Search notes:

ORA-03050: invalid identifier: is a reserved word

With «improved» error messages, the following select statement throws ORA-03050: invalid identifier: "USER" is a reserved word.
select tus.USER from v$tempseg_usage tus;

See also

ORA-03050 seems to be the «improved» error message for ORA-01747: invalid user.table.column, table.column, or column specification
v$reserved_words
Oracle Error Messages

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