// action that installs libmangledname.so, which corresponds to
			// a list of packages, not just one.
			sep, path := "", ""
			if a.Package != nil {
				sep, path = " ", a.Package.ImportPath
			}
			err = fmt.Errorf("go %s%s%s: %v", cfg.CmdName, sep, path, err)
		}
	}()
	sh := b.Shell(a)

	a1 := a.Deps[0]
	a.buildID = a1.buildID
	if a.json != nil {