Files in this directory are data for Go's API checker ("go tool api", in src/cmd/api).

Each file is a list of API features, one per line.

go1.txt (and similarly named files) are frozen once a version has been

shipped. Each file adds new lines but does not remove any.

except.txt lists features that may disappear without breaking true

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.

Each file in that directory contains a list of features that may be added

to the next release of Go. The files in this directory only affect the

warning output from the go api tool. Each file should be named

nnnnn.txt, after the issue number for the accepted proposal.

(The #nnnnn suffix must also appear at the end of each line in the file;

that will be preserved when next/*.txt is concatenated into go1.XX.txt.)

When you add a file to the api/next directory, you must add at least one file

under doc/next. See doc/README.md for details.