Protect against accidental merges to master

build/scripts/check-branch.ps1

+# This script is meant to guard against accidental merges of our core
+# branches.  For instance it should guard against future -> master merges
+# that weren't intended.  
+
+if (${env:ghprbTargetBranch} -eq "master") {
+    [string]$output = git branch --contains 00677493dc69ceac4e9e4c01a73be90c75e7d340 
+    if ($output.Length -ne 0) {
+        write-host "Error!!! Accidental merge of future into master"
+        exit 1
+    }
+}
+

cibuild.cmd

@@ -38,6 +38,8 @@ if defined Perf (
 
 call "C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Tools\VsDevCmd.bat" || goto :BuildFailed
 
+powershell -noprofile -executionPolicy RemoteSigned -command "%RoslynRoot%\build\scripts\check-branch.ps1" || goto :BuildFailed
+
 REM Restore the NuGet packages 
 if "%BuildRestore%" == "true" (
     call "%RoslynRoot%\Restore.cmd" || goto :BuildFailed