Debugger with previous version feature

A method comprising:

• receiving a request to compile a current version of a program for debug;
• identifying, by an integrated development environment, a previous version of an element of the program, wherein the previous version of the element is identified by comparing the current version of the program to a previous version of the program, and the previous version of the element and a current version of the element are different;
• inserting the previous version of the element into the current version of the program;
• creating a compiler directive identifying the previous version of the element, wherein the compiler directive instructs a compiler to designate the previous version of the element unreachable during the execution of the current version of the program during debug unless the current version of the program is modified so that the previous version of the element is called and executed in place of the current version of the element;
• and
• compiling the current version of the program for debug.