From bc770aac72f5d92484ebf989c0a9a5c2877e408b Mon Sep 17 00:00:00 2001
From: Hiroki Noda <kubo39@gmail.com>
Date: Tue, 10 Mar 2020 08:08:19 +0900
Subject: [PATCH] Fix Issue 20656 - cannot compile live function without
 -preview=dip1021

---
 src/dmd/semantic3.d         |  3 ++-
 test/compilable/test20656.d | 11 +++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 test/compilable/test20656.d

diff --git a/src/dmd/semantic3.d b/src/dmd/semantic3.d
index 1a287d4eb42c..3bd55861b6d1 100644
--- a/src/dmd/semantic3.d
+++ b/src/dmd/semantic3.d
@@ -1336,7 +1336,8 @@ private extern(C++) final class Semantic3Visitor : Visitor
         }
 
         // Do live analysis
-        if (funcdecl.fbody && funcdecl.type.ty != Terror && funcdecl.type.isTypeFunction().islive)
+        if (global.params.useDIP1021 && funcdecl.fbody && funcdecl.type.ty != Terror &&
+            funcdecl.type.isTypeFunction().islive)
         {
             oblive(funcdecl);
         }
diff --git a/test/compilable/test20656.d b/test/compilable/test20656.d
new file mode 100644
index 000000000000..f68d65470263
--- /dev/null
+++ b/test/compilable/test20656.d
@@ -0,0 +1,11 @@
+// https://issues.dlang.org/show_bug.cgi?id=20656
+
+import core.stdc.stdlib : free, malloc;
+
+@live
+void main()
+{
+    auto p = malloc(1);
+    free(p);
+    free(p);
+}