Require for another way to exclude f_builtins when NameError raised from deleting

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8

The key is for _compute_suggestion_error to avoid including f_builtins in the list of candidates when a NameError is raised from a del statement, which always compiles into a DELETE_* bytecode, which we can check by looking at the bytecode that f_lasti points to.

So the problem can be solved by minimally changing:

d = (
    list(frame.f_locals)
    + list(frame.f_globals)
    + list(frame.f_builtins)
)

to (after importing dis):

d = (
    list(frame.f_locals)
    + list(frame.f_globals)
)
if not dis.opname[frame.f_code.co_code[frame.f_lasti]].startswith('DELETE_'):
    d += frame.f_builtins