return true
	}
	return st.Sel.Name == "StringData"
}

// isVariable reports whether x is a variable, possibly with field references.
func (p *Package) isVariable(x ast.Expr) bool {
	switch x := x.(type) {
	case *ast.Ident:
		return true
	case *ast.SelectorExpr:
		return p.isVariable(x.X)
	case *ast.IndexExpr:
		return true
	}
	return false
}