Inspecting non-variable state from a breakpoint in Workbench

Question

Suppose I'm stopped at a breakpoint in Workbench, say at one of the y = ... lines in:

foo[a_] := Block[{y}, 
    If[Sin[a] > 0,
        y = -1,
        y = 1
        ]
    ]

How can I find out what Sin[a] is? Or more generally do some other evaluation using the current state of my program?

Answer 1

You can enter arbitrary expressions in the Expressions debugging view:

The function VariableValue must be used in such expressions in order to access any active variables.

If the Expressions view is not visible, you can open it from the Workbench main menu using Window / Show View... / Expressions.