{broken + `x5; func _() { var x map[string][...]int; x = map[string][...]int{"": {1,2,3}} }`, `x`, `map[string][-1]int`},
// parameterized functions
- {genericPkg + `p0; func f[T any](T); var _ = f[int]`, `f`, `func[generic_p0.T₁ interface{}](generic_p0.T₁)`},
- {genericPkg + `p1; func f[T any](T); var _ = f[int]`, `f[int]`, `func(int)`},
- {genericPkg + `p2; func f[T any](T); func _() { f(42) }`, `f`, `func[generic_p2.T₁ interface{}](generic_p2.T₁)`},
- {genericPkg + `p3; func f[T any](T); func _() { f(42) }`, `f(42)`, `()`},
+ {genericPkg + `p0; func f[T any](T) {}; var _ = f[int]`, `f`, `func[generic_p0.T₁ interface{}](generic_p0.T₁)`},
+ {genericPkg + `p1; func f[T any](T) {}; var _ = f[int]`, `f[int]`, `func(int)`},
+ {genericPkg + `p2; func f[T any](T) {}; func _() { f(42) }`, `f`, `func[generic_p2.T₁ interface{}](generic_p2.T₁)`},
+ {genericPkg + `p3; func f[T any](T) {}; func _() { f(42) }`, `f(42)`, `()`},
// type parameters
{genericPkg + `t0; type t[] int; var _ t`, `t`, `generic_t0.t`}, // t[] is a syntax error that is ignored in this test in favor of t
targs []string
sig string
}{
- {genericPkg + `p0; func f[T any](T); func _() { f(42) }`,
+ {genericPkg + `p0; func f[T any](T) {}; func _() { f(42) }`,
`f`,
[]string{`int`},
`func(int)`,
},
- {genericPkg + `p1; func f[T any](T) T; func _() { f('@') }`,
+ {genericPkg + `p1; func f[T any](T) T { panic(0) }; func _() { f('@') }`,
`f`,
[]string{`rune`},
`func(rune) rune`,
},
- {genericPkg + `p2; func f[T any](...T) T; func _() { f(0i) }`,
+ {genericPkg + `p2; func f[T any](...T) T { panic(0) }; func _() { f(0i) }`,
`f`,
[]string{`complex128`},
`func(...complex128) complex128`,
},
- {genericPkg + `p3; func f[A, B, C any](A, *B, []C); func _() { f(1.2, new(string), []byte{}) }`,
+ {genericPkg + `p3; func f[A, B, C any](A, *B, []C) {}; func _() { f(1.2, new(string), []byte{}) }`,
`f`,
[]string{`float64`, `string`, `byte`},
`func(float64, *string, []byte)`,
},
- {genericPkg + `p4; func f[A, B any](A, *B, ...[]B); func _() { f(1.2, new(byte)) }`,
+ {genericPkg + `p4; func f[A, B any](A, *B, ...[]B) {}; func _() { f(1.2, new(byte)) }`,
`f`,
[]string{`float64`, `byte`},
`func(float64, *byte, ...[]byte)`,
},
- {genericPkg + `s1; func f[T any, P interface{~*T}](x T); func _(x string) { f(x) }`,
+ {genericPkg + `s1; func f[T any, P interface{~*T}](x T) {}; func _(x string) { f(x) }`,
`f`,
[]string{`string`, `*string`},
`func(x string)`,
},
- {genericPkg + `s2; func f[T any, P interface{~*T}](x []T); func _(x []int) { f(x) }`,
+ {genericPkg + `s2; func f[T any, P interface{~*T}](x []T) {}; func _(x []int) { f(x) }`,
`f`,
[]string{`int`, `*int`},
`func(x []int)`,
},
- {genericPkg + `s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T); func _(x []int) { f(x) }`,
+ {genericPkg + `s3; type C[T any] interface{~chan<- T}; func f[T any, P C[T]](x []T) {}; func _(x []int) { f(x) }`,
