advice--buffer-local-function-sampleadvice--buffer-local-function-sample is a variable defined in `
nadvice.el'. Its value is
nilDocumentation: keeps an example of the special "run the default value" functions. These functions play the same role as t in buffer-local hooks, and to recognize them, we keep a sample here against which to compare. Each instance is different, but `function-equal' will hopefully ignore those differences.