Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →
instance method
IO#lineno
lineno → integer
io.c
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static VALUE
rb_io_lineno(VALUE io)
{
rb_io_t *fptr;
GetOpenFile(io, fptr);
rb_io_check_char_readable(fptr);
return INT2NUM(fptr->lineno);
}
Returns the current line number for the stream; see Line Number.