How to refer to parameters.yml in services.yml?

symfony service configuration parameters

you can ommit ...

imports:    - { resource: "parameters.yml" }parameters:

... parameters.yml should automatically be parsed and the parameters should be available for injection if you surround them with %.

Try:

services:    my.form.type:        class: My\Bundle\Form\Type\MyType        arguments: ["%test%"]        alias: my_form_type

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