DebugFn

DebugFn is used at run time in 5 crates. It is a direct run-time dependency in 3 crates.

Depender (with downloads and own rev deps)			DebugFn version
750	2	kbvm		^1.0.0
290	2	wl-client-builder		^1.0.0
160		kbvm-cli		^1.0.0