US Patent 8261240 Debugging lazily evaluated program components

A system and method for facilitating debugging of a computer program is provided. Mechanisms of the present invention facilitate presenting information and enable a developer to interact with a lazily evaluated program component. A debugging system may display data associated with a lazily evaluated program component, and may enable the programmer to control evaluation and viewing of elements of the lazily evaluated program component. In response to a user command, a debugging system may evaluate elements of the program component and display associated data. A user interface enables a user to view, interact with, and debug lazily evaluated program components as well as a program containing such components.