The SILGen testsuite consists of valid Swift code covering most language
features. We use these tests to verify that no unknown nodes are in the
file's libSyntax tree. That way we will (hopefully) catch any future
changes or additions to the language which are not implemented in
libSyntax.
Because of a ill-advised core team decision, Swift now
allows @_inlineable root initializers on types that
are not @_fixed_layout (aa85e4512f).
Since stored property initializers of types that are not
@_fixed_layout are permitted to reference non-public symbols,
they cannot be serialized and must instead have public
linkage. This negates most of the benefit of inlining the
constructor in the first place, but oh well.
This does not affect resilient builds.
Fixes <rdar://problem/38439363>.
We don't want @_fixed_layout to apply to static properties, or you
get fun consequences like not being able to change static stored
properties defined in extensions of imported types to computed.
Now that we enforce the restriction that they can only reference public
symbols, we can allow the optimizer to fully inline them away in client
code.
This is the second part of <rdar://problem/36454839>.
