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// RUN: %target-swift-frontend -typecheck -disable-availability-checking -enable-experimental-async-top-level -swift-version 5 %s -verify
// enable-experimental-async-top-level is passed and an await is used in the
// top-level, so the top-level code is a concurrent context. Variables are
// declared with `@_predatesConcurrency @MainActor`, and the top-level is run on
// the main actor.
var a = 10 // expected-note {{mutation of this var is only permitted within the actor}}
func nonIsolatedSync() {
// Okay because `a` is '@_predatesConcurrency'
print(a)
a = a + 10
}
@MainActor
func isolatedSync() {
print(a)
a = a + 10
}
func nonIsolatedAsync() async {
await print(a)
a = a + 10
// expected-warning@-1:5 {{main actor-isolated var 'a' can not be mutated from a nonisolated context}}
// expected-warning@-2:9 {{expression is 'async' but is not marked with 'await'}}{{9-9=await }}
// expected-note@-3:9 {{property access is 'async'}}
}
@MainActor
func isolatedAsync() async {
print(a)
a = a + 10
}
nonIsolatedSync()
isolatedSync()
await nonIsolatedAsync()
await isolatedAsync()
print(a)
if a > 10 {
nonIsolatedSync()
isolatedSync()
await nonIsolatedAsync()
await isolatedAsync()
print(a)
}
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