src/Pure/Syntax/README

added sorts.ML, type_infer.ML;

                              Pure/Syntax/

This directory contains the source files for Isabelle's syntax module, which
includes a lexer, parser, pretty printer and macro system. Note that only the
following structures are supposed to be exported:

  Pretty        (generic pretty printing module)
  Scanner       (generic scanner toolbox)

  Syntax        (internal interface to the syntax module)
  BasicSyntax   (part of Syntax made pervasive)

There is no Makefile to compile these files separately; they are compiled as
part of Pure Isabelle.