// Error. Errors that wrap ImportPathError (such as PackageError) may omit
// the import path.
type ImportPathError interface {
	error
	ImportPath() string
}

var (
	_ ImportPathError = (*importError)(nil)
	_ ImportPathError = (*mainPackageError)(nil)
	_ ImportPathError = (*modload.ImportMissingError)(nil)
	_ ImportPathError = (*modload.ImportMissingSumError)(nil)

		match["repo"] = expand(match, "https://{root}")
	}
	return nil
}

// importError is a copy of load.importError, made to avoid a dependency cycle
// on cmd/go/internal/load. It just needs to satisfy load.ImportPathError.
type importError struct {
	importPath string
	err        error
}

func importErrorf(path, format string, args ...any) error {
	err := &importError{importPath: path, err: fmt.Errorf(format, args...)}

			if b.AllowErrors && a.Package != nil {
				if a.Package.Error == nil {
					a.Package.Error = &load.PackageError{Err: err}
					a.Package.Incomplete = true
				}
			} else {
				var ipe load.ImportPathError
				if a.Package != nil && (!errors.As(err, &ipe) || ipe.ImportPath() != a.Package.ImportPath) {
					err = fmt.Errorf("%s: %v", a.Package.ImportPath, err)
				}
				base.Errorf("%s", err)
			}