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missing argument error

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This commit is contained in:
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))
{
e.addTrace(std::nullopt, s, s2);
@ -1365,7 +1373,7 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
if (j != args.end()) {
actualArgs->attrs->push_back(*j);
} 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.
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.
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.
# in 'callPackage' format: expression is a function that takes an argument 'stdenv'.
# callPackage would implicitly pull 'stdenv' from nixpkgs, then call this function.

1
src/libexpr/nixexpr.hh
View file

@ -17,6 +17,7 @@ MakeError(ThrownError, AssertionError);
MakeError(Abort, EvalError);
MakeError(TypeError, EvalError);
MakeError(UndefinedVarError, Error);
MakeError(MissingArgumentError, Error);
MakeError(RestrictedPathError, Error);