Files
swift-mirror/validation-test/compiler_crashers/0196-swift-constraints-constraint-create.swift
Chris Lattner 20f8f09ea8 Land: <rdar://problem/19382905> improve 'if let' to support refutable patterns and untie it from optionals
This changes 'if let' conditions to take general refutable patterns, instead of
taking a irrefutable pattern and implicitly matching against an optional.

Where before you might have written:
  if let x = foo() {

you now need to write:
  if let x? = foo() {
    
The upshot of this is that you can write anything in an 'if let' that you can
write in a 'case let' in a switch statement, which is pretty general.

To aid with migration, this special cases certain really common patterns like
the above (and any other irrefutable cases, like "if let (a,b) = foo()", and
tells you where to insert the ?.  It also special cases type annotations like
"if let x : AnyObject = " since they are no longer allowed.

For transitional purposes, I have intentionally downgraded the most common
diagnostic into a warning instead of an error.  This means that you'll get:

t.swift:26:10: warning: condition requires a refutable pattern match; did you mean to match an optional?
if let a = f() {
       ^
        ?

I think this is important to stage in, because this is a pretty significant
source breaking change and not everyone internally may want to deal with it
at the same time.  I filed 20166013 to remember to upgrade this to an error.

In addition to being a nice user feature, this is a nice cleanup of the guts
of the compiler, since it eliminates the "isConditional()" bit from
PatternBindingDecl, along with the special case logic in the compiler to handle
it (which variously added and removed Optional around these things).




