From a60cf221e8c116f9b212b69ad52e594ec43bffe4 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Mon, 27 Aug 2018 17:05:20 +0200
Subject: [PATCH] improve the error message for mutability problems that arise
 from implicit converter calls

---
 compiler/semcall.nim | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler/semcall.nim b/compiler/semcall.nim
index 980cfb691a..00b5916320 100644
--- a/compiler/semcall.nim
+++ b/compiler/semcall.nim
@@ -138,7 +138,9 @@ proc effectProblem(f, a: PType; result: var string) =
 
 proc renderNotLValue(n: PNode): string =
   result = $n
-  if n.kind in {nkHiddenStdConv, nkHiddenSubConv, nkHiddenCallConv} and n.len == 2:
+  if n.kind == nkHiddenCallConv and n.len > 1:
+    result = $n[0] & "(" & result & ")"
+  elif n.kind in {nkHiddenStdConv, nkHiddenSubConv} and n.len == 2:
     result = typeToString(n.typ.skipTypes(abstractVar)) & "(" & result & ")"
 
 proc presentFailedCandidates(c: PContext, n: PNode, errors: CandidateErrors):