diff --git a/compiler/semstmts.nim b/compiler/semstmts.nim
index 287f81b76d..74cca6d0c5 100644
--- a/compiler/semstmts.nim
+++ b/compiler/semstmts.nim
@@ -150,9 +150,12 @@ proc discardCheck(c: PContext, result: PNode) =
         while n.kind in skipForDiscardable: n = n.lastSon
         var s = "expression '" & $n & "' is of type '" &
             result.typ.typeToString & "' and has to be discarded"
+        if result.info.line != n.info.line or
+           result.info.fileIndex != n.info.fileIndex:
+          s.add "; start of expression here: " & $result.info
         if result.typ.kind == tyProc:
           s.add "; for a function call use ()"
-        localError(n.info,  s)
+        localError(n.info, s)
 
 proc semIf(c: PContext, n: PNode): PNode =
   result = n
diff --git a/tests/discard/tneedsdiscard.nim b/tests/discard/tneedsdiscard.nim
index 509e8233b3..8d59e7fec0 100644
--- a/tests/discard/tneedsdiscard.nim
+++ b/tests/discard/tneedsdiscard.nim
@@ -1,6 +1,6 @@
 discard """
   line: 10
-  errormsg: '''expression 'open(f, "arg.txt", fmRead, -1)' is of type 'bool' and has to be discarded'''
+  errormsg: '''expression 'open(f, "arg.txt", fmRead, -1)' is of type 'bool' and has to be discarded; start of expression here: tneedsdiscard.nim(7, 2)'''
 """
 
 proc p =