A CTree = (Node x [CTree]) is a Node associated with a list of subtrees called branches.
Tree simplifyPattern(Tree pattern)
Simplify a block-diagram pattern by computing its numerical sub-expressions.
Tree evalprocess(Tree eqlist)
Eval the definition of 'process'.
Tree evaldocexpr(Tree docexpr, Tree eqlist)
Tree pushValueDef(Tree id, Tree def, Tree lenv)
Push a new layer and add a single definition.