`f`,
[]string{`int`, `chan<- int`},
`func(x []int)`,
},
- {genericPkg + `s4; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]](x []T); func _(x []int) { f(x) }`,
+ {genericPkg + `s4; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]](x []T) {}; func _(x []int) { f(x) }`,
`f`,
[]string{`int`, `chan<- int`, `chan<- []*chan<- int`},
`func(x []int)`,
},
- {genericPkg + `t1; func f[T any, P interface{~*T}]() T; func _() { _ = f[string] }`,
+ {genericPkg + `t1; func f[T any, P interface{~*T}]() T { panic(0) }; func _() { _ = f[string] }`,
`f`,
[]string{`string`, `*string`},
`func() string`,
},
- {genericPkg + `t2; type C[T any] interface{~chan<- T}; func f[T any, P C[T]]() []T; func _() { _ = f[int] }`,
+ {genericPkg + `t2; type C[T any] interface{~chan<- T}; func f[T any, P C[T]]() []T { return nil }; func _() { _ = f[int] }`,
`f`,
[]string{`int`, `chan<- int`},
`func() []int`,
},
- {genericPkg + `t3; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T; func _() { _ = f[int] }`,
+ {genericPkg + `t3; type C[T any] interface{~chan<- T}; func f[T any, P C[T], Q C[[]*P]]() []T { return nil }; func _() { _ = f[int] }`,
`f`,
[]string{`int`, `chan<- int`, `chan<- []*chan<- int`},
`func() []int`,
check.funcType(sig, fdecl.Recv, fdecl.Type)
obj.color_ = saved
+ if fdecl.Type.TParams.NumFields() > 0 && fdecl.Body == nil {
+ check.softErrorf(fdecl.Name, _Todo, "parameterized function is missing function body")
+ }
+
// function body must be type-checked after global declarations
// (functions implemented elsewhere have no body)
if !check.conf.IgnoreFuncBodies && fdecl.Body != nil {
x.m /* ERROR x\.m undefined */ ()
}
-// In a generic function body all method calls will be pointer method calls.
-// If necessary, the function body will insert temporary variables, not seen
-// by the user, in order to get an addressable variable to use to call the method.
-// Thus, assume an argument type for a generic function to be the type of addressable
-// values in the generic function when checking if the argument type satisfies the
-// generic function's type bound.
-func f2[_ interface{ m1(); m2() }]()
+func f2[_ interface{ m1(); m2() }]() {}
type T struct{}
func (T) m1()
type sliceOf[E any] interface{ ~[]E }
-func append[T interface{}, S sliceOf[T], T2 interface{}](s S, t ...T2) S
+func append[T interface{}, S sliceOf[T], T2 interface{}](s S, t ...T2) S { panic(0) }
var f func()
var cancelSlice []context.CancelFunc
// A generic function must be instantiated with a type, not a value.
-func g[T any](T) T
+func g[T any](T) T { panic(0) }
var _ = g[int]
var _ = g[nil /* ERROR is not a type */ ]
// chans
-func chans_Ranger[T any]() (*chans_Sender[T], *chans_Receiver[T])
+func chans_Ranger[T any]() (*chans_Sender[T], *chans_Receiver[T]) { panic(0) }
// A sender is used to send values to a Receiver.
