|  | 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. | 
|  |  | 
|  | next.txt is the only file intended to be mutated. It's a list of | 
|  | features that may be added to the next version. It only affects | 
|  | warning output from the go api tool. |