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03a6190a1f
Previously the "as" keyword could either represent coercion or or forced downcasting. This change separates the two notions. "as" now only means type conversion, while the new "as!" operator is used to perform forced downcasting. If a program uses "as" where "as!" is called for, we emit a diagnostic and fixit. Internally, this change removes the UnresolvedCheckedCastExpr class, in favor of directly instantiating CoerceExpr when parsing the "as" operator, and ForcedCheckedCastExpr when parsing the "as!" operator. Swift SVN r24253
17 lines
391 B
Swift
17 lines
391 B
Swift
// RUN: %target-run-simple-swift | FileCheck %s
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class B { func foo() { println("foo") } }
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class D : B { func bar() { println("bar") } }
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class G<T> : B { func bas() { println("bas") } }
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// CHECK: foo
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func up(d: D) { d.foo() }
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// CHECK: bar
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func down(b: B) { (b as! D).bar() }
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// CHECK: bas
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func down_generic(b: B) { (b as! G<Int>).bas() }
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up(D())
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down(D())
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down_generic(G<Int>())
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