Fix crash when assigning to bindings #199

Job	Run time
Prepare the run	6s
alpine-linux-x64	0s
linux-x86-hs / build (debug)	1m 10s
linux-x64-hs-zero / build (debug)	1m 19s
linux-x86-hs / build (release)	1m 18s
linux-x64 / build (debug)	1m 18s
linux-cross-compile / build (aarch64)	1m 6s
linux-x64-hs-minimal / build (debug)	1m 19s
linux-x64 / build (release)	1m 14s
linux-cross-compile / build (arm)	1m 6s
linux-cross-compile / build (s390x)	1m 5s
linux-cross-compile / build (ppc64le)	1m 6s
docs / build (debug)	1m 18s
linux-x64-hs-nopch / build (debug)	1m 18s
linux-cross-compile / build (riscv64)	1m 20s
linux-x64-hs-optimized / build (debug)	1m 19s
macos-aarch64 / build (debug)	1m 7s
macos-x64 / build (debug)	1m 3s
macos-aarch64 / build (release)	1m 8s
macos-x64 / build (release)	1m 4s
windows-aarch64 / build (debug)	1m 3s
windows-aarch64 / build (release)	1m 3s
windows-x64 / build (debug)	1s
windows-x64 / build (release)	1s
windows-x64	1s
macos-x64	1s
macos-aarch64	1s
linux-x64	1s
	23m 56s

Provide feedback