Collate stacks in test output

pkg/compiler/tool/status_files/log_parser.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library status_files.log_parser;
 
 import 'record.dart';
 
+final RegExp _stackRE = new RegExp('#[0-9]* ');
+
 /// Extracts test records from a test.py [log].
 List<Record> parse(String log) {
   var records = [];
   var suite;
   var test;
   var config;
   var expected;
   var actual;
   var reason;
+  var fullReason; // lines before stack, usually multiline reason.
+  var stack = [];
+  var paragraph = []; // collector forlines

[Siggi Cherem (dart-lang), 2017/08/09 18:08:02]

forlines? for fullReason?

[sra1, 2017/08/09 20:15:13]

Done.

   bool reproIsNext = false;
   for (var line in log.split('\n')) {
     if (line.startsWith("FAILED: ")) {
       int space = line.lastIndexOf(' ');
       test = line.substring(space + 1).trim();
       suite = '';
       var slash = test.indexOf('/');
       if (slash > 0) {
         suite = test.substring(0, slash).trim();
         test = test.substring(slash + 1).trim();
       }
       config = line
           .substring("FAILED: ".length, space)
           .replaceAll('release_ia32', '')
           .replaceAll('release_x64', '');
     }
     if (line.startsWith("Expected: ")) {
       expected = line.substring("Expected: ".length).trim();
     }
     if (line.startsWith("Actual: ")) {
       actual = line.substring("Actual: ".length).trim();
     }
     if (line.startsWith("The compiler crashed:")) {
       reason = line.substring("The compiler crashed:".length).trim();
+      paragraph.clear();
     }
+
+    if (line.startsWith(_stackRE)) {
+      stack.add(line);
+      fullReason ??= paragraph.take(5).join('\n');
+      paragraph.clear();
+    } else {
+      paragraph.add(line);
+    }
+
     if (reproIsNext) {
-      records.add(new Record(
-          suite, test, config, expected, actual, reason, line.trim()));
+      records.add(new Record(suite, test, config, expected, actual, reason,
+          line.trim(), fullReason, stack));
       suite = test = config = expected = actual = reason = null;
+      stack = [];
+      fullReason = null;
+      paragraph.clear();
       reproIsNext = false;
     }
     if (line.startsWith("Short reproduction command (experimental):")) {
       reproIsNext = true;
     }
   }
   return records;
 }