Folks

I have a parser that emits an AST and a number of stages after that.  At each 
stage, errors can be detected and I want to emit informative error messages 
about the source of the problem, to include the input file name.

I know there are several ways to do it but I'm looking for an easy way to have 
access to the source file name of a given token, even if its several passes 
down the line.

Any suggestions welcome.

  .bill

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