Release notes should be added to `next` by editing existing files or creating
new files. **Do not add RELNOTE=yes comments in CLs.** Instead, add a file to
the CL (or ask the author to do so).

At the end of the development cycle, the files will be merged by being
concatenated in sorted order by pathname. Files in the directory matching the
glob "*stdlib/*minor" are treated specially. They should be in subdirectories

compatibility.

Starting with go1.19.txt, each API feature line must end in "#nnnnn"
giving the GitHub issue number of the proposal issue that accepted
the new API. This helps with our end-of-cycle audit of new APIs.
The same requirement applies to next/* (described below), which will
become a go1.XX.txt for XX >= 19.

The next/ directory contains the only files intended to be mutated.

	AMOMINW		X5, (X6), X7			// af235386
	AMOMIND		X5, (X6), X7			// af335386
	AMOMINUW	X5, (X6), X7			// af2353c6
	AMOMINUD	X5, (X6), X7			// af3353c6

	// 10.1: Base Counters and Timers
	RDCYCLE		X5				// f32200c0
	RDTIME		X5				// f32210c0
	RDINSTRET	X5				// f32220c0

	// 11.5: Single-Precision Load and Store Instructions
	FLW	(X5), F0				// 07a00200
	FLW	4(X5), F0				// 07a04200

of Go values and free that space manually all at once, safely. The purpose
of this functionality is to improve efficiency: manually freeing memory
before a garbage collection delays that cycle. Less frequent cycles means
the CPU cost of the garbage collector is incurred less frequently.

This functionality in this package is mostly captured in the Arena type.

## Supported Versions

We support the past two Go releases (for example, Go 1.17.x and Go 1.18.x when Go 1.18.x is the latest stable release).

See https://go.dev/wiki/Go-Release-Cycle and in particular the
[Release Maintenance](https://go.dev/wiki/Go-Release-Cycle#release-maintenance)
part of that page.

## Reporting a Vulnerability

	name := fromPath
	if canonical, ok := w.importMap[fromDir][fromPath]; ok {
		name = canonical
	}

	pkg := w.imported[name]
	if pkg != nil {
		if pkg == &importing {
			log.Fatalf("cycle importing package %q", name)
		}
		return pkg, nil
	}
	w.imported[name] = &importing

	// Determine package files.
	dir := w.importDir[name]
	if dir == "" {