escape the new variable name, but not the PolyVar call

Author: rdeits

src/mono.jl

@@ -11,7 +11,7 @@ end
 
 function buildpolyvar(var)
   if isa(var, Symbol)
-    esc(:($var = PolyVar($"$var")))
+    :($(esc(var)) = PolyVar($"$var"))
   else
     isa(var, Expr) || error("Expected $var to be a variable name")
     Base.Meta.isexpr(var, :ref) || error("Expected $var to be of the form varname[idxset]")
@@ -20,7 +20,7 @@ function buildpolyvar(var)
     varname = var.args[1]
     prefix = string(var.args[1])
     idxset = var.args[2]
-    esc(:($varname = polyvecvar($prefix, $idxset)))
+    :($(esc(varname)) = polyvecvar($prefix, $idxset))
   end
 end