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toXML: display errors position

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- This change applies to builtins.toXML and inner workings
- Proof of concept:
  ```nix
  let e = builtins.toXML e; in e
  ```
- Before:
  ```
  $ nix-instantiate --eval poc.nix
  error: infinite recursion encountered
  ```
- After:
  ```
  $ nix-instantiate --eval poc.nix
  error: infinite recursion encountered

       at /data/github/kamadorueda/nix/poc.nix:1:9:

            1| let e = builtins.toXML e; in e
             |
  ```
This commit is contained in:
Kevin Amado 2021-11-13 20:29:31 -05:00
parent bceda30498
commit d0e9e18489
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GPG key ID: FFF341057F503148
5 changed files with 20 additions and 16 deletions
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2
src/nix-instantiate/nix-instantiate.cc
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@ -50,7 +50,7 @@ void processExpr(EvalState & state, const Strings & attrPaths,
else
state.autoCallFunction(autoArgs, v, vRes);
if (output == okXML)
printValueAsXML(state, strict, location, vRes, std::cout, context);
printValueAsXML(state, strict, location, vRes, std::cout, context, noPos);
else if (output == okJSON)
printValueAsJSON(state, strict, vRes, std::cout, context);
else {