Swift SVN r26150
2015-03-15 07:06:22 +00:00

696 lines
9.5 KiB
Swift

// RUN: not --crash %target-swift-frontend %s -parse
// XFAIL: no_asserts
// Distributed under the terms of the MIT license
// Test case submitted to project by https://github.com/practicalswift (practicalswift)
// Test case found by fuzzing
protocol a {
}
protocol b : a {
}
protocol c : a {
}
protocol d {
typealias f = a
}
struct e : d {
typealias f = b
}
func i<j : b, k : d where k.f == j> (n: k) {
}
func i<l : d where l.f == c> (n: l) {
}
i(e())
func prefi(with: String-> <T>() -> T)t
func d() -> String {
return 1
k f {
typealias c
}
class g<i{
}
d(j i)
class h {
typealias i = i
}
struct l<e : SequenceType> {
l g: e
}
func h<e>() -> [l<e>] {
f []
}
func i(e: g) -> <j>(() -> j) -> k
a)
func a<b:a
func b<e>(e : e) -> c { e
class j {
func y((Any, j))(v: (Any, AnyObject)) {
y(v)
}
}
func w(j: () -> ()) {
}
class v {
l _ = w() {
}
}
({})
func v<x>() -> (x, x -> x) -> x {
l y j s<q : l, y: l m y.n == q.n> {
}
o l {
u n
}
y q<x> {
s w(x, () -> ())
}
o n {
func j() p
}
class r {
func s() -> p {
t ""
}
}
class w: r, n {
k v: ))] = []
}
class n<x : n>
class A: A {
}
class B : C {
}
typealias C = B
protocol f {
k g d {
k d
k k
}
j j<l : d> : d {
k , d>
}
class f: f {
}
class B : l {
}
k l = B
class f<i : f
class i<h>: c {
var g: h
init(g: h) {
self.g = g
e{
j d>
}
class f {
typealias e = e
protocol A {
typealias B
}
class C<D> {
init <A: A where A.B == D>(e: A.B) {
}
}
func p<p>() -> (p, p -> p) -> p {
l c l.l = {
}
{
p) {
(e: o, h:o) -> e
})
}
j(k(m, k(2, 3)))
func l(p: j) -> <n>(() -> n
func f(k: Any, j: Any) -> (((Any, Any) -> Any) -> c
k)
func c<i>() -> (i, i -> i) -> i {
k b k.i = {
}
{
i) {
k }
}
protocol c {
class func i()
}
class k: c{ class func i {
a=1 as a=1
func d<b: SequenceType, e where Optional<e> == b.Generator.Element>(c : b) -> e? {
for (mx : e?) in c {
func a<T>() -> (T, T -> T) -> T {
var b: ({ (x: Int, f: Int -> Int) -> Int in
return f(x)
}(x1, f1)
let crashes: Int = { x, f in
return f(x)
}(x1ny) -> Any) -> Anyh>, d>
}
class A<T : A> {
}
func i(c: () -> ()) {
}
class a {
var _ = i() {
}
}
f
e)
func f<g>() -> (g, g -> g) -> g {
d j d.i = {
}
{
g) {
h }
}
pss d: f{ class func i {}
}
class f<p : k, p : k n p.d> : o {
}
class f<p, p> {
}
protocol k {
e o
}
protocol o {
class func k(dynamicType.k()
f j = i
f l: k -> k = {
m
}(j, l)
f
protocol k : f { func f
struct c<d: SequenceType, b where Optional<b> == d.Generator.Element>
protocol A {
typealias E
}
struct B<T : A> {
let h: T
let i: T.E
}
protocol C {
typealias F
func g<T where T.E == F>(f: B<T>)
}
struct D : C {
typealias F = Int
func g<T where T.E == F>(f: B<T>) {
}
}
class k {
func l((Any, k))(m }
}
func j<f: l: e -> e = {
{
l) {
m }
}
protocol k {
class func j()
}
class e: k{ class func j
func b(c) -> <d>(() -> d)
protocol A {
func c() -> String
}
class B {
func e<T where T: A, T: B>(t: T) {
t.c()
}
func prefix(with: String) -> <T>(() -> T) -> String {
return { g in "\(with): \(g())" }
}
protocol A {
typealias B ret
}
struct C<D, E: A where D.C == E> {
}
struct A<T> {
let a, () -> ())] = []
}
enum S<T> {
case C(T, () -> ())
}
struct A<T> {
let a: [(T, () -> ())d : SequenceTy
return []
}
func prefix(with: String) -> <T>(() -> T) - t.c()
}
struct c<d : SequenceType> {
var b: d
}
func a<d>() -> [c<d>] {
return []
}
func e<k>() -> (k, k -> k) -> k {
f j f.i = {
}
{
k) {
n }
}
m e {
class func i()
}
class f: e{ class func i {}
func n<i>() {
k k {
f j
}
}
func n(k: Int = l) {
}
let j = n
func ^(a: BooleanType, Bool) -> Bool {
return !(a)
}
protocol a {
class func c()
class b: a {
class func c() { }
}
(b() as a).dynamicType.c()
b
protocol c : b { func b
func some<S: SequenceType, T where Optional<T> == S.Generator.Element>(xs : S) -> T? {
for (mx : if let x? = mx {
d: f{ ceanTy b {
clasi() {
}
}
protocol a {
class func c()
}
class b: a {
class func c() { }
}
(b() as a).dynamicType.c()
struct A<T> {
let a: [(T, () -> ())] = []
}
f> {
c(d ())
}
func b(e)-> <d>(() -> d)
b
protocol c : b { func b
protocol a {
}
protocol h : a {
}
protocol k : a {
}
protocol g {
j n = a
}
struct n : g {
j n = h
}
func i<h : h, f : g m f.n == h> (g: f) {
}
func i<n : g m n.n = o) {
}
let k = a
k()
h
protocol k : h { func h
k
func a(x: Any, y: Any) -> (((Any, Any) -> Any) -> Any) {
return {
(m: (Any, Any) -> Any) -> Any in
return m(x, y)
}
}
func b(z: (((Any, Any) -> Any) -> Any)) -> Any {
return z({
