269fd475ad
Now it is possible to write anywhere in a Ligo source file and have error messages refer to the correct file and line. This is done by extending the lexer to recognise #line directives (generated by CPP). I added the stage "cpp" for the --verbose command-line option: if given, the preprocessed source file is created in the current directory with the name <input>.pp.li, where <input>.li is the original input file. Also the CPP command actually run is printed. I added setter to modules [Pos] and [Region].