From c0a567e1963faaf9b16f772d6b4e76496a88ed32 Mon Sep 17 00:00:00 2001
From: Ben Burdette <bburdette@protonmail.com>
Date: Tue, 29 Mar 2022 16:44:47 -0600
Subject: [PATCH] remove const_cast

---
 src/libexpr/eval.cc | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index f162f3e0b..cc0380d4a 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -937,7 +937,7 @@ LocalNoInlineNoReturn(void throwAssertionError(const Pos & pos, const char * s,
     throw error;
 }
 
-LocalNoInlineNoReturn(void throwUndefinedVarError(const Pos & pos, const char * s, const string & s1, Env & env, Expr &expr))
+LocalNoInlineNoReturn(void throwUndefinedVarError(const Pos & pos, const char * s, const string & s1, Env & env, const Expr &expr))
 {
     auto error = UndefinedVarError({
         .msg = hintfmt(s, s1),
@@ -1053,8 +1053,7 @@ inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
             return j->value;
         }
         if (!env->prevWith) {
-            // TODO deal with const_cast
-            throwUndefinedVarError(var.pos, "undefined variable '%1%'", var.name, *env, *const_cast<ExprVar*>(&var));
+            throwUndefinedVarError(var.pos, "undefined variable '%1%'", var.name, *env, var);
         }
         for (size_t l = env->prevWith; l; --l, env = env->up) ;
     }