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// RUN: %target-typecheck-verify-swift
// Test redeclaration checking in local context.
func test1() {
let x = 123 // expected-note{{'x' previously declared here}}
func f() {} // expected-note{{'f()' previously declared here}}
struct S {} // expected-note{{'S' previously declared here}}
let x = 321 // expected-error{{invalid redeclaration of 'x'}}
func f() {} // expected-error{{invalid redeclaration of 'f()'}}
struct S {} // expected-error{{invalid redeclaration of 'S'}}
}
func test2() {
let x = 123 // expected-warning {{never used}}
func f() {}
struct S {}
do {
let x = 321 // expected-warning {{never used}}
func f() {}
struct S {}
}
}
func test3<T, T>(_: T, _: T) {}
// expected-note@-1 {{'T' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'T'}}
// expected-error@-3 {{generic parameter 'T' is not used in function signature}}
func test4(x: Int, x: Int) {}
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
struct Test4<T, T> {}
// expected-note@-1 {{'T' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'T'}}
typealias Test5<T, T> = ()
// expected-note@-1 {{'T' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'T'}}
enum E {
case test6(x: Int, x: Int)
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
subscript(x: Int, x: Int) -> Int { return 0 }
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
}
_ = { (x: Int, x: Int) in }
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
enum MyError : Error {
case error(Int, Int)
}
func stmtTest() {
let n: (Int, Int)? = nil
if case (let x, let x)? = n {}
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
for case (let x, let x) in [(Int, Int)]() {}
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
switch n {
case (let x, let x)?: _ = ()
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
case nil: _ = ()
}
while case (let x, let x)? = n {}
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
guard case (let x, let x)? = n else {}
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
do {} catch MyError.error(let x, let x) {}
// expected-note@-1 {{'x' previously declared here}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
// expected-warning@-3 {{unreachable}}
}
func fullNameTest() {
let x = 123 // expected-warning {{never used}}
func x() {}
}
// For source compatibility, allow duplicate parameter labels on
// protocol requirements.
protocol SillyProtocol {
init(x: Int, x: Int)
init(a x: Int, b x: Int)
func foo(x: Int, x: Int)
func foo(a x: Int, b x: Int)
subscript(x: Int, x: Int) -> Int { get }
subscript(a x: Int, b x: Int) -> Int { get }
}
// https://github.com/apple/swift/issues/63750
let issue63750 = {
for (x,x) in [(0,0)] {}
// expected-error@-1 {{invalid redeclaration of 'x'}}
// expected-note@-2 {{'x' previously declared here}}
if case let (x,x) = (0,0) {}
// expected-error@-1 {{invalid redeclaration of 'x'}}
// expected-note@-2 {{'x' previously declared here}}
switch (0,0) {
case let (x,x):
// expected-error@-1 {{invalid redeclaration of 'x'}}
// expected-note@-2 {{'x' previously declared here}}
()
}
func bar(_ x: Int) -> Int { x }
if case (bar(let x), let x) = (0,0) {}
// expected-error@-1 {{'let' binding pattern cannot appear in an expression}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
// expected-note@-3 {{'x' previously declared here}}
}
func issue63750fn() {
// Make sure the behavior is consistent with the multi-statement closure case.
for (x,x) in [(0,0)] {}
// expected-error@-1 {{invalid redeclaration of 'x'}}
// expected-note@-2 {{'x' previously declared here}}
if case let (x,x) = (0,0) {} // expected-warning {{'if' condition is always true}}
// expected-error@-1 {{invalid redeclaration of 'x'}}
// expected-note@-2 {{'x' previously declared here}}
switch (0,0) {
case let (x,x):
// expected-error@-1 {{invalid redeclaration of 'x'}}
// expected-note@-2 {{'x' previously declared here}}
()
}
func bar(_ x: Int) -> Int { x }
if case (bar(let x), let x) = (0,0) {}
// expected-error@-1 {{'let' binding pattern cannot appear in an expression}}
// expected-error@-2 {{invalid redeclaration of 'x'}}
// expected-note@-3 {{'x' previously declared here}}
}
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