a compilation issue caused by the order of two 'requires' directives

[Dmitry Bessonov]

Hello,

While playing with the recent JigSaw build
I came across a strange compilation issue which exposes
the inability to resolve module dependences in case
when two 'requires' clauses are listed in particular order.

The structure is the following - 3 modules are compiled
and installed one after the other.

module bar @ 1.0 {   }

module foo @ 1.0 {
    requires optional bar @>1.0;
}

module test @ 1.0 {
     requires bar;
     requires foo;
}

The compilation fails for the last module ('test').
To compile module successfully it is just needed
to interchange two 'requires' clauses in module 'test'.

Best regards,
Dmitry