
             const invalidConfig = `${__dirname}/../fixtures/bin/.eslintrc.yml`;
             const child = runESLint(["--no-ignore", invalidConfig]);
             const exitCodeAssertion = assertExitCode(child, 2);
             const outputAssertion = getOutput(child).then(output => {
-                const expectedSubstring = "Error: bad indentation of a mapping entry at line";
+                const expectedSubstring = ": bad indentation of a mapping entry at line";
 
                 assert.strictEqual(output.stdout, "");
                 assert.include(output.stderr, expectedSubstring);