Compile error for transitive dependencies

[Nicolai Parlog]

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 Hi!

If module A requires B and B requires C, A can not be compiled without
C on the module path.

	error: module not found: C
	1 error

This is a little irritating but maybe it was done on purpose to ensure
fidelity across all phases. If that is so and the behavior will remain
unchanged, the error message should be improved, though.

Note that the error message does not point to a concrete location,
which makes sense because the source files under compilation are
error-free. But it also leaves the developer in the dark about which
dependency caused the problem. The message should clear that up with
something like this:

	error: module not found: C (C is required by B is required by A)
	1 error

This may be my last mail to this list this year, so I want to wish
everybody a happy new year! The module system took a huge leap from
where it was a year ago and I can only imagine how much work that must
have been. Kudos! I'm looking forward to 2017 and the release of Java
9. :)

 so long ... Nicolai



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