// If go.mod exists (not an old legacy module), check version is not too new.
		if data, err := os.ReadFile(filepath.Join(dir, "go.mod")); err == nil {
			goVersion := gover.GoModLookup(data, "go")
			if gover.Compare(goVersion, gover.Local()) > 0 {
				return "", &gover.TooNewError{What: mod.String(), GoVersion: goVersion}
			}
		} else if !errors.Is(err, fs.ErrNotExist) {
			return "", err
		}

		return dir, nil
	})
}

	//	pxtest - package of external test files
	var cover *load.TestCover
	if cfg.BuildCover {
		cover = &load.TestCover{
			Mode:  cfg.BuildCoverMode,
			Local: cfg.BuildCoverPkg == nil,
			Pkgs:  testCoverPkgs,
			Paths: cfg.BuildCoverPkg,
		}
	}
	pmain, ptest, pxtest, err := load.TestPackagesFor(ctx, pkgOpts, p, cover)
	if err != nil {
		return nil, nil, nil, err
	}

			base.Fatalf(`go work: invalid -go option; expecting something like "-go %s"`, gover.Local())
		}
	}
	if *editToolchain != "" && *editToolchain != "none" {
		if !modfile.ToolchainRE.MatchString(*editToolchain) {
			base.Fatalf(`go work: invalid -toolchain option; expecting something like "-toolchain go%s"`, gover.Local())
		}
	}

	anyFlags := *editGo != "" ||
		*editToolchain != "" ||
		*editJSON ||

		}

		return mods[0], roots[0], dirs[0], nil, nil
	}

	// Iterate over possible modules for the path, not all selected modules.
	// Iterating over selected modules would make the overall loading time
	// O(M × P) for M modules providing P imported packages, whereas iterating
	// over path prefixes is only O(P × k) with maximum path depth k. For

	}

	p.Internal.Imports = append(p.Internal.Imports, p1)
}

// PrepareForCoverageBuild is a helper invoked for "go install
// -cover", "go run -cover", and "go build -cover" (but not used by
// "go test -cover"). It walks through the packages being built (and
// dependencies) and marks them for coverage instrumentation when
// appropriate, and possibly adding additional deps where needed.

// *Builder.build method; in the case of "go test -cover" for
// a package with no test files, we stores some additional state
// information in the build actor to help with reporting.
type buildActor struct {
	// name of static meta-data file fragment emitted by the cover
	// tool as part of the package build action, for selected
	// "go test -cover" runs.
	covMetaFileName string
}

		Valid values are satconv, signext.

Environment variables for use with code coverage:

	GOCOVERDIR
		Directory into which to write code coverage data files
		generated by running a "go build -cover" binary.
		Requires that GOEXPERIMENT=coverageredesign is enabled.

Special-purpose environment variables:

	GCCGOTOOLDIR
		If set, where to find gccgo tools, such as cgo.

//			significantly more expensive.
//		Sets -cover.
//	-coverpkg pattern1,pattern2,pattern3
//		For a build that targets package 'main' (e.g. building a Go
//		executable), apply coverage analysis to each package matching
//		the patterns. The default is to apply coverage analysis to
//		packages in the main Go module. See 'go help packages' for a
//		description of package patterns.  Sets -cover.
//	-v

const usageMessage = "" +
	`Usage of 'go tool cover':
Given a coverage profile produced by 'go test':
	go test -coverprofile=c.out

Open a web browser displaying annotated source code:
	go tool cover -html=c.out

Write out an HTML file instead of launching a web browser:
	go tool cover -html=c.out -o coverage.html

Display coverage percentages to stdout for each function:
	go tool cover -func=c.out

		// (*Bool).CompareAndSwap is just over budget on 32-bit systems (386, arm).
		want["sync/atomic"] = append(want["sync/atomic"], "(*Bool).CompareAndSwap")
	}

	switch runtime.GOARCH {
	case "386", "wasm", "arm":
	default:
		// TODO(mvdan): As explained in /test/inline_sync.go, some
		// architectures don't have atomic intrinsics, so these go over
		// the inlining budget. Move back to the main table once that