File: where_clause.swift

package info (click to toggle)
swiftlang 6.1.3-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,791,532 kB
  • sloc: cpp: 9,901,743; ansic: 2,201,431; asm: 1,091,827; python: 308,252; objc: 82,166; f90: 80,126; lisp: 38,358; pascal: 25,559; sh: 20,429; ml: 5,058; perl: 4,745; makefile: 4,484; awk: 3,535; javascript: 3,018; xml: 918; fortran: 664; cs: 573; ruby: 396
file content (32 lines) | stat: -rw-r--r-- 907 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
// RUN: %target-typecheck-verify-swift

// rdar://problem/31401161
class C1 {}

protocol P1 {
  associatedtype Element
}

protocol P2 : P1 {
  associatedtype SubSequence : P1 // expected-note{{'SubSequence' declared here}}
}

protocol P3 : P2 {
  associatedtype SubSequence : P2 // expected-warning{{redeclaration of associated type 'SubSequence' from protocol 'P2' is better expressed as a 'where' clause on the protocol}}
}

func foo<S>(_: S) where S.SubSequence.Element == C1, S : P3 {}

protocol SelfWhereClause where Self: AnyObject {}

func takesAnyObject<T : AnyObject>(_: T) {}
func takesSelfWhereClause<T : SelfWhereClause>(_ t: T) {
  takesAnyObject(t)
}

class AlsoBad {}

protocol InvalidWhereClause2 {
  associatedtype T where Self: AlsoBad
  // expected-error@-1 {{constraint with subject type of 'Self' is not supported; consider adding requirement to protocol inheritance clause instead}}
}