[SwiftParser] Implement nonisolated(nonsending) specifier
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…ng` argument This is part of SE-0461 proposal where `nonisolated` has to be marked as `nonsending` in type context to indicate that the function type it's attached to is caller isolated.
…suming '('
It's possible that `(nonsending)` was omitted and instead we are
at the parameter list of a function type. Checking ahead allows
for a better diagnostics and recovery.
…s with arguments
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swiftlang/swift#80668 |
| diagnostics: [ | ||
| DiagnosticSpec( | ||
| message: "expected identifier in modifier", | ||
| fixIts: ["replace 'sending' with identifier"] |
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Hmm, this error message isn’t great. I would prefer if we just accept any identifier here in the parser and let ASTGen diagnose unknown identifiers as the detail.
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Something to consider here before we make a final decision: if we did allow any and all identifiers here, it would mean that we'd always parse nonisolated as a declaration modifier, which is a break from what C++ parser is doing and is not always correct.
Consider this situation:
func nonisolated() {
}
let v: Int = 42
nonisolated(v)
func test() -> Int { 42 }
This is currently a call + a decl but it would be interpreted as a a decl with a modifier with this change.
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OK, let’s just stick with the current solution. It’s not the best but maybe good enough for now. And I don’t want to block this PR on improving this.
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swiftlang/swift#80668 |
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swiftlang/swift#80668 |
…odifiers while skipping Otherwise in situations like `nonisolated()` `canParseType` would return `true` because `()` is valid type.
…ing` in expression context
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swiftlang/swift#80668 |
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swiftlang/swift#80668 |
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swiftlang/swift#80668 |
This is part of SE-0461 proposal where
nonisolatedhas to bemarked as
nonsendingin type context to indicate that thefunction type it's attached to is caller isolated.