Fix range violation with index expressions

makefile

@@ -100,7 +100,8 @@ DEBUG_SERVER_FLAGS := -Icontainers/src\
 	-Ilibdparse/src\
 	-wi\
 	-g\
-	-ofbin/dcd-server
+	-ofbin/dcd-server\
+	-J.
 
 GDC_SERVER_FLAGS := -Icontainers/src\
 	-Imsgpack-d/src\

src/autocomplete.d

@@ -727,11 +727,13 @@ ACSymbol*[] getSymbolsByTokenChain(T)(Scope* completionScope,
 				if (!p.isSliceExpression())
 				{
 					symbols = symbols[0].type is null ? [] : [symbols[0].type];
+					if (symbols.length == 0)
+						break loop;
 				}
 			}
 			else if (symbols[0].qualifier == SymbolQualifier.assocArray)
 			{
-				symbols = symbols[0].type is null ? [] :[symbols[0].type];
+				symbols = symbols[0].type is null ? [] : [symbols[0].type];
 				skip();
 			}
 			else