Introduce the `@preconcurrency` attribute name for `@_predatesConcurrency`,
which has been the favored name in the pitch thread so far. Retain the
old name for now to help smooth migration.
In addition to the predefined cases, like "readnone", "readonly", etc. support providing a custom string, which will be parsed later.
Also, allow multiple effects attributes to be put onto a function.
The `@exclusivity(unchecked)` attribute can be used on variables to selectively disable exclusivity checking.
For completeness, also the `@exclusivity(checked)` variant is supported: it turns on exclusivity checking for specific variables if exclusivity enforcement is disabled by the command line option.
This new attribute is a missing implementation part of SE-0176 (https://github.com/apple/swift-evolution/blob/main/proposals/0176-enforce-exclusive-access-to-memory.md).
rdar://31121356
Replace shallow checks for `OpaqueReturnTypeRepr` with calls to
`hasOpaque`, which ensures that we consider opaque result types in
structural positions.
Adding the ability to add an optional message to the unavailable from
async attribute. This can be used to indicate other possible API to use,
or help explain why it's unavailable.
This cleans up 90 instances of this warning and reduces the build spew
when building on Linux. This helps identify actual issues when
building which can get lost in the stream of warning messages. It also
helps restore the ability to build the compiler with gcc.
These have been subsumed by @_predatesConcurrency. Leave in minimal
parser support that warns about the removal, so we don't fully break
existing source code.
Stage in the parsing for this attribute, nothing else.
Motivated by two important reasons:
1) The pitch for variadic generics does not lay down a concrete syntax
for variadic generic parameters.
2) Paring T... and T* needlessly complicate the lexer as we must now
disambiguate them with respect to other internal operator characters
(e.g. `T...>` must lex as `(T...)>` and not `T ...>`
Which itself adds another motivation
3) We need to start parsing this attribute *now* to avoid condfail'ing
ourselves later.
This attribute creates an unavailable extension with a `Sendable` conformance so that the type is explicity marked as not being `Sendable`.
We also fully suppress diagnostics about unavailable Sendable conformances in Swift 5 mode code. (This is not fully developed yet—it should return to being a warning in concurrent contexts.)
The behavior when a @_nonSendable and a Sendable conformance are both on the same type is also not right yet.
* Fix unnecessary one-time recompile of stdlib with -enable-ossa-flag
This includes a bit in the module format to represent if the module was
compiled with -enable-ossa-modules flag. When compiling a client module
with -enable-ossa-modules flag, all dependent modules are checked for this bit,
if not on, recompilation is triggered with -enable-ossa-modules.
* Updated tests
Split up the expr list parsing members such that
there are separate entry points for tuple and
argument list parsing, and start using the argument
list parsing member for call and subscripts.
