[BUG] Incorrect calculating a sequence of generated flows.

[ximyro]

Example

func Joo()  error{
   effe.BuildFlow(
       effe.Step(doSomething),
   )
  return nil
}

func Boo() error {
 effe.BuildFlow(
   effe.Step(Joo),
 )
 return  nil
}

func Foo() error {
  effe.BuildFlow(
    effe.Step(Boo),
    effe.Step(Boo), // Error will here
 )
 return nil
}

It triggers an error because the analyzer ignores dependencies for the component Boo because it has already added it to a sequence.

The sequence of dependencies will look like: [Boo, Joo, Boo]

 effe: failed generate: function Boo has the incorrect format: return value should be a function

effe/generator/analyzer.go

Lines 76 to 78 in e47545c

	_, ok := a.visited[a.flowDecls[flowDeclIndex].flowFunc.Name.Name]
	if ok {
	continue