repl: attach location info to syntax errors

Currently, when a file with a syntax error is imported in the
REPL, no information is provided on the error's location. This
commit adds the error's location to the stack trace.

Refs: #2762
Refs: #3411
Refs: #3784
PR-URL: #4013
Reviewed-By: Ben Noordhuis <[email protected]>

lib/repl.js

@@ -274,6 +274,7 @@ function REPLServer(prompt,
   self._domain.on('error', function(e) {
     debug('domain error');
     const top = replMap.get(self);
+    util.decorateErrorStack(e);
     top.outputStream.write((e.stack || e) + '\n');
     top.lineParser.reset();
     top.bufferedCommand = '';

test/parallel/test-repl-syntax-error-stack.js

@@ -0,0 +1,39 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const path = require('path');
+const repl = require('repl');
+const util = require('util');
+let found = false;
+
+process.on('exit', () => {
+  assert.strictEqual(found, true);
+});
+
+// A stream to push an array into a REPL
+function ArrayStream() {
+  this.run = function(data) {
+    data.forEach(line => {
+      this.emit('data', line + '\n');
+    });
+  };
+}
+util.inherits(ArrayStream, require('stream').Stream);
+ArrayStream.prototype.readable = true;
+ArrayStream.prototype.writable = true;
+ArrayStream.prototype.resume = function() {};
+ArrayStream.prototype.write = function(output) {
+  if (/var foo bar;/.test(output))
+    found = true;
+};
+
+const putIn = new ArrayStream();
+const testMe = repl.start('', putIn);
+let file = path.resolve(__dirname, '../fixtures/syntax/bad_syntax');
+
+if (common.isWindows)
+  file = file.replace(/\\/g, '\\\\');
+
+putIn.run(['.clear']);
+putIn.run([`require('${file}');`]);