[Octave-bug-tracker] [bug #42620] exist() does not use "class" argument

[John W. Eaton]

Follow-up Comment #5, bug #42620 (project octave):

Maybe we just need a function that can extract the first token from a .m file.
 If it is CLASSDEF, then return 8, otherwise 2?

We could check whether Matlab does this or actually parses the file and
requires it to be a valid classdef file by creating a file that has syntax
errors after the initial classdef token.  If it still returns 8 with the
syntax errors, we probably just need to check for the initial token value. 
Otherwise, we may need to parse the entire file and only return 8 if the
classdef file can be parsed without error.

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