Initial commit: Go 1.23 release state

test/convT2X.go

@@ -0,0 +1,195 @@
+// run
+
+// 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.
+
+// Test conversion from non-interface types to the empty interface.
+
+package main
+
+type J interface {
+	Method()
+}
+
+type (
+	U16  uint16
+	U32  uint32
+	U64  uint64
+	U128 [2]uint64
+	F32  float32
+	F64  float64
+	C128 complex128
+	S    string
+	B    []byte
+	M    map[int]int
+	C    chan int
+	Z    struct{}
+)
+
+func (U16) Method()  {}
+func (U32) Method()  {}
+func (U64) Method()  {}
+func (U128) Method() {}
+func (F32) Method()  {}
+func (F64) Method()  {}
+func (C128) Method() {}
+func (S) Method()    {}
+func (B) Method()    {}
+func (M) Method()    {}
+func (C) Method()    {}
+func (Z) Method()    {}
+
+var (
+	u16  = U16(1)
+	u32  = U32(2)
+	u64  = U64(3)
+	u128 = U128{4, 5}
+	f32  = F32(6)
+	f64  = F64(7)
+	c128 = C128(8 + 9i)
+	s    = S("10")
+	b    = B("11")
+	m    = M{12: 13}
+	c    = make(C, 14)
+	z    = Z{}
+	p    = &z
+	pp   = &p
+)
+
+var (
+	iu16  interface{} = u16
+	iu32  interface{} = u32
+	iu64  interface{} = u64
+	iu128 interface{} = u128
+	if32  interface{} = f32
+	if64  interface{} = f64
+	ic128 interface{} = c128
+	is    interface{} = s
+	ib    interface{} = b
+	im    interface{} = m
+	ic    interface{} = c
+	iz    interface{} = z
+	ip    interface{} = p
+	ipp   interface{} = pp
+
+	ju16  J = u16
+	ju32  J = u32
+	ju64  J = u64
+	ju128 J = u128
+	jf32  J = f32
+	jf64  J = f64
+	jc128 J = c128
+	js    J = s
+	jb    J = b
+	jm    J = m
+	jc    J = c
+	jz J = z
+	jp J = p // The method set for *T contains the methods for T.
+	// pp does not implement error.
+)
+
+func second(a ...interface{}) interface{} {
+	return a[1]
+}
+
+func main() {
+	// Test equality.
+	if u16 != iu16 {
+		panic("u16 != iu16")
+	}
+	if u16 != ju16 {
+		panic("u16 != ju16")
+	}
+	if u32 != iu32 {
+		panic("u32 != iu32")
+	}
+	if u32 != ju32 {
+		panic("u32 != ju32")
+	}
+	if u64 != iu64 {
+		panic("u64 != iu64")
+	}
+	if u64 != ju64 {
+		panic("u64 != ju64")
+	}
+	if u128 != iu128 {
+		panic("u128 != iu128")
+	}
+	if u128 != ju128 {
+		panic("u128 != ju128")
+	}
+	if f32 != if32 {
+		panic("f32 != if32")
+	}
+	if f32 != jf32 {
+		panic("f32 != jf32")
+	}
+	if f64 != if64 {
+		panic("f64 != if64")
+	}
+	if f64 != jf64 {
+		panic("f64 != jf64")
+	}
+	if c128 != ic128 {
+		panic("c128 != ic128")
+	}
+	if c128 != jc128 {
+		panic("c128 != jc128")
+	}
+	if s != is {
+		panic("s != is")
+	}
+	if s != js {
+		panic("s != js")
+	}
+	if c != ic {
+		panic("c != ic")
+	}
+	if c != jc {
+		panic("c != jc")
+	}
+	// There are no tests for b and m, as slices and maps are not comparable by ==.
+	if z != iz {
+		panic("z != iz")
+	}
+	if z != jz {
+		panic("z != jz")
+	}
+	if p != ip {
+		panic("p != ip")
+	}
+	if p != jp {
+		panic("p != jp")
+	}
+	if pp != ipp {
+		panic("pp != ipp")
+	}
+	// pp does not implement J.
+
+	// Test that non-interface types can be used as ...interface{} arguments.
+	if got := second(z, p, pp, u16, u32, u64, u128, f32, f64, c128, s, b, m, c); got != ip {
+		println("second: got", got, "want", ip)
+		panic("fail")
+	}
+
+	// Test that non-interface types can be sent on a chan interface{}.
+	const n = 100
+	uc := make(chan interface{})
+	go func() {
+		for i := 0; i < n; i++ {
+			select {
+			case uc <- nil:
+			case uc <- u32:
+			case uc <- u64:
+			case uc <- u128:
+			}
+		}
+	}()
+	for i := 0; i < n; i++ {
+		if got := <-uc; got != nil && got != u32 && got != u64 && got != u128 {
+			println("recv: i", i, "got", got)
+			panic("fail")
+		}
+	}
+}