Don't use GAP 4.9 multi-arg lambdas

Resolves #27
gap-packages · May 11, 2018 · 10dac21 · 10dac21
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diff --git a/CHANGES.md b/CHANGES.md
@@ -3,6 +3,7 @@ This file describes changes in the GAP package 'polycyclic'.
 X.YY (YYYY-MM-D)
 
   * Fixed a bug in OneCoboundariesCR which lead to an error in OneCohomologyCR
+  * Restored compatibility with GAP versions before 4.9
   * ...
 
 2.13.1 (2018-04-27)

diff --git a/gap/exam/generic.gi b/gap/exam/generic.gi
@@ -86,7 +86,7 @@ InstallGlobalFunction( UnitriangularPcpGroup, function( n, p )
     od;
 
     # read of pc presentation
-    pairs := ListX([1..n-1], i -> [1..n-i], {i,j} -> [j, i+j]);
+    pairs := ListX([1..n-1], i -> [1..n-i], function(i,j) return [j, i+j]; end);
     for i in [1..l] do
 
         # commutators