From f3770ba1d675ed952012cbfc8dd38b823e1d3ca7 Mon Sep 17 00:00:00 2001
From: Sebastian Wilzbach <seb@wilzba.ch>
Date: Wed, 21 Jun 2017 09:58:21 +0200
Subject: [PATCH] Fix Issue 17539 - std.parallellism.parallel triggers
 'statement not reachable'

---
 std/parallelism.d | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/std/parallelism.d b/std/parallelism.d
index 51d322172d0..3207bb56d9b 100644
--- a/std/parallelism.d
+++ b/std/parallelism.d
@@ -3500,7 +3500,7 @@ int doSizeZeroCase(R, Delegate)(ref ParallelForeach!R p, Delegate dg)
                 {
                     res = dg(elem);
                 }
-                if (res) foreachErr();
+                if (res) break;
                 index++;
             }
         }
@@ -3516,10 +3516,11 @@ int doSizeZeroCase(R, Delegate)(ref ParallelForeach!R p, Delegate dg)
                 {
                     res = dg(elem);
                 }
-                if (res) foreachErr();
+                if (res) break;
                 index++;
             }
         }
+        if (res) foreachErr;
         return res;
     }
 }
@@ -4624,3 +4625,12 @@ version(unittest)
         arr.parallel.each!"a++";
     })));
 }
+
+// https://issues.dlang.org/show_bug.cgi?id=17539
+@system unittest
+{
+    import std.random : rndGen;
+    // ensure compilation
+    try foreach (rnd; rndGen.parallel) break;
+    catch (ParallelForeachError e) {}
+}