From @zoffixznet

$ echo 'Int.^compose' > Foo.pm6; echo 'use Foo' > Bar.pm6; perl6 -I. -MBar -e ''
===SORRY!===
STable conflict detected during deserialization.
(Probable attempt to load two modules that cannot be loaded together).

From @jnthn

On Wed Aug 10 12​:43​:38 2016, cpan@​zoffix.com wrote​:

$ echo 'Int.^compose' > Foo.pm6; echo 'use Foo' > Bar.pm6; perl6 -I.
-MBar -e ''
===SORRY!===
STable conflict detected during deserialization.
(Probable attempt to load two modules that cannot be loaded together).

This needs a better error (we have the data available now to say which type, and almost certainly can say which modules too, and shouldn't mention STables which are an implementation detail).

However, it's not expected that precompilation and module load-time monkey-patching of things will work together. Add "no precompilation". (It may also be that adding a BEGIN is sufficient to avoid the problem.)

The RT System itself - Status changed from 'new' to 'open'