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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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5 changed files with 20 additions and 16 deletions
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4
src/libexpr/value-to-xml.hh
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@ -9,6 +9,6 @@
namespace nix {
void printValueAsXML(EvalState & state, bool strict, bool location,
Value & v, std::ostream & out, PathSet & context);
Value & v, std::ostream & out, PathSet & context, const Pos & pos);
}