go expr3 源码
golang expr3 代码
文件路径：/src/cmd/compile/internal/types2/testdata/check/expr3.go
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package expr3
import "time"
func indexes() {
var x int
_ = 1 /* ERROR "cannot index" */ [0]
_ = x /* ERROR "cannot index" */ [0]
_ = ( /* ERROR "cannot slice" */ 12 + 3)[1:2]
var a [10]int
_ = a[true /* ERROR "cannot convert" */ ]
_ = a["foo" /* ERROR "cannot convert" */ ]
_ = a[1.1 /* ERROR "truncated" */ ]
_ = a[1.0]
_ = a[- /* ERROR "negative" */ 1]
_ = a[- /* ERROR "negative" */ 1 :]
_ = a[: - /* ERROR "negative" */ 1]
_ = a[: /* ERROR "middle index required" */ : /* ERROR "final index required" */ ]
_ = a[0: /* ERROR "middle index required" */ : /* ERROR "final index required" */ ]
_ = a[0: /* ERROR "middle index required" */ :10]
_ = a[:10:10]
var a0 int
a0 = a[0]
_ = a0
var a1 int32
a1 = a /* ERROR "cannot use .* in assignment" */ [1]
_ = a1
_ = a[9]
_ = a[10 /* ERROR "index .* out of bounds" */ ]
_ = a[1 /* ERROR "overflows" */ <<100]
_ = a[1<< /* ERROR "constant shift overflow" */ 1000] // no out-of-bounds follow-on error
_ = a[10:]
_ = a[:10]
_ = a[10:10]
_ = a[11 /* ERROR "index .* out of bounds" */ :]
_ = a[: 11 /* ERROR "index .* out of bounds" */ ]
_ = a[: 1 /* ERROR "overflows" */ <<100]
_ = a[:10:10]
_ = a[:11 /* ERROR "index .* out of bounds" */ :10]
_ = a[:10:11 /* ERROR "index .* out of bounds" */ ]
_ = a[10:0 /* ERROR "invalid slice indices" */ :10]
_ = a[0:10:0 /* ERROR "invalid slice indices" */ ]
_ = a[10:0 /* ERROR "invalid slice indices" */:0]
_ = &a /* ERROR "cannot take address" */ [:10]
pa := &a
_ = pa[9]
_ = pa[10 /* ERROR "index .* out of bounds" */ ]
_ = pa[1 /* ERROR "overflows" */ <<100]
_ = pa[10:]
_ = pa[:10]
_ = pa[10:10]
_ = pa[11 /* ERROR "index .* out of bounds" */ :]
_ = pa[: 11 /* ERROR "index .* out of bounds" */ ]
_ = pa[: 1 /* ERROR "overflows" */ <<100]
_ = pa[:10:10]
_ = pa[:11 /* ERROR "index .* out of bounds" */ :10]
_ = pa[:10:11 /* ERROR "index .* out of bounds" */ ]
_ = pa[10:0 /* ERROR "invalid slice indices" */ :10]
_ = pa[0:10:0 /* ERROR "invalid slice indices" */ ]
_ = pa[10:0 /* ERROR "invalid slice indices" */ :0]
_ = &pa /* ERROR "cannot take address" */ [:10]
var b [0]int
_ = b[0 /* ERROR "index .* out of bounds" */ ]
_ = b[:]
_ = b[0:]
_ = b[:0]
_ = b[0:0]
_ = b[0:0:0]
_ = b[1 /* ERROR "index .* out of bounds" */ :0:0]
var s []int
_ = s[- /* ERROR "negative" */ 1]
_ = s[- /* ERROR "negative" */ 1 :]
_ = s[: - /* ERROR "negative" */ 1]
_ = s[0]
_ = s[1:2]
_ = s[2:1] /* ERROR "invalid slice indices" */
_ = s[2:]
_ = s[: 1 /* ERROR "overflows" */ <<100]
_ = s[1 /* ERROR "overflows" */ <<100 :]
_ = s[1 /* ERROR "overflows" */ <<100 : 1 /* ERROR "overflows" */ <<100]
_ = s[: /* ERROR "middle index required" */ : /* ERROR "final index required" */ ]
_ = s[:10:10]
_ = s[10:0 /* ERROR "invalid slice indices" */ :10]
_ = s[0:10:0 /* ERROR "invalid slice indices" */ ]
_ = s[10:0 /* ERROR "invalid slice indices" */ :0]
_ = &s /* ERROR "cannot take address" */ [:10]
var m map[string]int
_ = m[0 /* ERROR "cannot use .* in map index" */ ]
_ = m /* ERROR "cannot slice" */ ["foo" : "bar"]
_ = m["foo"]
// ok is of type bool
