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missing argument error

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Ben Burdette 2020-11-11 09:29:32 -07:00
parent 7d9037035e
commit 3edfe6090e
2 changed files with 11 additions and 2 deletions
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12
src/libexpr/eval.cc
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@ -660,6 +660,14 @@ LocalNoInlineNoReturn(void throwUndefinedVarError(const Pos & pos, const char *
}); });
} }
LocalNoInlineNoReturn(void throwMissingArgumentError(const Pos & pos, const char * s, const string & s1))
{
throw MissingArgumentError({
.hint = hintfmt(s, s1),
.errPos = pos
});
}
LocalNoInline(void addErrorTrace(Error & e, const char * s, const string & s2)) LocalNoInline(void addErrorTrace(Error & e, const char * s, const string & s2))
{ {
e.addTrace(std::nullopt, s, s2); e.addTrace(std::nullopt, s, s2);
@ -1365,7 +1373,7 @@ 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(i.pos, R"(cannot auto-call a function that has an argument without a default value ('%1%') throwMissingArgumentError(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. 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 If that nix expression is a function, and that function's arguments all have default
@ -1373,7 +1381,7 @@ values, then all is well.
But if the function arguments don't have default values, 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 The classic case for this error is evaluating a nix file that expects
to be evaluated by callPackage. 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'.
# callPackage would implicitly pull 'stdenv' from nixpkgs, then call this function. # callPackage would implicitly pull 'stdenv' from nixpkgs, then call this function.

1
src/libexpr/nixexpr.hh
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@ -17,6 +17,7 @@ MakeError(ThrownError, AssertionError);
MakeError(Abort, EvalError); MakeError(Abort, EvalError);
MakeError(TypeError, EvalError); MakeError(TypeError, EvalError);
MakeError(UndefinedVarError, Error); MakeError(UndefinedVarError, Error);
MakeError(MissingArgumentError, Error);
MakeError(RestrictedPathError, Error); MakeError(RestrictedPathError, Error);