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-rw-r--r--src/lem_interp/interp.lem2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lem_interp/interp.lem b/src/lem_interp/interp.lem
index 3ea2a137..bc9d33b2 100644
--- a/src/lem_interp/interp.lem
+++ b/src/lem_interp/interp.lem
@@ -711,7 +711,7 @@ and interp_main t_level l_env l_mem exp =
(match find_extern externs id with
| Just(str) ->
(Action (Call_extern str v) (Frame (Id "0") (E_id (Id "0")) le lm Top), lm, le)
- | Nothing -> (Error "Unknown function call",lm,le) end)
+ | Nothing -> (Error (String.stringAppend "Unknown function call " (get_id id)),lm,le) end)
end) end) end) end)
| out -> out end)
| E_app_infix l op r ->