type chans_Sender[T any] struct {
func (r *chans_Receiver[T]) Next() (T, bool) {
v, ok := <-r.values
return v, ok
-}
\ No newline at end of file
+}
// f1(int(0), int(0))
// }
-func f2[A any, B interface{~[]A}](A, B)
+func f2[A any, B interface{~[]A}](A, B) {}
func _() {
f := f2[byte]
f(byte(0), []byte{})
// f3(x, &x, &x)
// }
-func f4[A any, B interface{~[]C}, C interface{~*A}](A, B, C)
+func f4[A any, B interface{~[]C}, C interface{~*A}](A, B, C) {}
func _() {
f := f4[int]
var x int
f4(x, []*int{}, &x)
}
-func f5[A interface{~struct{b B; c C}}, B any, C interface{~*B}](x B) A
+func f5[A interface{~struct{b B; c C}}, B any, C interface{~*B}](x B) A { panic(0) }
func _() {
x := f5(1.2)
var _ float64 = x.b
var _ float64 = *x.c
}
-func f6[A any, B interface{~struct{f []A}}](B) A
+func f6[A any, B interface{~struct{f []A}}](B) A { panic(0) }
func _() {
x := f6(struct{f []string}{})
var _ string = x
Abs() T
}
-func AbsDifference[T NumericAbs[T]](x T)
+func AbsDifference[T NumericAbs[T]](x T) { panic(0) }
type OrderedAbs[T any] T
// same code, reduced to essence
-func g[P interface{ m() P }](x P)
+func g[P interface{ m() P }](x P) { panic(0) }
type T4[P any] P
E0
}
-func f0[T I0]()
+func f0[T I0]() {}
var _ = f0[int]
var _ = f0[bool]
var _ = f0[string]
E1
}
-func f01[T I01]()
+func f01[T I01]() {}
var _ = f01[int]
var _ = f01[bool /* ERROR does not satisfy I0 */ ]
var _ = f01[string]
E2
}
-func f012[T I012]()
+func f012[T I012]() {}
var _ = f012[int /* ERROR does not satisfy I012 */ ]
var _ = f012[bool /* ERROR does not satisfy I012 */ ]
var _ = f012[string /* ERROR does not satisfy I012 */ ]
E2
}
-func f12[T I12]()
+func f12[T I12]() {}
var _ = f12[int /* ERROR does not satisfy I12 */ ]
var _ = f12[bool /* ERROR does not satisfy I12 */ ]
var _ = f12[string /* ERROR does not satisfy I12 */ ]
~int
}
-func f0_[T I0_]()
+func f0_[T I0_]() {}
var _ = f0_[int]
var _ = f0_[bool /* ERROR does not satisfy I0_ */ ]
var _ = f0_[string /* ERROR does not satisfy I0_ */ ]
func identity[T any](x T) T { return x }
-func _[_ any](x int) int
-func _[T any](T /* ERROR redeclared */ T)()
-func _[T, T /* ERROR redeclared */ any]()
+func _[_ any](x int) int { panic(0) }
+func _[T any](T /* ERROR redeclared */ T)() {}
+func _[T, T /* ERROR redeclared */ any]() {}
// Constraints (incl. any) may be parenthesized.
func _[_ (any)]() {}
var _ = new /* ERROR cannot use generic function new */
var _ *int = new[int]()
-func _[T any](map[T /* ERROR incomparable map key type T \(missing comparable constraint\) */]int) // w/o constraint we don't know if T is comparable
+func _[T any](map[T /* ERROR incomparable map key type T \(missing comparable constraint\) */]int) {} // w/o constraint we don't know if T is comparable
-func f1[T1 any](struct{T1 /* ERROR cannot be a .* type parameter */ }) int
+func f1[T1 any](struct{T1 /* ERROR cannot be a .* type parameter */ }) int { panic(0) }
var _ = f1[int](struct{T1}{})
type T1 = int
-func f2[t1 any](struct{t1 /* ERROR cannot be a .* type parameter */ ; x float32}) int
+func f2[t1 any](struct{t1 /* ERROR cannot be a .* type parameter */ ; x float32}) int { panic(0) }
var _ = f2[t1](struct{t1; x float32}{})
type t1 = int
-func f3[A, B, C any](A, struct{x B}, func(A, struct{x B}, *C)) int
