### 2.4 Core source library functions

To use the functions described in this section, you will need to load the `(lepton library)` module.

Variable: %default-source-library

  Default source library used in the tools.

Function: source-library-contents library

  Returns the contents of source library.

Function: set-source-library-contents! library contents

  Sets the contents of given source library into contents. The value of contents must be a list of paths where source files are stored or `'()`.