go/types, types2: implement Alias proposal (export API)

[gostls13.git] / doc / godebug.md

diff --git a/doc/godebug.md b/doc/godebug.md
index f35abe11042635fb73b3edc713e6ad442c5e3b12..e4978b9d26334e3279db1715ed99ed3797b2092f 100644 (file)
--- a/doc/godebug.md
+++ b/doc/godebug.md
@@ -129,7 +129,7 @@ and the [go command documentation](/cmd/go#hdr-Build_and_test_caching).
 ### Go 1.22
 
 Go 1.22 adds a configurable limit to control the maximum acceptable RSA key size
-that can be used in TLS handshakes, controlled by the [`tlsmaxrsasize`setting](/pkg/crypto/tls#Conn.Handshake).
+that can be used in TLS handshakes, controlled by the [`tlsmaxrsasize` setting](/pkg/crypto/tls#Conn.Handshake).
 The default is tlsmaxrsasize=8192, limiting RSA to 8192-bit keys. To avoid
 denial of service attacks, this setting and default was backported to Go
 1.19.13, Go 1.20.8, and Go 1.21.1.
@@ -138,6 +138,19 @@ Go 1.22 made it an error for a request or response read by a net/http
 client or server to have an empty Content-Length header.
 This behavior is controlled by the `httplaxcontentlength` setting.
 
+Go 1.22 changed the behavior of ServeMux to accept extended
+patterns and unescape both patterns and request paths by segment.
+This behavior can be controlled by the
+[`httpmuxgo121` setting](/pkg/net/http/#ServeMux).
+
+Go 1.22 added the [Alias type](/pkg/go/types#Alias) to [go/types](/pkg/go/types)
+for the explicit representation of [type aliases](/ref/spec#Type_declarations).
+Whether the type checker produces `Alias` types or not is controlled by the
+[`gotypesalias` setting](/pkg/go/types#Alias).
+For Go 1.22 it defaults to `gotypesalias=0`.
+For Go 1.23, `gotypealias=1` will become the default.
+This setting will be removed in a future release, Go 1.24 at the earliest.
+
 ### Go 1.21
 
 Go 1.21 made it a run-time error to call `panic` with a nil interface value,