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authorEelco Dolstra <e.dolstra@tudelft.nl>2004-04-05T22·27+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2004-04-05T22·27+0000
commit59b94ee18ac0cba5c7b261ee72550a4d3db0acb5 (patch)
tree9dbe6721699439cda3ce68ac86acbe38e9839e66 /Makefile.am
parenta520b1cbc3327dfb8e3c6f503dfd0bd41e0a6d55 (diff)
* When something goes wrong in the evaluation of a Nix expression,
  print a nice backtrace of the stack, rather than vomiting a gigantic
  (and useless) aterm on the screen.  Example:

    error: while evaluating file `.../pkgs/system/test.nix':
    while evaluating attribute `subversion' at `.../pkgs/system/all-packages-generic.nix', line 533:
    while evaluating function at `.../pkgs/applications/version-management/subversion/default.nix', line 1:
    assertion failed at `.../pkgs/applications/version-management/subversion/default.nix', line 13

  Since the Nix expression language is lazy, the trace may be
  misleading.  The purpose is to provide a hint as to the location of
  the problem.    
  

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