type mybool bool
var ok mybool
_, ok = m["bar"]
_ = ok
_ = m[0 /* ERROR "cannot use 0" */ ] + "foo" // ERROR "mismatched types int and untyped string"
var t string
_ = t[- /* ERROR "negative" */ 1]
_ = t[- /* ERROR "negative" */ 1 :]
_ = t[: - /* ERROR "negative" */ 1]
_ = t[1:2:3 /* ERROR "3-index slice of string" */ ]
_ = "foo"[1:2:3 /* ERROR "3-index slice of string" */ ]
var t0 byte
t0 = t[0]
_ = t0
var t1 rune
t1 = t /* ERROR "cannot use .* in assignment" */ [2]
_ = t1
_ = ("foo" + "bar")[5]
_ = ("foo" + "bar")[6 /* ERROR "index .* out of bounds" */ ]
const c = "foo"
_ = c[- /* ERROR "negative" */ 1]
_ = c[- /* ERROR "negative" */ 1 :]
_ = c[: - /* ERROR "negative" */ 1]
var c0 byte
c0 = c[0]
_ = c0
var c2 float32
c2 = c /* ERROR "cannot use .* in assignment" */ [2]
_ = c[3 /* ERROR "index .* out of bounds" */ ]
_ = ""[0 /* ERROR "index .* out of bounds" */ ]
_ = c2
_ = s[1<<30] // no compile-time error here
// issue 4913
type mystring string
var ss string
var ms mystring
var i, j int
ss = "foo"[1:2]
ss = "foo"[i:j]
ms = "foo" /* ERROR "cannot use .* in assignment" */ [1:2]
ms = "foo" /* ERROR "cannot use .* in assignment" */ [i:j]
_, _ = ss, ms
}
type T struct {
x int
y func()
}
func (*T) m() {}
func method_expressions() {
_ = T.a /* ERROR "no field or method" */
_ = T.x /* ERROR "has no method" */
_ = T.m /* ERROR "cannot call pointer method m on T" */
_ = (*T).m
var f func(*T) = T.m /* ERROR "cannot call pointer method m on T" */
var g func(*T) = (*T).m
_, _ = f, g
_ = T.y /* ERROR "has no method" */
_ = (*T).y /* ERROR "has no method" */
}
func struct_literals() {
type T0 struct {
a, b, c int
}
type T1 struct {
T0
a, b int
u float64
s string
}
// keyed elements
_ = T1{}
_ = T1{a: 0, 1 /* ERROR "mixture of .* elements" */ }
_ = T1{aa /* ERROR "unknown field" */ : 0}
_ = T1{1 /* ERROR "invalid field name" */ : 0}
_ = T1{a: 0, s: "foo", u: 0, a /* ERROR "duplicate field" */: 10}
_ = T1{a: "foo" /* ERROR "cannot use .* in struct literal" */ }
_ = T1{c /* ERROR "unknown field" */ : 0}
_ = T1{T0: { /* ERROR "missing type" */ }} // struct literal element type may not be elided
_ = T1{T0: T0{}}
_ = T1{T0 /* ERROR "invalid field name" */ .a: 0}
// unkeyed elements
_ = T0{1, 2, 3}
_ = T0{1, b /* ERROR "mixture" */ : 2, 3}
_ = T0{1, 2} /* ERROR "too few values" */
_ = T0{1, 2, 3, 4 /* ERROR "too many values" */ }
_ = T0{1, "foo" /* ERROR "cannot use .* in struct literal" */, 3.4 /* ERROR "cannot use .*\(truncated\)" */}
// invalid type
type P *struct{
x int
}
_ = P /* ERROR "invalid composite literal type" */ {}
// unexported fields
_ = time.Time{}
_ = time.Time{sec /* ERROR "unknown field" */ : 0}
_ = time.Time{
0 /* ERROR implicit assignment to unexported field wall in time.Time literal */,
0 /* ERROR implicit assignment */ ,
nil /* ERROR implicit assignment */ ,
}
}
func array_literals() {
type A0 [0]int
_ = A0{}
_ = A0{0 /* ERROR "index .* out of bounds" */}
_ = A0{0 /* ERROR "index .* out of bounds" */ : 0}
type A1 [10]int
_ = A1{}
_ = A1{0, 1, 2}
_ = A1{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
_ = A1{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 /* ERROR "index .* out of bounds" */ }
