scala - What is the purpose of the annotation after equal sign? -

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there val in scala written this:

val todo = action { notimplemented[play.twirl.api.html](views.html.defaultpages.todo()) }

what purpose of action after equal sign?

that's alternative syntax for

val todo = action(notimplemented[play.twirl.api.html](views.html.defaultpages.todo()))

which in turn syntactic sugar for

val todo = action.apply(notimplemented[play.twirl.api.html](views.html.defaultpages.todo()))

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