Evaluating Expressions

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The Watch tool can also be used to view the value of arbitrary expressions in the context of the current debug stack frame. These may be entered by clicking on any cell in the Watch tool's tree and editing or entering the desired expression in the Variable column. Press Enter to complete the edit.

Since expressions are evaluated in the context of the current debug stack frame, this feature is available only if there is a paused debug process. For the same reason, the value of expressions may change as you move up and down the stack.

Some caution is required to avoid undesired side-effects in the debug process. In cases where evaluating an expression results in changing the value of local or global variables, your debug process will continue in that changed context and the updated values will be shown in Wing's debugger tools.

Only expressions that evaluate to a value may be entered. Other statements, like variable assignments and import statements are rejected with an error. Exceptions that occur during evaluation or an expression are not shown, and breakpoints are not reached. To execute other statement types or to debug problems with an expression, use the Debug Console.