The “docstring”, or documentation string, of a variable or function gives the description on it, given at its definition.
Returns the documentation-string for symbol. It should be the name of a special variable, function, macro, or a special form. If it’s not a variable, then value should be the function itself, like a closure.
Returns nil when not found. This function is defined in
structure can be nil. It was required in the old syntax.
Docstring is stored in a very complicated way. Those from installed files
are stored in DOC file. Others use the plist for the name. If
it’s a special variable, then docstring is in
property, and a closure and a macro, in