if !ok {
				t.Errorf("package %s: missing feature %q", fi.Name(), feature)
			}
			delete(w.features, feature)
		}

		for _, feature := range w.Features() {
			t.Errorf("package %s: extra feature not in golden file: %q", fi.Name(), feature)
		}
	}
}

func TestCompareAPI(t *testing.T) {
	tests := []struct {
		name                          string
		features, required, exception []string

name: Pkg.go.dev bugs or feature requests
description: Issues or feature requests for the documentation site
title: "x/pkgsite: issue title"
labels: ["pkgsite"]
body:
  - type: markdown
    attributes:
      value: "Please answer these questions before submitting your issue. Thanks!"
  - type: input
    id: url
    attributes:
      label: "What is the URL of the page with the issue?"
    validations:
      required: true
  - type: input

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"

name: Go vulnerability management - bugs and feature requests
description: Issues or feature requests about Go vulnerability management
title: "x/vuln: issue title"
labels: ["vulncheck or vulndb"]
body:
  - type: markdown
    attributes:

name: Gopls bugs or feature requests
description: Issues or feature requests for the Go language server (gopls)
title: "x/tools/gopls: issue title"
labels: ["gopls", "Tools"]
body:
  - type: markdown
    attributes:
      value: "Please answer these questions before submitting your issue. Thanks!"
  - type: input
    id: gopls-version
    attributes:
      label: "gopls version"
      description: "Output of `gopls -v version` on the command line"