[go] doc: pre-announce removal of gotypesalias and asynctimerchan GODEBUG flags

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Robert Griesemer (Gerrit)

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Dec 2, 2025, 3:00:17 PM (13 hours ago) Dec 2
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doc: pre-announce removal of gotypesalias and asynctimerchan GODEBUG flags

For #76472.
Change-Id: I4299e7f474e314810883dc4f50be6afba8c3e3e7

Change diff

diff --git a/doc/godebug.md b/doc/godebug.md
index d6bb186..28a2dc5 100644
--- a/doc/godebug.md
+++ b/doc/godebug.md
@@ -306,7 +306,7 @@
 and [`Timer.Reset`](/pkg/time/#Timer.Reset) method results much easier.
 The [`asynctimerchan` setting](/pkg/time/#NewTimer) disables this change.
 There are no runtime metrics for this change,
-This setting may be removed in a future release, Go 1.27 at the earliest.
+This setting will be removed in Go 1.27.
 
 Go 1.23 changed the mode bits reported by [`os.Lstat`](/pkg/os#Lstat) and [`os.Stat`](/pkg/os#Stat)
 for reparse points, which can be controlled with the `winsymlink` setting.
@@ -385,7 +385,7 @@
 [`gotypesalias` setting](/pkg/go/types#Alias).
 For Go 1.22 it defaults to `gotypesalias=0`.
 For Go 1.23, `gotypesalias=1` will become the default.
-This setting will be removed in a future release, Go 1.27 at the earliest.
+This setting will be removed in Go 1.27.
 
 Go 1.22 changed the default minimum TLS version supported by both servers
 and clients to TLS 1.2. The default can be reverted to TLS 1.0 using the
diff --git a/doc/next/6-stdlib/99-minor/go/types/76472.md b/doc/next/6-stdlib/99-minor/go/types/76472.md
new file mode 100644
index 0000000..f9c884b
--- /dev/null
+++ b/doc/next/6-stdlib/99-minor/go/types/76472.md
@@ -0,0 +1,4 @@
+The `asynctimerchan` GODEBUG setting introduced in [Go 1.23](/doc/godebug#go-123)
+will be removed in the next major Go release.
+Starting in Go 1.27, the [time](/pkg/time) package will always use unbuffered
+(synchronous) channels for timers regardless of GODEBUG setting or go.mod language version.
diff --git a/doc/next/6-stdlib/99-minor/time/76472.md b/doc/next/6-stdlib/99-minor/time/76472.md
new file mode 100644
index 0000000..bddca82
--- /dev/null
+++ b/doc/next/6-stdlib/99-minor/time/76472.md
@@ -0,0 +1,5 @@
+The `gotypesalias` GODEBUG setting introduced in [Go 1.22](/doc/godebug#go-122)
+will be removed in the next major Go release.
+Starting in Go 1.27, the [go/types](/pkg/go/types) package will always produce an
+[Alias type](/pkg/go/types#Alias) for the representation of [type aliases](/ref/spec#Type_declarations)
+regardless of GODEBUG setting or go.mod language version.

Change information

Files:
  • M doc/godebug.md
  • A doc/next/6-stdlib/99-minor/go/types/76472.md
  • A doc/next/6-stdlib/99-minor/time/76472.md
Change size: S
Delta: 3 files changed, 11 insertions(+), 2 deletions(-)
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Robert Griesemer (Gerrit)

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Dec 2, 2025, 3:09:21 PM (13 hours ago) Dec 2
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Robert Griesemer uploaded new patchset

Robert Griesemer uploaded patch set #2 to this change.
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Robert Griesemer (Gerrit)

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Alan Donovan (Gerrit)

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Robert Griesemer (Gerrit)

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Gopher Robot (Gerrit)

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Dec 2, 2025, 7:18:15 PM (8 hours ago) Dec 2
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Gopher Robot submitted the change

Change information

Commit message:
doc: pre-announce removal of gotypesalias and asynctimerchan GODEBUG flags

This announcement follows the policy outlined in #76163.

For #76472.
Change-Id: I4299e7f474e314810883dc4f50be6afba8c3e3e7
Auto-Submit: Robert Griesemer <g...@google.com>
Reviewed-by: Alan Donovan <adon...@google.com>
Reviewed-by: Robert Griesemer <g...@google.com>
Files:
  • M doc/godebug.md
  • A doc/next/6-stdlib/99-minor/go/types/76472.md
  • A doc/next/6-stdlib/99-minor/time/76472.md
Change size: S
Delta: 3 files changed, 11 insertions(+), 2 deletions(-)
Branch: refs/heads/master
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