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namespace Foo {
 
	class Deriv {};
	class Another {};
 
	template <typename T>
	Another operator* ( T x, const Deriv& d ) { return Another();}
}
namespace Bar {
	typedef Foo::Deriv MyDeriv;
	MyDeriv operator* (float x, const MyDeriv& d);
}
 
namespace Bar {
	void f1() {
		Bar::MyDeriv a;
		Bar::MyDeriv b = 3.f * a;
	}
}
 
void f2() {
	Bar::MyDeriv a; 
	Bar::MyDeriv b = 3.f * a;
}
 
int main() {
	// your code goes here
	return 0;
}

prog.cpp: In function 'void f2()':
prog.cpp:24:23: error: conversion from 'Foo::Another' to non-scalar type 'Bar::MyDeriv {aka Foo::Deriv}' requested
  Bar::MyDeriv b = 3.f * a;
                       ^

Standard output is empty