code: func MatchCompLit(n ast.Node, ctx *Context, required string) *ast.CompositeLit {
  	if complit, ok := n.(*ast.CompositeLit); ok {
  		typeOf := ctx.Info.TypeOf(complit)
  		if typeOf.String() == required {
  			return complit
  		}
  	}
  	return nil
  }
docs: // MatchCompLit will match an ast.CompositeLit based on the supplied type