Reject if a redirection operand expands to more than one field in an interactive shell

[magicant]

Assume we have two files named foo and bar in the current working directory. Type : <* in an interactive shell.

Current behavior:

• If the posixly_correct option is on, the shell tries to open a file named *
• Otherwise, the redirection fails with the error message filename `*' matches more than one file

Expected behavior:

• The redirection fails with the error message filename `*' matches more than one file regardless of the posixly_correct option

Reference:

• POSIX XCU 2.7 Redirection

Rationale:

• The new behavior is not strictly required by POSIX.1-2024, but it would be desirable to always report the error rather than to proceed as if the expansion did not occur.