go/types: incorrect behavior for string conversions of byte slices #23536
Description
What version of Go are you using (go version)?
go version go1.9.2 linux/amd64
Does this issue reproduce with the latest release?
yes
What did you do?
It looks the definitions for slice of bytes are not consistent between spec and the builtin docs.
In spec
A non-constant value x can be converted to type T in any of these cases:
...
* x is a string and T is a slice of bytes or runes.
In he builtin docs
The copy built-in function ....
(As a special case, it also will copy bytes from a string to a slice of bytes.)
However:
package main
type T byte
func main() {
var x []T
str := "abc"
x = []T(str) // okay
copy(x, str) // arguments to copy have different element types: []T and string
_ = append(x, str...) // cannot use <node SPTR> (type *uint8) as type *T in argument to runtime.memmove
}
[edit] It looks []T is treated as a slice of bytes in x = []T(str), but not in the copy and append calls.
What did you expect to see?
all fail to compile or all compile okay.
What did you see instead?
non-consistent behavior
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