DRAFT RELEASE NOTES — Introduction to Go 1.15

Go 1.15 is not yet released. These are work-in-progress release notes. Go 1.15 is expected to be released in August 2020.

Changes to the language

TODO

Ports

TODO

Tools

TODO

Go command

TODO

Flag parsing

Various flag parsing issues in go test and go vet have been fixed. Notably, flags specified in GOFLAGS are handled more consistently, and the -outputdir flag now interprets relative paths relative to the working directory of the go command (rather than the working directory of each individual test).

Runtime

TODO

Core library

TODO

testing

The testing.T type now has a Deadline method that reports the time at which the test binary will have exceeded its timeout.

Minor changes to the library

As always, there are various minor changes and updates to the library, made with the Go 1 promise of compatibility in mind.

TODO

runtime

If panic is invoked with a value whose type is derived from any of: bool, complex64, complex128, float32, float64, int, int8, int16, int32, int64, string, uint, uint8, uint16, uint32, uint64, uintptr, then the value will be printed, instead of just its address.

sync

The new method Map.LoadAndDelete atomically deletes a key and returns the previous value if present.

The method Map.Delete is more efficient.

time

The new method Ticker.Reset supports changing the duration of a ticker.