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a40f1abaff
Introduce SingleValueStmtExpr, which allows the embedding of a statement in an expression context. This then allows us to parse and type-check `if` and `switch` statements as expressions, gated behind the `IfSwitchExpression` experimental feature for now. In the future, SingleValueStmtExpr could also be used for e.g `do` expressions. For now, only single expression branches are supported for producing a value from an `if`/`switch` expression, and each branch is type-checked independently. A multi-statement branch may only appear if it ends with a `throw`, and it may not `break`, `continue`, or `return`. The placement of `if`/`switch` expressions is also currently limited by a syntactic use diagnostic. Currently they're only allowed in bindings, assignments, throws, and returns. But this could be lifted in the future if desired.
48 lines
922 B
Swift
48 lines
922 B
Swift
// RUN: %target-typecheck-verify-swift %clang-importer-sdk
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// REQUIRES: objc_interop
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import Foundation
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func testReturn1(_ d: Double) -> CGFloat {
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if .random() { d } else { 0 }
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}
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func testReturn2(_ d: Double) -> CGFloat {
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return if .random() { d } else { 0 }
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}
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func testReturn3(_ d: Double) -> CGFloat {
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switch Bool.random() { case true: d case false: 0.0 }
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}
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func testClosure(_ d: CGFloat) {
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func fn(_: () -> Double) {}
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fn {
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if .random() { d } else { 0.0 }
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}
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fn {
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if .random() { 0 } else { d }
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}
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fn {
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if .random() { d } else { d }
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}
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fn {
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return if .random() { d } else { d }
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}
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fn {
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switch Bool.random() {
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case true:
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d
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case false:
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0.0
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}
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}
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}
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func testAssignment(_ d: CGFloat) -> Double {
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let d1: Double = if .random() { d } else { 0.0 }
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let d2: Double = switch Bool.random() { case true: d case false: 0.0 }
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return .random() ? d1 : d2
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}
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