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What If module `A` depends on an inline function of module `B`? If both modules are on the classpath as seperate .jars, you'd expect that a change to an inline function in module `B` only affects, well, module `B`. But thats not the case, because the functions are inlined in module `A`. A change to an inline function in module `B` would not have any effect because the old version of the function is still inlined in module `A`

Yep! The argument here is exactly what <@U092308M7> said, though. The old inlined code has to use public API so someone could have manually written the same thing.

(And that restriction tends to cover you about 98% of the time into not doing anything stupid.)