### 19.1 Environment

The environment in GCL which is passed to macroexpand and other functions requesting an environment, should be a list of 3 lists. The first list looks like ((v1 val1) (v2 val2) ..) where vi are variables and vali are their values. The second is a list of ((fname1 . fbody1) (fname2 . fbody2) ...) where fbody1 is either (macro lambda-list lambda-body) or (lambda-list lambda-body) depending on whether this is a macro or a function. The third list contains tags and blocks.