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-rw-r--r--src/preamble.js4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/preamble.js b/src/preamble.js
index 1ed1b6eb..4d473ee3 100644
--- a/src/preamble.js
+++ b/src/preamble.js
@@ -8,8 +8,8 @@ var __THREW__ = false; // Used in checking for thrown exceptions.
var __ATEXIT__ = [];
-var HEAP = [0];
-var HEAPTOP = 1; // Leave 0 as an invalid address, 'NULL'
+var HEAP = intArrayFromString('(null)'); // So printing %s of NULL gives '(null)'
+var HEAPTOP = HEAP.length+1; // Leave 0 as an invalid address, 'NULL'
#if SAFE_HEAP
// Semi-manual memory corruption debugging