_ = A1{- /* ERROR "negative" */ 1: 0}
_ = A1{8: 8, 9}
_ = A1{8: 8, 9, 10 /* ERROR "index .* out of bounds" */ }
_ = A1{0, 1, 2, 0 /* ERROR "duplicate index" */ : 0, 3: 3, 4}
_ = A1{5: 5, 6, 7, 3: 3, 4}
_ = A1{5: 5, 6, 7, 3: 3, 4, 5 /* ERROR "duplicate index" */ }
_ = A1{10 /* ERROR "index .* out of bounds" */ : 10, 10 /* ERROR "index .* out of bounds" */ : 10}
_ = A1{5: 5, 6, 7, 3: 3, 1 /* ERROR "overflows" */ <<100: 4, 5 /* ERROR "duplicate index" */ }
_ = A1{5: 5, 6, 7, 4: 4, 1 /* ERROR "overflows" */ <<100: 4}
_ = A1{2.0}
_ = A1{2.1 /* ERROR "truncated" */ }
_ = A1{"foo" /* ERROR "cannot use .* in array or slice literal" */ }
// indices must be integer constants
i := 1
const f = 2.1
const s = "foo"
_ = A1{i /* ERROR "index i must be integer constant" */ : 0}
_ = A1{f /* ERROR "truncated" */ : 0}
_ = A1{s /* ERROR "cannot convert" */ : 0}
a0 := [...]int{}
assert(len(a0) == 0)
a1 := [...]int{0, 1, 2}
assert(len(a1) == 3)
var a13 [3]int
var a14 [4]int
a13 = a1
a14 = a1 /* ERROR "cannot use .* in assignment" */
_, _ = a13, a14
a2 := [...]int{- /* ERROR "negative" */ 1: 0}
_ = a2
a3 := [...]int{0, 1, 2, 0 /* ERROR "duplicate index" */ : 0, 3: 3, 4}
assert(len(a3) == 5) // somewhat arbitrary
a4 := [...]complex128{0, 1, 2, 1<<10-2: -1i, 1i, 400: 10, 12, 14}
assert(len(a4) == 1024)
// composite literal element types may be elided
type T []int
_ = [10]T{T{}, {}, 5: T{1, 2, 3}, 7: {1, 2, 3}}
a6 := [...]T{T{}, {}, 5: T{1, 2, 3}, 7: {1, 2, 3}}
assert(len(a6) == 8)
// recursively so
_ = [10][10]T{{}, [10]T{{}}, {{1, 2, 3}}}
// from the spec
type Point struct { x, y float32 }
_ = [...]Point{Point{1.5, -3.5}, Point{0, 0}}
_ = [...]Point{{1.5, -3.5}, {0, 0}}
_ = [][]int{[]int{1, 2, 3}, []int{4, 5}}
_ = [][]int{{1, 2, 3}, {4, 5}}
_ = [...]*Point{&Point{1.5, -3.5}, &Point{0, 0}}
_ = [...]*Point{{1.5, -3.5}, {0, 0}}
}
func slice_literals() {
type S0 []int
_ = S0{}
_ = S0{0, 1, 2}
_ = S0{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
_ = S0{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
_ = S0{- /* ERROR "negative" */ 1: 0}
_ = S0{8: 8, 9}
_ = S0{8: 8, 9, 10}
_ = S0{0, 1, 2, 0 /* ERROR "duplicate index" */ : 0, 3: 3, 4}
_ = S0{5: 5, 6, 7, 3: 3, 4}
_ = S0{5: 5, 6, 7, 3: 3, 4, 5 /* ERROR "duplicate index" */ }
_ = S0{10: 10, 10 /* ERROR "duplicate index" */ : 10}
_ = S0{5: 5, 6, 7, 3: 3, 1 /* ERROR "overflows" */ <<100: 4, 5 /* ERROR "duplicate index" */ }
_ = S0{5: 5, 6, 7, 4: 4, 1 /* ERROR "overflows" */ <<100: 4}
_ = S0{2.0}
_ = S0{2.1 /* ERROR "truncated" */ }
_ = S0{"foo" /* ERROR "cannot use .* in array or slice literal" */ }
// indices must be resolved correctly
const index1 = 1
_ = S0{index1: 1}
_ = S0{index2: 2}
_ = S0{index3 /* ERROR "undeclared name" */ : 3}
// indices must be integer constants
i := 1
const f = 2.1
const s = "foo"
_ = S0{i /* ERROR "index i must be integer constant" */ : 0}
_ = S0{f /* ERROR "truncated" */ : 0}
_ = S0{s /* ERROR "cannot convert" */ : 0}
// composite literal element types may be elided
type T []int
_ = []T{T{}, {}, 5: T{1, 2, 3}, 7: {1, 2, 3}}
_ = [][]int{{1, 2, 3}, {4, 5}}
// recursively so
_ = [][]T{{}, []T{{}}, {{1, 2, 3}}}
// issue 17954