+func f3[A, B, C any](A, struct{x B}, func(A, struct{x B}, *C)) int { panic(0) }
var _ = f3[int, rune, bool](1, struct{x rune}{}, nil)
var _ = new /* ERROR cannot infer T */ ()
-func f4[A, B, C any](A, B) C
+func f4[A, B, C any](A, B) C { panic(0) }
var _ = f4 /* ERROR cannot infer C */ (1, 2)
var _ = f4[int, float32, complex128](1, 2)
-func f5[A, B, C any](A, []*B, struct{f []C}) int
+func f5[A, B, C any](A, []*B, struct{f []C}) int { panic(0) }
var _ = f5[int, float32, complex128](0, nil, struct{f []complex128}{})
var _ = f5 /* ERROR cannot infer */ (0, nil, struct{f []complex128}{})
var _ = f5(0, []*float32{new[float32]()}, struct{f []complex128}{})
-func f6[A any](A, []A) int
+func f6[A any](A, []A) int { panic(0) }
var _ = f6(0, nil)
-func f6nil[A any](A) int
+func f6nil[A any](A) int { panic(0) }
var _ = f6nil /* ERROR cannot infer */ (nil)
// type inference with variadic functions
-func f7[T any](...T) T
+func f7[T any](...T) T { panic(0) }
var _ int = f7 /* ERROR cannot infer T */ ()
var _ int = f7(1)
var _ = f7(1, 2.3 /* ERROR does not match */ )
var _ = f7(1.2, 3 /* ERROR does not match */ )
-func f8[A, B any](A, B, ...B) int
+func f8[A, B any](A, B, ...B) int { panic(0) }
var _ = f8(1) /* ERROR not enough arguments */
var _ = f8(1, 2.3)
type S1[P any] struct { f P }
-func f9[P any](x S1[P])
+func f9[P any](x S1[P]) {}
func _() {
f9[int](S1[int]{42})
type S2[A, B, C any] struct{}
-func f10[X, Y, Z any](a S2[X, int, Z], b S2[X, Y, bool])
+func f10[X, Y, Z any](a S2[X, int, Z], b S2[X, Y, bool]) {}
func _[P any]() {
f10[int, float32, string](S2[int, int, string]{}, S2[int, float32, bool]{})
// corner case for type inference
// (was bug: after instanting f11, the type-checker didn't mark f11 as non-generic)
-func f11[T any]()
+func f11[T any]() {}
func _() {
f11[int]()
// the previous example was extracted from
-func f12[T interface{m() T}]()
+func f12[T interface{m() T}]() {}
type A[T any] T
type R0 struct{}
-func (R0) _[ /* ERROR methods cannot have type parameters */ T any](x T)
-func (R0 /* ERROR invalid receiver */ ) _[ /* ERROR methods cannot have type parameters */ R0 any]() // scope of type parameters starts at "func"
+func (R0) _[ /* ERROR methods cannot have type parameters */ T any](x T) {}
+func (R0 /* ERROR invalid receiver */ ) _[ /* ERROR methods cannot have type parameters */ R0 any]() {} // scope of type parameters starts at "func"
type R1[A, B any] struct{}
func (_ R1[A, B]) m0(A, B)
-func (_ R1[A, B]) m1[ /* ERROR methods cannot have type parameters */ T any](A, B, T) T
+func (_ R1[A, B]) m1[ /* ERROR methods cannot have type parameters */ T any](A, B, T) T { panic(0) }
func (_ R1 /* ERROR not a generic type */ [R1, _]) _()
-func (_ R1[A, B]) _[ /* ERROR methods cannot have type parameters */ A /* ERROR redeclared */ any](B)
+func (_ R1[A, B]) _[ /* ERROR methods cannot have type parameters */ A /* ERROR redeclared */ any](B) {}
func _() {
var r R1[int, string]
// Type inference works in a straight-forward manner even
// for variadic functions.
-func variadic[A, B any](A, B, ...B) int
+func variadic[A, B any](A, B, ...B) int { panic(0) }
// var _ = variadic(1) // ERROR not enough arguments
var _ = variadic(1, 2.3)
// Thus even if a type can be inferred successfully, the function
// call may not be valid.
