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[;1m-spec list_to_existing_atom(String) -> atom() when String :: string().[0m
Returns the atom whose text representation is [;;4mString[0m, but only
if there already exists such atom. An atom exists if it has been
created by the run-time system by either loading code or creating
a term in which the atom is part.
Failure: [;;4mbadarg[0m if there does not already exist an atom whose
text representation is [;;4mString[0m.
Note:
Note that the compiler may optimize away atoms. For example,
the compiler will rewrite [;;4matom_to_list(some_atom)[0m to [;;4m[0m
[;;4m"some_atom"[0m. If that expression is the only mention of the
atom [;;4msome_atom[0m in the containing module, the atom will not
be created when the module is loaded, and a subsequent call to [;;4m[0m
[;;4mlist_to_existing_atom("some_atom")[0m will fail.
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