instrument: Only use sourcemap on errors if & after sourcemap loaded.
instrument: Only use sourcemap on errors if & after sourcemap loaded.

kemitchell/smokestack,patrickkettner/smokestack,nolanlawson/smokestack,nolanlawson/smokestack,mattdesl/smokestack,kemitchell/smokestack,patrickkettner/smokestack,nowells/smokestack,mattdesl/smokestack,nowells/smokestack