type T0 *struct { s string }
_ = []T0{{}}
_ = []T0{{"foo"}}
type T1 *struct{ int }
_ = []T1{}
_ = []T1{{0}, {1}, {2}}
type T2 T1
_ = []T2{}
_ = []T2{{0}, {1}, {2}}
_ = map[T0]T2{}
_ = map[T0]T2{{}: {}}
}
const index2 int = 2
type N int
func (N) f() {}
func map_literals() {
type M0 map[string]int
type M1 map[bool]int
type M2 map[*int]int
_ = M0{}
_ = M0{1 /* ERROR "missing key" */ }
_ = M0{1 /* ERROR "cannot use .* in map literal" */ : 2}
_ = M0{"foo": "bar" /* ERROR "cannot use .* in map literal" */ }
_ = M0{"foo": 1, "bar": 2, "foo" /* ERROR "duplicate key" */ : 3 }
_ = map[interface{}]int{2: 1, 2 /* ERROR "duplicate key" */ : 1}
_ = map[interface{}]int{int(2): 1, int16(2): 1}
_ = map[interface{}]int{int16(2): 1, int16 /* ERROR "duplicate key" */ (2): 1}
type S string
_ = map[interface{}]int{"a": 1, "a" /* ERROR "duplicate key" */ : 1}
_ = map[interface{}]int{"a": 1, S("a"): 1}
_ = map[interface{}]int{S("a"): 1, S /* ERROR "duplicate key" */ ("a"): 1}
_ = map[interface{}]int{1.0: 1, 1.0 /* ERROR "duplicate key" */: 1}
_ = map[interface{}]int{int64(-1): 1, int64 /* ERROR "duplicate key" */ (-1) : 1}
_ = map[interface{}]int{^uint64(0): 1, ^ /* ERROR "duplicate key" */ uint64(0): 1}
_ = map[interface{}]int{complex(1,2): 1, complex /* ERROR "duplicate key" */ (1,2) : 1}
type I interface {
f()
}
_ = map[I]int{N(0): 1, N(2): 1}
_ = map[I]int{N(2): 1, N /* ERROR "duplicate key" */ (2): 1}
// map keys must be resolved correctly
key1 := "foo"
_ = M0{key1: 1}
_ = M0{key2: 2}
_ = M0{key3 /* ERROR "undeclared name" */ : 2}
var value int
_ = M1{true: 1, false: 0}
_ = M2{nil: 0, &value: 1}
// composite literal element types may be elided
type T [2]int
_ = map[int]T{0: T{3, 4}, 1: {5, 6}}
// recursively so
_ = map[int][]T{0: {}, 1: {{}, T{1, 2}}}
// composite literal key types may be elided
_ = map[T]int{T{3, 4}: 0, {5, 6}: 1}
// recursively so
_ = map[[2]T]int{{}: 0, {{}}: 1, [2]T{{}}: 2, {T{1, 2}}: 3}
// composite literal element and key types may be elided
_ = map[T]T{{}: {}, {1, 2}: T{3, 4}, T{4, 5}: {}}
_ = map[T]M0{{} : {}, T{1, 2}: M0{"foo": 0}, {1, 3}: {"foo": 1}}
// recursively so
_ = map[[2]T][]T{{}: {}, {{}}: {{}, T{1, 2}}, [2]T{{}}: nil, {T{1, 2}}: {{}, {}}}
// from the spec
type Point struct { x, y float32 }
_ = map[string]Point{"orig": {0, 0}}
_ = map[*Point]string{{0, 0}: "orig"}
// issue 17954
type T0 *struct{ s string }
type T1 *struct{ int }
type T2 T1
_ = map[T0]T2{}
_ = map[T0]T2{{}: {}}
}
var key2 string = "bar"
type I interface {
m()
}
type I2 interface {
m(int)
}
type T1 struct{}
type T2 struct{}
func (T2) m(int) {}
type mybool bool
func type_asserts() {
var x int
_ = x /* ERROR "not an interface" */ .(int)
var e interface{}
var ok bool
x, ok = e.(int)
_ = ok
// ok value is of type bool
var myok mybool
_, myok = e.(int)
_ = myok
var t I
_ = t /* ERROR "use of .* outside type switch" */ .(type)
_ = t /* ERROR "method m has pointer receiver" */ .(T)
_ = t.(*T)
_ = t /* ERROR "missing method m" */ .(T1)
_ = t /* ERROR "wrong type for method m" */ .(T2)
_ = t /* STRICT "wrong type for method m" */ .(I2) // only an error in strict mode (issue 8561)
// e doesn't statically have an m, but may have one dynamically.
