assert-call

It's used only as a dev dependency in 4 crates.

Depender (with downloads and own rev deps)			assert-call version
210	1	mcp-attr	dev	^0.1.2
120	1	sigwake	dev	^0.1.1
110	1	jsoncall	dev	^0.1.2
		sigmut	dev	^0.1.1