sort.Strings(stdPackages)
		imports = listImports{
			stdPackages: stdPackages,
			importMap:   importMap,
			importDir:   importDir,
		}
		imports, _ = listCache.LoadOrStore(name, imports)
	}

	li := imports.(listImports)
	w.stdPackages = li.stdPackages
	w.importDir = li.importDir
	w.importMap = li.importMap
}

// listEnv returns the process environment to use when invoking 'go list' for

pkg go/build, func Import(string, string, ImportMode) (*Package, error)
pkg go/build, func ImportDir(string, ImportMode) (*Package, error)
pkg go/build, func IsLocalImport(string) bool
pkg go/build, method (*Context) Import(string, string, ImportMode) (*Package, error)
pkg go/build, method (*Context) ImportDir(string, ImportMode) (*Package, error)
pkg go/build, method (*Context) SrcDirs() []string