_ = e.(I2)
}
func f0() {}
func f1(x int) {}
func f2(u float32, s string) {}
func fs(s []byte) {}
func fv(x ...int) {}
func fi(x ... interface{}) {}
func (T) fm(x ...int)
func g0() {}
func g1() int { return 0}
func g2() (u float32, s string) { return }
func gs() []byte { return nil }
func _calls() {
var x int
var y float32
var s []int
f0()
_ = f0 /* ERROR "used as value" */ ()
f0(g0 /* ERROR "too many arguments" */ )
f1(0)
f1(x)
f1(10.0)
f1 /* ERROR "not enough arguments in call to f1\n\thave \(\)\n\twant \(int\)" */ ()
f1(x, y /* ERROR "too many arguments in call to f1\n\thave \(int, float32\)\n\twant \(int\)" */ )
f1(s /* ERROR "cannot use .* in argument" */ )
f1(x ... /* ERROR "cannot use ..." */ )
f1(g0 /* ERROR "used as value" */ ())
f1(g1())
f1(g2 /* ERROR "too many arguments in call to f1\n\thave \(float32, string\)\n\twant \(int\)" */ ())
f2 /* ERROR "not enough arguments in call to f2\n\thave \(\)\n\twant \(float32, string\)" */ ()
f2(3.14 /* ERROR "not enough arguments in call to f2\n\thave \(number\)\n\twant \(float32, string\)" */ )
f2(3.14, "foo")
f2(x /* ERROR "cannot use .* in argument" */ , "foo")
f2(g0 /* ERROR "used as value" */ ())
f2(g1 /* ERROR "not enough arguments in call to f2\n\thave \(int\)\n\twant \(float32, string\)" */ ())
f2(g2())
fs /* ERROR "not enough arguments" */ ()
fs(g0 /* ERROR "used as value" */ ())
fs(g1 /* ERROR "cannot use .* in argument" */ ())
fs(g2 /* ERROR "too many arguments" */ ())
fs(gs())
fv()
fv(1, 2.0, x)
fv(s /* ERROR "cannot use .* in argument" */ )
fv(s...)
fv(x /* ERROR "cannot use" */ ...)
fv(1, s /* ERROR "too many arguments" */ ... )
fv(gs /* ERROR "cannot use .* in argument" */ ())
fv(gs /* ERROR "cannot use .* in argument" */ ()...)
var t T
t.fm()
t.fm(1, 2.0, x)
t.fm(s /* ERROR "cannot use .* in argument" */ )
t.fm(g1())
t.fm(1, s /* ERROR "too many arguments" */ ... )
t.fm(gs /* ERROR "cannot use .* in argument" */ ())
t.fm(gs /* ERROR "cannot use .* in argument" */ ()...)
T.fm(t, )
T.fm(t, 1, 2.0, x)
T.fm(t, s /* ERROR "cannot use .* in argument" */ )
T.fm(t, g1())
T.fm(t, 1, s /* ERROR "too many arguments" */ ... )
T.fm(t, gs /* ERROR "cannot use .* in argument" */ ())
T.fm(t, gs /* ERROR "cannot use .* in argument" */ ()...)
var i interface{ fm(x ...int) } = t
i.fm()
i.fm(1, 2.0, x)
i.fm(s /* ERROR "cannot use .* in argument" */ )
i.fm(g1())
i.fm(1, s /* ERROR "too many arguments" */ ... )
i.fm(gs /* ERROR "cannot use .* in argument" */ ())
i.fm(gs /* ERROR "cannot use .* in argument" */ ()...)
fi()
fi(1, 2.0, x, 3.14, "foo")
fi(g2())
fi(0, g2)
fi(0, g2 /* ERROR "2-valued g2" */ ())
}
func issue6344() {
type T []interface{}
var x T
fi(x...) // ... applies also to named slices
}
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