-func fboth[T any](chan T)
-func frecv[T any](<-chan T)
-func fsend[T any](chan<- T)
+func fboth[T any](chan T) {}
+func frecv[T any](<-chan T) {}
+func fsend[T any](chan<- T) {}
func _() {
var both chan int
fsend(send)
}
-func ffboth[T any](func(chan T))
-func ffrecv[T any](func(<-chan T))
-func ffsend[T any](func(chan<- T))
+func ffboth[T any](func(chan T)) {}
+func ffrecv[T any](func(<-chan T)) {}
+func ffsend[T any](func(chan<- T)) {}
func _() {
var both func(chan int)
// assignment is permitted, parameter passing is permitted as well,
// so type inference should be able to handle these cases well.
-func g1[T any]([]T)
-func g2[T any]([]T, T)
-func g3[T any](*T, ...T)
+func g1[T any]([]T) {}
+func g2[T any]([]T, T) {}
+func g3[T any](*T, ...T) {}
func _() {
type intSlize []int
// Here's a realistic example.
-func append[T any](s []T, t ...T) []T
+func append[T any](s []T, t ...T) []T { panic(0) }
func _() {
var f func()
// (that would indicate a slice type). Thus, generic functions cannot
// have empty type parameter lists, either. This is a syntax error.
-func h[] /* ERROR empty type parameter list */ ()
+func h[] /* ERROR empty type parameter list */ () {}
func _() {
h /* ERROR cannot index */ [] /* ERROR operand */ ()
}
+
+// Parameterized functions must have a function body.
+
+func _ /* ERROR missing function body */ [P any]()
~int|~float64|~string
}
-func min[T Ordered](x, y T) T
+func min[T Ordered](x, y T) T { panic(0) }
func _() {
// min can be called with explicit instantiation.
_ = min("foo", "bar")
}
-func mixed[T1, T2, T3 any](T1, T2, T3)
+func mixed[T1, T2, T3 any](T1, T2, T3) {}
func _() {
// mixed can be called with explicit instantiation.
mixed[int, string](1.1 /* ERROR cannot use 1.1 */ , "", false)
}
-func related1[Slice interface{~[]Elem}, Elem any](s Slice, e Elem)
+func related1[Slice interface{~[]Elem}, Elem any](s Slice, e Elem) {}
func _() {
// related1 can be called with explicit instantiation.
related1(si, "foo" /* ERROR cannot use "foo" */ )
}
-func related2[Elem any, Slice interface{~[]Elem}](e Elem, s Slice)
+func related2[Elem any, Slice interface{~[]Elem}](e Elem, s Slice) {}
func _() {
// related2 can be called with explicit instantiation.
type B1[_ any] interface{}
type B2[_, _ any] interface{}
-func _[T1 B0]()
-func _[T1 B1[T1]]()
-func _[T1 B2 /* ERROR cannot use generic type .* without instantiation */ ]()
+func _[T1 B0]() {}
+func _[T1 B1[T1]]() {}
+func _[T1 B2 /* ERROR cannot use generic type .* without instantiation */ ]() {}
-func _[T1, T2 B0]()
-func _[T1 B1[T1], T2 B1[T2]]()
-func _[T1, T2 B2 /* ERROR cannot use generic type .* without instantiation */ ]()
+func _[T1, T2 B0]() {}
+func _[T1 B1[T1], T2 B1[T2]]() {}
+func _[T1, T2 B2 /* ERROR cannot use generic type .* without instantiation */ ]() {}
-func _[T1 B0, T2 B1[T2]]() // here B1 applies to T2
+func _[T1 B0, T2 B1[T2]]() {} // here B1 applies to T2
// When the type argument is left away, the type bound is
// instantiated for each type parameter with that type
// crash 16
type Foo16[T any] r16 /* ERROR not a type */
-func r16[T any]() Foo16[Foo16[T]]
+func r16[T any]() Foo16[Foo16[T]] { panic(0) }
// crash 17
type Y17 interface{ c() }
c() Y17
Y17 /* ERROR duplicate method */
}
-func F17[T Z17](T)
+func F17[T Z17](T) {}
// crash 18
type o18[T any] []func(_ o18[[]_ /* ERROR cannot use _ */ ])
func F26[Z any]() T26 { return F26[] /* ERROR operand */ }
// crash 27
-func e27[T any]() interface{ x27 /* ERROR not a type */ }
+func e27[T any]() interface{ x27 /* ERROR not a type */ } { panic(0) }
func x27() { e27 /* ERROR cannot infer T */ () }
// A constraint must be an interface; it cannot
// be a type parameter, for instance.
