d178c5888f
CL #163058 moves interpretation of platform-specific errors to the syscall package. Package syscall errors implement an Is method which os.IsPermission etc. consult. This results in an unintended semantic change to the os package predicate functions: The following program now prints 'true' where it used to print 'false': package main import "os" type myError struct{ error } func (e myError) Is(target error) bool { return target == os.ErrPermission } func main() { println(os.IsPermission(myError{})) } Change the os package error predicate functions to only examine syscall errors, avoiding this semantic change. This CL does retain one minor semantic change: On Plan9, os.IsPermission used to return true for any error with text containing the string "permission denied". It now only returns true for a syscall.ErrorString containing that text. Change-Id: I6b512b1de6ced46c2f1cc8d264fa2495ae7bf9f5 Reviewed-on: https://go-review.googlesource.com/c/go/+/188817 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Russ Cox <rsc@golang.org> |
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