From a050b73a46006343ac90f21d9ec0ce0bbe902558 Mon Sep 17 00:00:00 2001
From: Antonio Cunei <antonio.cunei@typesafe.com>
Date: Tue, 14 Nov 2017 18:50:36 +0100
Subject: [PATCH] Workaround for scala/bug#10605

templateStats() is not thread-safe in 2.12.x (at least up to 2.12.4)
---
 main/src/main/scala/sbt/internal/parser/SbtParser.scala | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/main/src/main/scala/sbt/internal/parser/SbtParser.scala b/main/src/main/scala/sbt/internal/parser/SbtParser.scala
index 0e87b2a87..b54ac503c 100644
--- a/main/src/main/scala/sbt/internal/parser/SbtParser.scala
+++ b/main/src/main/scala/sbt/internal/parser/SbtParser.scala
@@ -142,7 +142,9 @@ private[sbt] object SbtParser {
     val wrapperFile = new BatchSourceFile(reporterId, code)
     val unit = new CompilationUnit(wrapperFile)
     val parser = new syntaxAnalyzer.UnitParser(unit)
-    val parsedTrees = parser.templateStats()
+    val parsedTrees = SbtParser.synchronized { // see https://github.com/scala/bug/issues/10605
+      parser.templateStats()
+    }
     parser.accept(scala.tools.nsc.ast.parser.Tokens.EOF)
     globalReporter.throwParserErrorsIfAny(reporter, filePath)
     parsedTrees -> reporterId