-func _[A interface{ ~int }, B A /* ERROR not an interface */ ]()
+func _[A interface{ ~int }, B A /* ERROR not an interface */ ]() {}
package p
-func f1[T1, T2 any](T1, T2, struct{a T1; b T2})
+func f1[T1, T2 any](T1, T2, struct{a T1; b T2}) {}
func _() {
f1(42, string("foo"), struct /* ERROR does not match inferred type struct\{a int; b string\} */ {a, b int}{})
}
// simplified test case from issue
-func f2[T any](_ []T, _ func(T))
+func f2[T any](_ []T, _ func(T)) {}
func _() {
f2([]string{}, func /* ERROR does not match inferred type func\(string\) */ (f []byte) {})
}
type policy[K, V any] interface{}
type LRU[K, V any] struct{}
-func NewCache[K, V any](p policy[K, V])
+func NewCache[K, V any](p policy[K, V]) {}
func _() {
var lru LRU[int, string]
func (A[T]) m(A[T])
-func f[P interface{m(P)}]()
+func f[P interface{m(P)}]() {}
func _() {
_ = f[A[int]]
-}
\ No newline at end of file
+}
type S struct {}
-func NewS[T any]() *S
+func NewS[T any]() *S { panic(0) }
func (_ *S /* ERROR S is not a generic type */ [T]) M()
type T[_ any] int
-func f[_ any]()
-func g[_, _ any]()
+func f[_ any]() {}
+func g[_, _ any]() {}
func _() {
_ = f[T /* ERROR without instantiation */ ]
_ = g[T /* ERROR without instantiation */ , T /* ERROR without instantiation */ ]
-}
\ No newline at end of file
+}
var _ T1[I2 /* ERROR interface contains type constraints */ ]
var _ T3[int, I2 /* ERROR interface contains type constraints */ , float32]
-func f1[_ any]() int
+func f1[_ any]() int { panic(0) }
var _ = f1[I2 /* ERROR interface contains type constraints */ ]()
-func f3[_, _, _ any]() int
+func f3[_, _, _ any]() int { panic(0) }
var _ = f3[int, I2 /* ERROR interface contains type constraints */ , float32]()
func _(x interface{}) {
)
}
-func _[P any, Q interface{ *P | []P | chan P | map[string]P }]()
-func _[P any, Q interface{ P /* ERROR "cannot embed a type parameter" */ }]()
-func _[P any, Q interface{ ~P /* ERROR "cannot embed a type parameter" */ }]()
-func _[P any, Q interface{ int | P /* ERROR "cannot embed a type parameter" */ }]()
-func _[P any, Q interface{ int | ~P /* ERROR "cannot embed a type parameter" */ }]()
+func _[P any, Q interface{ *P | []P | chan P | map[string]P }]() {}
+func _[P any, Q interface{ P /* ERROR "cannot embed a type parameter" */ }]() {}
+func _[P any, Q interface{ ~P /* ERROR "cannot embed a type parameter" */ }]() {}
+func _[P any, Q interface{ int | P /* ERROR "cannot embed a type parameter" */ }]() {}
+func _[P any, Q interface{ int | ~P /* ERROR "cannot embed a type parameter" */ }]() {}
package p
-func f[_ comparable]()
-func g[_ interface{interface{comparable; ~int|~string}}]()
+func f[_ comparable]() {}
+func g[_ interface{interface{comparable; ~int|~string}}]() {}
func _[P comparable,
Q interface{ comparable; ~int|~string },