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Improve error message

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This commit is contained in:
Eelco Dolstra 2020-04-02 19:03:32 +02:00
parent ab47868639
commit e1fc9f6690
1 changed files with 1 additions and 1 deletions
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src/libexpr/primops/fetchTree.cc
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@ -81,7 +81,7 @@ static void prim_fetchTree(EvalState & state, const Pos & pos, Value * * args, V
input = lookupInRegistries(state.store, input).first;
if (evalSettings.pureEval && !input->isImmutable())
throw Error("in pure evaluation mode, 'fetchTree' requires an immutable input");
throw Error("in pure evaluation mode, 'fetchTree' requires an immutable input, at %s", pos);
// FIXME: use fetchOrSubstituteTree
auto [tree, input2] = input->fetchTree(state.store);