* Fixed builtins.genericClosure.

1 files changed, 7 insertions, 3 deletions

diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index f59ea99e5d41..0e4f2519ace1 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -73,21 +73,25 @@ std::ostream & operator << (std::ostream & str, Value & v)
 }
 
 
-string showType(Value & v)
+string showType(const Value & v)
 {
     switch (v.type) {
         case tInt: return "an integer";
         case tBool: return "a boolean";
         case tString: return "a string";
         case tPath: return "a path";
+        case tNull: return "null";
         case tAttrs: return "an attribute set";
         case tList: return "a list";
-        case tNull: return "null";
+        case tThunk: return "a thunk";
+        case tApp: return "a function application";
         case tLambda: return "a function";
+        case tCopy: return "a copy";
+        case tBlackhole: return "a black hole";
         case tPrimOp: return "a built-in function";
         case tPrimOpApp: return "a partially applied built-in function";
-        default: throw Error(format("unknown type: %1%") % v.type);
     }
+    abort();
 }