eliminate ambiguity

src/tracker/scalar.jl

@@ -61,7 +61,7 @@ for (M, f, arity) in DiffRules.diffrules()
   end
 end
 
-# Eliminating ambiguous
+# Eliminating ambiguity
 import Base:^
 
 ^(a::TrackedReal, b::Integer) = track(^, a, b)

test/tracker.jl

@@ -75,6 +75,8 @@ end
 
 @test (param([1,2,3]) .< 2) == [true, false, false]
 
+@test param(2)^2 == 4.0
+
 @testset "Intermediates" begin
   x = param([1])
   l = sum((x .+ x).^2)