v1.2.0 2025-06-24

Add go.dev/play as a compilation and execution backend:

• add flag -play to run the code remotely on the play.golang.org platform (the backend of go.dev/play). See examples.
• add flag -Eplay to show the transformed code (transformation for go.dev/play is different from a local run)
• add flag -share to store the transformed code on go.dev/play