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Ben Burdette 2020-11-09 17:04:52 -07:00
parent 107c91f5fe
commit 6c2933a8d7
1 changed files with 2 additions and 2 deletions
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src/libexpr/eval.cc
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@ -1370,11 +1370,11 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
if (j != args.end()) { if (j != args.end()) {
actualArgs->attrs->push_back(*j); actualArgs->attrs->push_back(*j);
} else if (!i.def) { } else if (!i.def) {
throwUndefinedVarError(R"(cannot auto-call a function that has an argument without a default value ('%1%') throwUndefinedVarError(i.pos, R"(cannot auto-call a function that has an argument without a default value ('%1%')
An 'auto-call' is when a nix expression is evaluated without any external arguments. If that An 'auto-call' is when a nix expression is evaluated without any external arguments. If that
nix expression is a function, and that function's arguments all have default values, then all is well. nix expression is a function, and that function's arguments all have default values, then all is well.
But if the function arguments don't have default values, then evaluation fails. But if the function arguments don't have default values, evaluation fails.
The classic case for this error is evaluating a nix file with nix-build that expects to be evaluated by callPackage. The classic case for this error is evaluating a nix file with nix-build that expects to be evaluated by callPackage.
# in 'callPackage' format: expression is a function that takes an argument 'stdenv'. # in 'callPackage' format: expression is a function that takes an argument 'stdenv'.