From dd518574ff7679886c1064dd673d864cbf6c6a88 Mon Sep 17 00:00:00 2001
From: kalmar <kalmar@amu.edu.pl>
Date: Mon, 10 Jul 2017 19:27:28 +0200
Subject: [PATCH] fix: zero result coeffs before jumping into loopy mul!

---
 src/GroupRings.jl | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/GroupRings.jl b/src/GroupRings.jl
index f5e326a..aa41ecb 100644
--- a/src/GroupRings.jl
+++ b/src/GroupRings.jl
@@ -327,6 +327,7 @@ function mul!{T}(X::AbstractVector{T}, Y::AbstractVector{T},
 end
 
 function mul!(result::GroupRingElem, X::GroupRingElem, Y::GroupRingElem)
+   result.coeffs *= 0
    mul!(X.coeffs, Y.coeffs, parent(X).pm, result.coeffs)
    return result
 end