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name: Language Change Proposals about: Changes to the language title: "proposal: Go 2: " labels: Proposal Go2 LanguageChange

Author background

• Would you consider yourself a novice, intermediate, or experienced Go programmer?
• What other languages do you have experience with?

Related proposals

• Has this idea, or one like it, been proposed before?
  • If so, how does this proposal differ?
• Does this affect error handling?
  • If so, how does this differ from previous error handling proposals?
• Is this about generics?
  • If so, how does this relate to the accepted design and other generics proposals?

Proposal

• What is the proposed change?
• Who does this proposal help, and why?
• Please describe as precisely as possible the change to the language.
• What would change in the language spec?
• Please also describe the change informally, as in a class teaching Go.
• Is this change backward compatible?
  • Breaking the Go 1 compatibility guarantee is a large cost and requires a large benefit. Show example code before and after the change.
  • Before
  • After
• Orthogonality: how does this change interact or overlap with existing features?
• Is the goal of this change a performance improvement?
  • If so, what quantifiable improvement should we expect?
  • How would we measure it?

Costs

• Would this change make Go easier or harder to learn, and why?
• What is the cost of this proposal? (Every language change has a cost).
• How many tools (such as vet, gopls, gofmt, goimports, etc.) would be affected?
• What is the compile time cost?
• What is the run time cost?
• Can you describe a possible implementation?
• Do you have a prototype? (This is not required.)