[silgen] Teach SILGen how to emit a forced dynamic member ref given nonisolated(nonsending) casts. #82029
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…onisolated(nonsending) casts.
Specifically, I taught SILGen how to emit an AST like the following:
```
(force_value_expr implicit type="nonisolated(nonsending) (Date?) async -> Void" implicit_iuo_unwrap
(open_existential_expr implicit type="(nonisolated(nonsending) (Date?) async -> Void)?"
(opaque_value_expr implicit type="AnyObject")
(declref_expr type="AnyObject" decl="test.(file).repro()[email protected]:6:7" function_ref=unapplied)
(optional_evaluation_expr type="(nonisolated(nonsending) (Date?) async -> Void)?"
(inject_into_optional type="(nonisolated(nonsending) (Date?) async -> Void)?"
(function_conversion_expr type="nonisolated(nonsending) (Date?) async -> Void"
(bind_optional_expr type="(Date?) async -> Void" depth=0
(dynamic_member_ref_expr type="((Date?) async -> Void)?" decl="__ObjC.(file).Foo.start(at:)"
(opaque_value_expr type="AnyObject"))))))))
```
Since we are emitting an objc async function, there isn't an extra implicit
parameter like if we were using a swift async function. So, I just reused code
that was already used locally to look through these sorts of conversions. I
just had to add to that code support for conversions that add
nonisolated(nonsending). Previously it only supported looking through global
actor conversions.
rdar://152596823
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rjmccall
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Jun 5, 2025
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Specifically, I taught SILGen how to emit an AST like the following:
Since we are emitting an objc async function, there isn't an extra implicit parameter like if we were using a swift async function. So, I just reused code that was already used locally to look through these sorts of conversions. I just had to add to that code support for conversions that add nonisolated(nonsending). Previously it only supported looking through global actor conversions.
rdar://152596823