feat: make it clear when an invalid instance is created (#8) #114

Job	Run time
Clippy	13s
feature checks	31s
fmt	11s
docs	22s
Outdated	9s
Miri (x86_64-unknown-linux-gnu)	31s
Miri (aarch64-unknown-linux-gnu)	33s
Test (aarch64-unknown-linux-gnu, nightly)	38s
Test (aarch64-unknown-linux-gnu, stable)	30s
Test (aarch64-unknown-linux-gnu, 1.64)	3m 52s
Test (i686-unknown-linux-gnu, nightly)	32s
Test (i686-unknown-linux-gnu, stable)	22s
Test (i686-unknown-linux-gnu, 1.64)	3m 56s
Test (x86_64-unknown-linux-gnu, nightly)	16s
Test (x86_64-unknown-linux-gnu, stable)	9s
Test (x86_64-unknown-linux-gnu, 1.64)	3m 36s
	16m 21s

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