Twig_Error_Syntax: A message inside a trans tag must be a simple text

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Quick tip:

When have a code like this:

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{% trans %}prefix.{{ varname }}{% endtrans %}

And receive this error:

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Twig_Error_Syntax: A message inside a trans tag must be a simple text

You can use the following piece of code as workaround.

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{{ ("prefix." ~ varname)|trans }}

PS: maybe this is not the best way to go.