From e2f3b2eb42a0ceca36ce00973bd2d49b1a3e6a2c Mon Sep 17 00:00:00 2001
From: regnat <rg@regnat.ovh>
Date: Mon, 22 Feb 2021 16:13:09 +0100
Subject: [PATCH] Make missing auto-call arguments throw an eval error

The PR #4240 changed messag of the error that was thrown when an auto-called
function was missing an argument.
However this change also changed the type of the error, from `EvalError`
to a new `MissingArgumentError`. This broke hydra which was relying on
an `EvalError` being thrown.

Make `MissingArgumentError` a subclass of `EvalError` to un-break hydra.
---
 src/libexpr/nixexpr.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index cbe9a45bf..8df8055b3 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -17,7 +17,7 @@ MakeError(ThrownError, AssertionError);
 MakeError(Abort, EvalError);
 MakeError(TypeError, EvalError);
 MakeError(UndefinedVarError, Error);
-MakeError(MissingArgumentError, Error);
+MakeError(MissingArgumentError, EvalError);
 MakeError(RestrictedPathError, Error);