There's a bit of a reshuffle of the ExplicitCastExpr subclasses:
- The existing ConditionalCheckedCastExpr expression node now represents
"as?".
- A new ForcedCheckedCastExpr node represents "as" when it is a
downcast.
- CoerceExpr represents "as" when it is a coercion.
- A new UnresolvedCheckedCastExpr node describes "as" before it has
been type-checked down to ForcedCheckedCastExpr or CoerceExpr. This
wasn't a strictly necessary change, but it helps us detangle what's
going on.
There are a few new diagnostics to help users avoid getting bitten by
as/as? mistakes:
- Custom errors when a forced downcast (as) is used as the operand
of postfix '!' or '?', with Fix-Its to remove the '!' or make the
downcast conditional (with as?), respectively.
- A warning when a forced downcast is injected into an optional,
with a suggestion to use a conditional downcast.
- A new error when the postfix '!' is used for a contextual
downcast, with a Fix-It to replace it with "as T" with the
contextual type T.
Lots of test updates, none of which felt like regressions. The new
tests are in test/expr/cast/optionals.swift.
Addresses <rdar://problem/17000058>
Swift SVN r18556
Collecting all of the designated initializers into the class
definition itself gives us the complete story in one location, which
improves consistency.
Swift SVN r15088
An initializer outside of the class's defining module won't
necessarily have access to all of the stored properties of the class
to initialize them (and wouldn't be resilient against changes even if
it did), so it must delegate.
Swift SVN r12302
There's a lot more work to do here, but start to categorize tests
along the lines of what a specification might look like, with
directories (chapters) for basic concepts, declarations, expressions,
statements, etc.
Swift SVN r9958
Break cycles agressively when we find circular class inheritance. The
stronger AST invariants prevent us from having to check for loops
everywhere in the front end.
Swift SVN r7325
Detect duplicate and multiple inheritance, clean up diagnostics, and
unify the code that checks the types in the inheritance clause with
the code that sets the superclass and protocol lists.
Swift SVN r6706
