[ConstraintSystem] Detect and diagnoses use of members with mutating getters in key path #24097
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…a key path component Such use is currently not allowed so variables or subscripts with mutating getters should be rejected and diagnosed.
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xedin
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Apr 18, 2019
…getters in key path
Such use is currently not allowed so variables or subscripts with
mutating getters should be rejected and diagnosed.
```swift
struct S {
var foo: Int {
mutating get { return 42 }
}
subscript(_: Int) -> Bool {
mutating get { return false }
}
}
_ = \S.foo
_ = \S.[0]
```
Resolves: rdar://problem/49413561
(PR swiftlang#24097)
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Such use is currently not allowed so variables or subscripts with
mutating getters should be rejected and diagnosed.
Resolves: rdar://problem/49413561