Sorry, forget the patch...
Index: src/packfile.c =================================================================== --- src/packfile.c (revision 16268) +++ src/packfile.c (working copy) @@ -2187,7 +2187,7 @@ default_dump_header(interp, self); - PIO_printf(interp, "mappings => [\n"); + PIO_printf(interp, "\n mappings => [\n"); for (i = 0; i < debug->num_mappings; i++) { PIO_printf(interp, " #%d\n [\n", i); PIO_printf(interp, " OFFSET => %d,\n", @@ -2211,7 +2211,7 @@ } PIO_printf(interp, " ],\n"); } - PIO_printf(interp, "]\n"); + PIO_printf(interp, " ]\n"); j = self->data ? 0: self->file_offset + 4; if (j % 8)