commit | f2c7e78592973436a55cdfc4bca2fc3bce526cad | [log] [tgz] |
---|---|---|
author | Robert Griesemer <gri@golang.org> | Tue Jun 14 18:30:44 2022 -0700 |
committer | Robert Griesemer <gri@golang.org> | Tue Jun 21 23:17:35 2022 +0000 |
tree | 3450eff7a83a7bbd06841f7e86bf408f3fbda274 | |
parent | ab422f2749bc21514cb22d444bae460f5fa22376 [diff] |
spec: document operations which accept []byte|string constrained types Pre-1.18, as special cases, the built-in operations append and copy accepted strings as second arguments if the first argument was a byte slice. With Go 1.18, these two built-ins as well as slice expressions rely on the notion of core types in their specification. Because we want to permit slice expressions, append, and copy to operate on (1st or 2nd operands) that are type parameters restricted by []byte | string (and variations thereof), the simple notion of core type is not sufficient for these three operations. (The compiler already permits such more relaxed operations). In the section on core types, add a paragraph and examples introducing the (artificial) core type "bypestring", which describes the core type of type sets whose underlying types are []byte or string. Adjust the rules for slice expressions, append, and copy accordingly. Also (unrelated): Adjust prose in the only paragraph where we used personal speech ("we") to impersonal speech, to match the rest of the spec. Fixes #52859. Change-Id: I1cbda3095a1136fb99334cc3a62a9a349a27ce1e Reviewed-on: https://go-review.googlesource.com/c/go/+/412234 Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Robert Griesemer <gri@google.com>
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