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master
test/fixedbugs/issue23188.go
32 строки
943 B
Ian Lance Taylor
test: add order of evaluation test case that gccgo got wrong
11 июл 2018, 00:30
11 июл 2018, 00:30
d49572e
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// run // Copyright 2018 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 order of evaluation of index operations. package main func main() { arr := []int{1, 2} // The spec says that in an assignment statement the operands // of all index expressions and pointer indirections on the // left, and the expressions on the right, are evaluated in // the usual order. The usual order means function calls and // channel operations are done first. Then the assignments are // carried out one at a time. The operands of an index // expression include both the array and the index. So this // evaluates as // tmp1 := arr // tmp2 := len(arr) - 1 // tmp3 := len(arr) // arr = arr[:tmp3-1] // tmp1[tmp2] = 3 arr, arr[len(arr)-1] = arr[:len(arr)-1], 3 if len(arr) != 1 || arr[0] != 1 || arr[:2][1] != 3 { panic(arr) } }