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[tlaplus] Priming TLA+ formulas

Hello again, in the example below I want to use Foo' to mean  a'=1 /\ b'=2. The compiler accepts this but TLC complains. Why is that?

Foo == a=1 /\ b=2
Init == Foo
Next == Foo /\ Foo'

Spec == Init /\ [][Next]_<<a,b>>

TLC complains 
TLC threw an unexpected exception.
This was probably caused by an error in the spec or model.
See the User Output or TLC Console for clues to what happened.
The exception was a java.lang.RuntimeException
In evaluation, the identifier a is either undefined or not an operator.
line 6, col 8 to line 6, col 8 of module test

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