idle parse error due to commit 496501b

After I rebased my f90 code to the current master branch and started working with it I stumbled upon the following error which I traced to commit 496501b, so I guess the problem is not the commit itself. When I edit a file, idle reparsing fails - sometimes. With the fortran parser it fails most of the time, but I also saw it in lisp mode. Line
  (semantic-throw-on-input 'lex)
in lex.el (line 815) causes this problem.
In the case of the fortran lexer, the idle parse error message is triggered because the lexer calls itself recursively. If throw-on-input throws at an inner recursion step, the lexer aborts, and the outer recursion thinks it is in an infinite loop (the inner lexer has not advanced semantic-lex-end), as it does not know about the throwing. I cannot remember where I took the idea of calling the lexer recursively, but I think I am not the only one doing this.

Martin

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