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* When something goes wrong in the evaluation of a Nix expression,

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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.
This commit is contained in:
Eelco Dolstra 2004-04-05 22:27:41 +00:00
parent a520b1cbc3
commit 59b94ee18a
8 changed files with 201 additions and 90 deletions
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2
src/nix-instantiate/main.cc
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@ -47,7 +47,7 @@ static void printNixExpr(EvalState & state, Expr e)
return;
}
throw badTerm("top level does not evaluate to one or more Nix expressions", e);
throw Error("expression does not evaluate to one or more derivations");
}