  Fast radio bursts (FRBs) are short, intense extragalactic radio bursts of
unknown origin. Recent polarimetric studies have shown that a noticeable
fraction of the repeating FRBs display irregular, short-time variations of the
Faraday rotation measure (RM). Moreover, evidence for rare propagation effects
such as Faraday conversion and polarized attenuation is seen in at least one
FRB repeater. Together, they suggest a highly variable magneto-active
circum-burst environment. In this paper, we report similar behavior in a
globular cluster pulsar binary system PSR B1744-24A. We observe irregular fast
changes of RM with both signs at random orbital phases as well as profile
changes of the circular polarization when the pulsar emission passes close to
the companion. The latter provides strong evidence for Faraday conversion and
circularly polarized attenuation. These similarities between PSR B1744-24A and
some FRB repeaters, as well as the possible binary-produced long-term
periodicity of two active repeaters, and the discovery of a nearby FRB in a
globular cluster, where pulsar binaries are common, all suggest that some
fraction of FRBs have binary companions.
