diff --git a/glslang/Include/Common.h b/glslang/Include/Common.h
index 8c4ccf2c..df07d645 100644
--- a/glslang/Include/Common.h
+++ b/glslang/Include/Common.h
@@ -98,6 +98,16 @@ inline TString* NewPoolTString(const char* s)
 	return new(memory) TString(s);
 }
 
+template<class T> inline T* NewPoolObject(T)
+{
+    return new(GetThreadPoolAllocator().allocate(sizeof(T))) T;
+}
+
+template<class T> inline T* NewPoolObject(T, int instances)
+{
+    return new(GetThreadPoolAllocator().allocate(instances * sizeof(T))) T[instances];
+}
+
 //
 // Pool allocator versions of vectors, lists, and maps
 //
diff --git a/glslang/MachineIndependent/ParseHelper.cpp b/glslang/MachineIndependent/ParseHelper.cpp
index 409c5a9d..24b224aa 100644
--- a/glslang/MachineIndependent/ParseHelper.cpp
+++ b/glslang/MachineIndependent/ParseHelper.cpp
@@ -413,9 +413,6 @@ TIntermTyped* TParseContext::handleVariable(TSourceLoc loc, TSymbol* symbol, TSt
         if (! variable)
             variable = new TVariable(string, TType(EbtVoid));
 
-        // don't delete $1.string, it's used by error recovery, and the pool
-        // pop will reclaim the memory
-
         if (variable->getType().getQualifier().storage == EvqConst)
             node = intermediate.addConstantUnion(variable->getConstArray(), variable->getType(), loc);
         else {
@@ -833,10 +830,9 @@ TIntermAggregate* TParseContext::handleFunctionDefinition(TSourceLoc loc, TFunct
             TVariable *variable = new TVariable(param.name, *param.type);
 
             // Insert the parameters with name in the symbol table.
-            if (! symbolTable.insert(*variable)) {
+            if (! symbolTable.insert(*variable))
                 error(loc, "redefinition", variable->getName().c_str(), "");
-                delete variable;
-            } else {
+            else {
                 // Transfer ownership of name pointer to symbol table.
                 param.name = 0;
 
@@ -2144,7 +2140,7 @@ bool TParseContext::redeclareBuiltinBlock(TSourceLoc loc, TTypeList& typeList, c
         return false;
     }
 
-    // Copy the to make a writable version, to insert into the block table after editing
+    // Copy the block to make a writable version, to insert into the block table after editing.
     block = symbolTable.copyUpDeferredInsert(block);
 
     if (block->getType().getBasicType() != EbtBlock) {
diff --git a/glslang/MachineIndependent/ShaderLang.cpp b/glslang/MachineIndependent/ShaderLang.cpp
index 3e137d31..d893020e 100644
--- a/glslang/MachineIndependent/ShaderLang.cpp
+++ b/glslang/MachineIndependent/ShaderLang.cpp
@@ -501,7 +501,7 @@ bool CompileDeferred(
     lengths[numStrings + 1] = strlen(strings[numStrings + 1]);
     TInputScanner fullInput(numStrings + 2, strings, lengths, 1, 1);
 
-    // Push a new symbol allocation scope that can for the shader's globals.
+    // Push a new symbol allocation scope that will get used for the shader's globals.
     symbolTable.push();
 
     // Parse the full shader.
diff --git a/glslang/MachineIndependent/SymbolTable.cpp b/glslang/MachineIndependent/SymbolTable.cpp
index a801193a..dcf84dc2 100644
--- a/glslang/MachineIndependent/SymbolTable.cpp
+++ b/glslang/MachineIndependent/SymbolTable.cpp
@@ -249,8 +249,10 @@ TVariable::TVariable(const TVariable& copyOf) : TSymbol(copyOf)
 {	
     type.deepCopy(copyOf.type);
     userType = copyOf.userType;
+    numExtensions = 0;
     extensions = 0;
-    setExtensions(copyOf.numExtensions, copyOf.extensions);
+    if (copyOf.numExtensions > 0)
+        setExtensions(copyOf.numExtensions, copyOf.extensions);
 
     if (! copyOf.unionArray.empty()) {
         assert(!copyOf.type.getStruct());
@@ -276,8 +278,10 @@ TFunction::TFunction(const TFunction& copyOf) : TSymbol(copyOf)
         parameters.back().copyParam(copyOf.parameters[i]);
     }
 
-    extensions = 0;    
-    setExtensions(copyOf.numExtensions, copyOf.extensions);
+    numExtensions = 0;
+    extensions = 0;
+    if (copyOf.extensions > 0)
+        setExtensions(copyOf.numExtensions, copyOf.extensions);
     returnType.deepCopy(copyOf.returnType);
     mangledName = copyOf.mangledName;
     op = copyOf.op;
diff --git a/glslang/MachineIndependent/SymbolTable.h b/glslang/MachineIndependent/SymbolTable.h
index 0206ef9c..bd1a5c9c 100644
--- a/glslang/MachineIndependent/SymbolTable.h
+++ b/glslang/MachineIndependent/SymbolTable.h
@@ -83,7 +83,7 @@ public:
     POOL_ALLOCATOR_NEW_DELETE(GetThreadPoolAllocator())
     explicit TSymbol(const TString *n) :  name(n), writable(true), numExtensions(0), extensions(0) { }
 	virtual TSymbol* clone() const = 0;
-    virtual ~TSymbol() { delete [] extensions; }
+    virtual ~TSymbol() { }  // rely on all symbol owned memory coming from the pool
 
     virtual const TString& getName() const { return *name; }
     virtual void changeName(const TString* newName) { name = newName; }
@@ -100,8 +100,9 @@ public:
     virtual void setExtensions(int num, const char* const exts[])
     {
         assert(extensions == 0);
+        assert(num > 0);
         numExtensions = num;
-        extensions = new const char*[numExtensions];
+        extensions = NewPoolObject(exts[0], num);
         for (int e = 0; e < num; ++e)
             extensions[e] = exts[e];
     }