(p: Any, q:Any) -> Any in
return p
})
}
b(a(1, a(2, 3)))
d = i
}
class d<j : i, f : i where j.i == f> : e {
}
class d<j, f> {
}
protocol i {
typealias i
}
protocol e {
class func i()
}
i
(d() as e).j.i()
d
protocol i : d { func d
f b<g f:
func f<g {
enum f {
func f
var _ = f
}
func a<g>() -> (g, g -> g) -> g {
var b: ((g, g -> g) -> g)!
return b
}
func f<g : d {
return !(a)
enum g {
func g
var _ = g
func b<d {
enum b { func c
var _ = c
func f() {
({})
}
func f<T : BooleanType>(b: T) {
}
f(true as BooleanType)
func a<T>() -> (T, T -> T) -> T {
var4, nil]
println(some(xs))
protocol A {
t class func i()
}
class d: f{ class func i {}
var x1 = 1
var f1: Int -> Int tInt -> Int) -> Int in
return f>] {
return []
}
func i(c: () -> ()) {
}
class a {
var _ = i() {
}
}
struct A<T> {
let a: [(T, () -> ())] = [namicType.c()
func a(b: Int = 0) {
}
let c = a
c()
class a {
typealias b = b
}
({})
import Foundation
class m<j>k i<g : g, e : f k(f: l) {
}
i(())
class h {
typealias g = g
func b<d-> d { class d:b class b
func f<e>() -> (e, e -> e) -> e {
e b e.c = {
}
{
e) {
f }
}
protocol f {
class func c()
}
class e: f{ class func c
protocol a {
class func c()
}
class b: a {
c T) {
}
f(true as BooleanType)
func f() {
({})
}
import Foundation
class Foo<T>: 1)
func c<d {
enum c {
func e
var _ = e
}
}
struct c<d : SequenceType> {
var b: d
}
func a<d>() -> [c<d>] {
return []
}
a=1 as a=1
func some<S: SequenceType, T where Optional<T> return !(a)
}
({})
func prefix(with: String) -> <T>(() -> T) -> String { func b
clanType, Bool) -> Bool {
)
}
strs d
typealias b> : b {
typealias d = h
typealias e = a<c<h>, d>
}
protocol A {
typealias B
}
class C<D> {
init <A: A where A.B == D>(e: A.B) {
}
}
func a() as a).dynamicType.c()
func prefix(with: String) -> <T>(() -> T) -> String {
return { g in "\(with): \(g())" }
}
struct d<f : e, g: e where g.h == f.h> {
}
protocol e {
typealias h
}
protocol a : a {
}
func a<T>() -> (T, T -> T) -> T)!c : b { func b
var f = 1
var e: Int -> Int = {
return $0
}
let d: Int = { c, b in
}(f, e)
func f<T : BooleanType>(b: T) {
}
f(true as BooleanType)
i)
import Foundation
class q<k>: NSObject {
var j: k
e ^(l: m, h) -> h {
f !(l)
}
protocol l {
d g n()
}
class h: l {
class g n() { }
}
(h() o l).p.n()
class l<n : h,
d> Bool {
e !(f)
}
b
protocol f : b { func b
protocol A {
typealias B
func b(B)
}
struct X<Y> : A {
func b(b: X.Type) {
}
}
protocol b {
class func e()
}
struct c {
var d: b.Type
func e() {
d.e()
}
}
d ""
e}
class d {
func b((Any, d)typealias b = b
[]
}
protocol p {
}
protocol g : p {
}
n j }
}
protocol k {
class func q()
}
class n: k{ class func q {}
func r<e: t, s where j<s> == e.m { func g
k q<n : t> {
q g: n
}
func p<n>() -> [q<n>] {
o : g.l) {
}
}
class p {
typealias g = g
protocol A {
func c() -> String
}
class B {
func d() -> String {
return ""
}
}
class C: B, A {
override func d() -> String {
return ""
}
func c() -> String {
return ""
}
}
func e<T where T: A, T: B>(t: T) {
t.c()
}
protocol l : p {
}
protocol m {
j f = p
}
f m : m {
j f = o
}
func i<o : o, m : m n m.f == o> (l: m) {
}
k: m
}
func p<m>() -> [l<m>] {
return []
}
f
m)
func f<o>() -> (o, o -> o) -> o {
m o m.i = {
}
{
o) {
p }
}
protocol f {
class func i()
}
class mo : m, o : p o o.m == o> (m: o) {
}
func s<v : p o v.m == m> (u: String) -> <t>(() -> t) -
>)
}
struct n : C {
class p {
typealias n = n
}
l
l)
func l<u>() -> (u, u -> u) -> u {
n j n.q = {
}
{
u) {
h }
}
protocol l {
class {
func n() -> q {
return ""
}
}
class C: s, l {
t) {
return {
(s: (t, t) -> t) -> t o
return s(c, u)
}
}
func n(r: (((t, t) -> t) -> t)) -> t {
return r({
return k
})
class a<f : b, g : b where f.d == g> {
}
protocol b {
typealias d
typealias e
}
struct c<h : b> : b {
typealias d = h
typealias e = a<c<h>, d>
}
w
class x<u>: d {
l i: u
init(i: u) {
o.i = j {
r { w s "\(f): \(w())" }
}
protocol h {
q k {
t w
}
w
protocol k : w { func v <h: h m h.p == k>(l: h.p) {
}
}
protocol h {
n func w(w:
}
class h<u : h> {
o
}
class f<p : k, p : k where p.n == p> : n {
}
class f<p, p> {
}
protocol k {
typealias n
}
o: i where k.j == f> {l func k() { }
}
(f() as n).m.k()
func k<o {
enum k {
func o
var _ = o
() {
g g h g
}
}
func e(i: d) -> <f>(() -> f)>
q
var m: Int -> Int = {
n $0
o: Int = { d, l f
n l(d)
}(k, m)
protocol j {
typealias d
typealias n = d
typealias l = d}
class g<q : l, m : l p q.g == m> : j {
}
class g<q, m> {
}
protocol l {
typealias g