--- /dev/null
+// $G $F.go && $L $F.$A && ./$A.out
+
+// Copyright 2010 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 main
+
+import (
+ "fmt"
+ "math"
+ "strings"
+)
+
+type Error interface {
+ String() string
+}
+
+type ErrorTest struct {
+ name string
+ fn func()
+ err string
+}
+
+var (
+ i, j, k int = 0, 0, 1
+ i8, j8, k8 int8 = 0, 0, 1
+ i16, j16, k16 int16 = 0, 0, 1
+ i32, j32, k32 int32 = 0, 0, 1
+ i64, j64, k64 int64 = 0, 0, 1
+
+ u, v, w uint = 0, 0, 1
+ u8, v8, w8 uint8 = 0, 0, 1
+ u16, v16, w16 uint16 = 0, 0, 1
+ u32, v32, w32 uint32 = 0, 0, 1
+ u64, v64, w64 uint64 = 0, 0, 1
+ up, vp, wp uintptr = 0, 0, 1
+
+ f, g, h float = 0, 0, 1
+ f32, g32, h32 float32 = 0, 0, 1
+ f64, g64, h64, inf, negInf, nan float64 = 0, 0, 1, math.Inf(1), math.Inf(-1), math.NaN()
+
+ c, d, e complex = 0+0i, 0+0i, 1+1i
+ c64, d64, e64 complex64 = 0+0i, 0+0i, 1+1i
+ c128, d128, e128 complex128 = 0+0i, 0+0i, 1+1i
+)
+
+var tmp interface{}
+
+// We could assign to _ but the compiler optimizes it too easily.
+func use(v interface{}) {
+ tmp = v
+}
+
+// Verify error/no error for all types.
+var errorTests = []ErrorTest{
+ // All integer divide by zero should error.
+ ErrorTest{ "int 0/0", func() { use(i/j) }, "divide", },
+// TODO commented out: fails in 8g.
+// ErrorTest{ "int8 0/0", func() { use(i8/j8) }, "divide", },
+ ErrorTest{ "int16 0/0", func() { use(i16/j16) }, "divide", },
+ ErrorTest{ "int32 0/0", func() { use(i32/j32) }, "divide", },
+ ErrorTest{ "int64 0/0", func() { use(i64/j64) }, "divide", },
+
+ ErrorTest{ "int 1/0", func() { use(k/j) }, "divide", },
+// TODO commented out: fails in 8g.
+// ErrorTest{ "int8 1/0", func() { use(k8/j8) }, "divide", },
+ ErrorTest{ "int16 1/0", func() { use(k16/j16) }, "divide", },
+ ErrorTest{ "int32 1/0", func() { use(k32/j32) }, "divide", },
+ ErrorTest{ "int64 1/0", func() { use(k64/j64) }, "divide", },
+
+ ErrorTest{ "uint 0/0", func() { use(u/v) }, "divide", },
+// TODO commented out: fails in 8g.
+// ErrorTest{ "uint8 0/0", func() { use(u8/v8) }, "divide", },
+ ErrorTest{ "uint16 0/0", func() { use(u16/v16) }, "divide", },
+ ErrorTest{ "uint32 0/0", func() { use(u32/v32) }, "divide", },
+ ErrorTest{ "uint64 0/0", func() { use(u64/v64) }, "divide", },
+ ErrorTest{ "uintptr 0/0", func() { use(up/vp) }, "divide", },
+
+ ErrorTest{ "uint 1/0", func() { use(w/v) }, "divide", },
+// TODO commented out: fails in 8g.
+// ErrorTest{ "uint8 1/0", func() { use(w8/v8) }, "divide", },
+ ErrorTest{ "uint16 1/0", func() { use(w16/v16) }, "divide", },
+ ErrorTest{ "uint32 1/0", func() { use(w32/v32) }, "divide", },
+ ErrorTest{ "uint64 1/0", func() { use(w64/v64) }, "divide", },
+ ErrorTest{ "uintptr 1/0", func() { use(wp/vp) }, "divide", },
+
+ // All floating divide by zero should not error.
+ ErrorTest{ "float 0/0", func() { use(f/g) }, "", },
+ ErrorTest{ "float32 0/0", func() { use(f32/g32) }, "", },
+ ErrorTest{ "float64 0/0", func() { use(f64/g64) }, "", },
+
+ ErrorTest{ "float 1/0", func() { use(h/g) }, "", },
+ ErrorTest{ "float32 1/0", func() { use(h32/g32) }, "", },
+ ErrorTest{ "float64 1/0", func() { use(h64/g64) }, "", },
+ ErrorTest{ "float64 inf/0", func() { use(inf/g64) }, "", },
+ ErrorTest{ "float64 -inf/0", func() { use(negInf/g64) }, "", },
+ ErrorTest{ "float64 nan/0", func() { use(nan/g64) }, "", },
+
+ // All complex divide by zero should not error.
+ ErrorTest{ "complex 0/0", func() { use(c/d) }, "", },
+ ErrorTest{ "complex64 0/0", func() { use(c64/d64) }, "", },
+ ErrorTest{ "complex128 0/0", func() { use(c128/d128) }, "", },
+
+ ErrorTest{ "complex 1/0", func() { use(e/d) }, "", },
+ ErrorTest{ "complex64 1/0", func() { use(e64/d64) }, "", },
+ ErrorTest{ "complex128 1/0", func() { use(e128/d128) }, "", },
+}
+
+func error(fn func()) (error string) {
+ defer func() {
+ if e := recover(); e != nil {
+ error = e.(Error).String()
+ }
+ }()
+ fn()
+ return ""
+}
+
+type FloatTest struct{
+ name string
+ f, g float64
+ out float64
+}
+
+var floatTests = []FloatTest{
+ FloatTest{"float64 0/0", 0, 0, nan },
+ FloatTest{"float64 nan/0", nan, 0, nan },
+ FloatTest{"float64 inf/0", inf, 0, inf },
+ FloatTest{"float64 -inf/0", negInf, 0, negInf },
+}
+
+func alike(a, b float64) bool {
+ switch {
+ case math.IsNaN(a) && math.IsNaN(b):
+ return true
+ case a == b:
+ return math.Signbit(a) == math.Signbit(b)
+ }
+ return false
+}
+
+func main() {
+ for _, t := range errorTests {
+ err := error(t.fn)
+ switch {
+ case t.err == "" && err == "":
+ // fine
+ case t.err != "" && err == "":
+ fmt.Printf("%s: expected %q; got no error\n", t.name, t.err)
+ case t.err == "" && err != "":
+ fmt.Printf("%s: expected no error; got %q\n", t.name, err)
+ case t.err != "" && err != "":
+ if strings.Index(err, t.err) < 0 {
+ fmt.Printf("%s: expected %q; got %q\n", t.name, t.err, err)
+ continue
+ }
+ }
+ }
+
+ // At this point we know we don't error on the values we're testing
+ for _, t := range floatTests {
+ x := t.f/t.g
+ if !alike(x, t.out) {
+ fmt.Printf("%s: expected %g error; got %g\n", t.name, t.out, x)
+ }
+ }
+}