Fusebox 5 Invoke Parsing Issue

[Zax]

In trying to use the invoke verb in a circuit using the code(the 5.0 syntax):

<invoke object="data_service" method="read" returnvariable="points">
  <argument value="point" />
</invoke>

An error is thrown:
Parse error: syntax error, unexpected ';', expecting T_STRING or T_VARIABLE or '{' or '$' in ...path to parsed file....

In the parsed file, the relevant line is:

$points = $data_service-> ;

When I revert back to the 4.1 syntax:

<invoke object="data_service" methodcall="read('point')" returnvariable="points" />

The correct invocation is produced in the parsed file:

$points = $data_service->read('point');