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// RUN: %target-typecheck-verify-swift
enum E {
case e1
case e2
}
func foo1(e : E) {
switch e { // expected-error{{switch must be exhaustive}}
// expected-note@-1 {{add missing case: '.e2'}}
case .e1: return
}
}
func foo2(i : Int) {
// expected-note@+1{{add a default clause}}{{+2:3-3=default:\n<#code#>\n}}
switch i { // expected-error{{switch must be exhaustive}}
case 1: return
}
}
// Treat nil as .none and do not emit false
// non-exhaustive warning.
func testSwitchEnumOptionalNil(_ x: Int?) -> Int {
switch x { // no warning
case .some(_):
return 1
case nil:
return -1
}
}
// Do not emit false non-exhaustive warnings if both
// true and false are covered by the switch.
func testSwitchEnumBool(_ b: Bool, xi: Int) -> Int {
var x = xi
let Cond = b
switch Cond { // no warning
default:
x += 1
}
switch Cond { // expected-error{{switch must be exhaustive}}
// expected-note@-1 {{missing case: 'false'}}
case true:
x += 1
}
switch Cond { // expected-error{{switch must be exhaustive}}
// expected-note@-1 {{missing case: 'true'}}
case false:
x += 1
}
switch Cond { // no warning
case true:
x += 1
case false:
x -= 1
}
return x
}
func testSwitchOptionalBool(_ b: Bool?, xi: Int) -> Int {
var x = xi
switch b { // No warning
case .some(true):
x += 1
case .some(false):
x += 1
case .none:
x -= 1
}
switch b { // expected-error{{switch must be exhaustive}}
// expected-note@-1 {{add missing case: '.some(false)'}}
case .some(true):
x += 1
case .none:
x -= 1
}
return xi
}
// Do not emit false non-exhaustive warnings if both
// true and false are covered for a boolean element of a tuple.
func testSwitchEnumBoolTuple(_ b1: Bool, b2: Bool, xi: Int) -> Int {
var x = xi
let Cond = (b1, b2)
switch Cond { // no warning
default:
x += 1
}
switch Cond { // expected-error{{switch must be exhaustive}}
// expected-note@-1 {{add missing case: '(false, _)'}}
// expected-note@-2 {{add missing case: '(_, false)'}}
case (true, true):
x += 1
}
switch Cond { // expected-error{{switch must be exhaustive}}
// expected-note@-1 {{add missing case: '(true, _)'}}
// expected-note@-2 {{add missing case: '(_, false)'}}
case (false, true):
x += 1
}
switch Cond { // no warning
case (true, true):
x += 1
case (true, false):
x += 1
case (false, true):
x -= 1
case (false, false):
x -= 1
}
return x
}
func non_fully_covered_switch(x: Int) -> Int {
var x = x
switch x { // expected-error{{switch must be exhaustive}}
// expected-note@-1{{add a default clause}}
case 0:
x += 1
case 3:
x -= 1
}
return x
}
// Do not crash if another switch statement follows a fallthrough.
func fallthrough_not_last(i: Int) {
switch i {
case 1:
fallthrough
switch i {
case 1: break
default: break
}
default:
break
}
}
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