An error is triggered when using an identifier which does not exist, for example a variable which you did not declare yet.
Place the editor cursor on the error's line and
press Ctrl + 1, select
Declare variable ... from the list of quick fix proposals and press
Enter.
Note: The type of the new variable declaration is automatically detected from context.
Note: When the same undeclared identifier is used across multiple scopes, the variable declaration is placed in such a way that it is visible for all usages.
Note: Depending on context, several quick fix proposals might be available:
Tip: You may change the variable type. Press
Enter when done.
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