Proposal: #ModuleNameCharacters (revised)

[mark.reinhold at oracle.com]

2017/1/1 15:43:10 -0800, Rémi Forax <forax at univ-mlv.fr>:
> Re-reading this thread after a message sent privately by Ess Kay aksing why
> spaces are supported, i think we should disallow 0x20 (space) too,
> having a module not found because a module name has a trailing space will not
> be fun.

No, that wouldn't be fun, but such module names will never be emitted by
a Java compiler, hence I don't think this type of error will be so common
as to justify banning spaces in module names in all `module-info.class`
files.

- Mark