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This fact is only used for preserving the original appearance of the source code after transformations. It declares that the types of the parameters of a lambda expression are omitted in the code. This behaviour is applied to ALL parameters of a specific lambda expression.

(e) -> System.out.println("button pressed")); 

instead of

(ActionEvent e) -> System.out.println("button pressed")); 

#id: lambdaT
ID of the lambdaT element.

JButton button = new JButton();
button.addActionListener((e) -> System.out.println("button pressed"));

localT(#Button, ..., 'button', ...).
...
callT(#Parent, ..., [#Lambda], #RefToAddActionListener, [], ...).
lambdaT(#Lambda, #Parent, #Enclosing, [#Parameter], #Body).
omit_lambdaParameterTypesT(#Lamba).
paramT(#Parameter, #Lambda, #RefToActionEvent 'e').             // Paramter of the lambda expression
callT(#Body, #Lambda, #Lambda, ...).                            // Sysout call (Body of the lambda expression)

ast_relation_type_spec(omit_lambdaParameterTypesT,[
	ast_arg(id,	mult(1,1,no ), id, [lambdaT])
]).