It is damned near impossible without using the "find" feature and extraordinarily tedious tag-counting (and tag-collapsing) to figure out whether or not a given variable is in scope at a particular part of the page. I can't control-click to go to the spot where the variable is declared; I get no indication as to whether the variable exists at a given spot; I don't even get a warning telling me that the variable may not have been declared conditionally at a given spot.
And then I get exceptions thrown when my predecessor's code references a variable that was conditionally declared earlier and the declaration got skipped this time. Madness.
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