// Otherwise Switch prints all the errors using base.Error.
//
// See https://go.dev/doc/toolchain#switch.
type Switcher struct {
	TooNew *gover.TooNewError // max go requirement observed
	Errors []error            // errors collected so far
}

// Error reports the error to the Switcher,
// which saves it for processing during Switch.
func (s *Switcher) Error(err error) {

	mcall(coroswitch_m)
}

//go:linkname coroswitch

// coroswitch switches to the goroutine blocked on c
// and then blocks the current goroutine on c.
func coroswitch(c *coro) {
	gp := getg()
	gp.coroarg = c
	mcall(coroswitch_m)
}

// coroswitch_m is the implementation of coroswitch
// that runs on the m stack.
//
// Note: Coroutine switches are expected to happen at
// an order of magnitude (or more) higher frequency

2020-06-29T23:37:27.336155Z	info	Channel switches to new LB policy "pick_first"
2020-06-29T23:37:27.336189Z	info	Subchannel Connectivity change to CONNECTING
2020-06-29T23:37:27.336222Z	info	Starting gateway SDS
2020-06-29T23:37:27.336491Z	info	pickfirstBalancer: HandleSubConnStateChange: 0xc00087d1e0, {CONNECTING <nil>}
2020-06-29T23:37:27.336645Z	info	Channel Connectivity change to CONNECTING

// errorcheck

// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Verify that various erroneous type switches are caught by the compiler.
// Does not compile.

package main

func notused(x interface{}) {
	// The first t is in a different scope than the 2nd t; it cannot
	// be accessed (=> declared and not used error); but it is legal

2020-06-29T23:37:27.336149Z	info	ClientConn switching balancer to "pick_first"
2020-06-29T23:37:27.336155Z	info	Channel switches to new LB policy "pick_first"
2020-06-29T23:37:27.336189Z	info	Subchannel Connectivity change to CONNECTING
2020-06-29T23:37:27.336222Z	info	Starting gateway SDS

		return "C"
	// amd64: `CMPL\s\(.*\), \$1718907950$`
	// arm64: `MOVD\s\$1718907950`, `CMPW\sR.*, R.*$`
	case ".ttf":
		return "D"
	default:
		return ""
	}
}

// use jump tables for type switches to concrete types.
func typeSwitch(x any) int {
	// amd64:`JMP\s\(.*\)\(.*\)$`
	// arm64:`MOVD\s\(R.*\)\(R.*<<3\)`,`JMP\s\(R.*\)$`
	switch x.(type) {
	case int:
		return 0
	case int8:
		return 1

// is implementing (Inter), and some ancillary information.
//
// allocated in non-garbage-collected memory
type ITab struct {
	Inter *InterfaceType
	Type  *Type
	Hash  uint32     // copy of Type.Hash. Used for type switches.
	Fun   [1]uintptr // variable sized. fun[0]==0 means Type does not implement Inter.
}

// EmptyInterface describes the layout of a "interface{}" or a "any."

2020-06-29T23:37:27.336149Z	info	ClientConn switching balancer to "pick_first"
2020-06-29T23:37:27.336155Z	info	Channel switches to new LB policy "pick_first"
2020-06-29T23:37:27.336189Z	info	Subchannel Connectivity change to CONNECTING
2020-06-29T23:37:27.336222Z	info	Starting gateway SDS

env TESTGO_VERSION_SWITCH=loop
! go version
stderr -count=10 '^go: switching from go1.21.1 to go1.21.99 \[depth 9[0-9]\]$'
stderr -count=1 '^go: switching from go1.21.1 to go1.21.99 \[depth 100\]$'
stderr '^go: too many toolchain switches$'

[short] skip

# Internal env vars should not leak to go test or go run.
env TESTGO_VERSION_SWITCH=switch
go version
stdout go1.21.99
go test
stdout clean
go run .
stdout clean

-- go.mod --

	// already running on CPU and there can be lots of them, so a woken up
	// waiter has good chances of losing. In such case it is queued at front
	// of the wait queue. If a waiter fails to acquire the mutex for more than 1ms,
	// it switches mutex to the starvation mode.
	//
	// In starvation mode ownership of the mutex is directly handed off from
	// the unlocking goroutine to the waiter at the front of the queue.