proposed fix for #3601

Author: citius2280

M2/Macaulay2/packages/gfanInterface.m2

@@ -751,14 +751,15 @@ gfanConvertToNewRing (PolynomialRing) := R1 -> (
   --This method does all of the actual conversions.
   --Every other gfanConvertToNewRing uses rings 
   --produced by this method.
-  R1Gens := gens R1;
-  numDigits := length (toString (#R1Gens));
-  R2 := (coefficientRing R1) new Array from (for i in 1..#R1Gens list (
-    value ("x" | demark ("",for i from 1 to numDigits-(length toString i) list "0") | toString i)
-  ) );
-  R2Gens := gens R2;
-  generatorMapping := for i in 0..#(gens R1) - 1 list (R1Gens#i =>R2Gens#i);
-  return (map(R2, R1, generatorMapping), R2);
+  	R1Gens := gens R1;
+  	numDigits := length (toString (#R1Gens));
+	varstr := (for i in 1..#R1Gens list "x" | demark ("",for j from 1 to numDigits-(length toString i) list "0") | toString i);
+	var := new Dictionary;
+	varlist = for i in varstr list getGlobalSymbol(var,i);
+ 	R2 := (coefficientRing R1) new Array from varlist;
+ 	R2Gens := gens R2;
+	generatorMapping := for i in 0..#(gens R1) - 1 list (R1Gens#i =>R2Gens#i);
+	return (map(R2, R1, generatorMapping), R2);
 )
 
 gfanConvertToNewRing (RingElement) := f -> (