Add missing LineNumberNode to at-swappable call (fixes #257) (#259)

Author: getzdan

src/operators.jl

@@ -138,7 +138,11 @@ macro dataarray_binary_scalar(vectorfunc, scalarfunc, outtype, swappable)
                 if swappable
                     # For /, Array/Number is valid but not Number/Array
                     # All other operators should be swappable
-                    map!(x->Expr(:macrocall, Symbol("@swappable"), x, scalarfunc), fns, fns)
+                    if VERSION < v"0.7.0-DEV.328"
+                        map!(x->Expr(:macrocall, Symbol("@swappable"), x, scalarfunc), fns, fns)
+                    else
+                        map!(x->Expr(:macrocall, Symbol("@swappable"), LineNumberNode(@__LINE__), x, scalarfunc), fns, fns)
+                    end
                 end
                 Expr(:block, fns...)
             end