  We propose a test of macrorealism that exploits the contextuality of two-time
correlation functions to escape the so-called "clumsiness loophole" that
plagues Leggett-Garg inequalities. The non-contextuality of reduced joint
probability distributions is proven to be an unequivocal criterion to guarantee
that measurements are carried out in the ideally-weak measurement regime of a
class of generalized von Neumann measurements. In this regime, testing the
so-called "no-signaling in time" condition allows to uncontextually ascertain
whether a property of a given system is macrorealistic or non-macrorealistic.
The resulting protocol allows for tests of macrorealism in situations where
Leggett-Garg inequalities and ideal negative measurement cannot be used at all.

Quantum Physics