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primops/derivation: use position of currently evaluated attribute

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* The position of the `name`-attribute appears in the trace.
* If e.g. `meta` has no `outPath`-attribute, a `cannot coerce set to
  string` error will be thrown where `pos` points to `name =` which is
  highly misleading.
This commit is contained in:
Maximilian Bosch 2021-01-08 22:09:35 +01:00
parent 525015be7f
commit 3550a32b25
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1 changed files with 1 additions and 1 deletions
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src/libexpr/primops.cc
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@ -953,7 +953,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
} }
} else { } else {
auto s = state.coerceToString(posDrvName, *i->value, context, true); auto s = state.coerceToString(*i->pos, *i->value, context, true);
drv.env.emplace(key, s); drv.env.emplace(key, s);
if (i->name == state.sBuilder) drv.builder = s; if (i->name == state.sBuilder) drv.builder = s;
else if (i->name == state.sSystem) drv.platform = s; else if (i->name == state.sSystem) drv.platform = s;