Function patch_seq_read_line 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn patch_seq_read_line(stack: Stack) -> Stack

Read a line from stdin

Returns the line and a success flag:

• ( line true ) on success (line includes trailing newline)
• ( “” false ) on I/O error or EOF

Use string.chomp to remove trailing newlines if needed.

Line Ending Normalization

Line endings are normalized to \n regardless of platform. Windows-style \r\n endings are converted to \n. This ensures consistent behavior across different operating systems.

Stack effect: ( – String Bool )

Errors are values, not crashes.

Safety

Always safe to call