Joseph Wright writes: > On 18/12/2010 01:31, Philipp Stephani wrote: > > Hello, > > > > lines 1377 to 1383 of l3tl.dtx read > > > > \tex_ifx:D \l_tl_tmpa_tl \l_tl_tmpb_tl > > \group_end: > > \prg_return_false: > > \tex_else:D > > \group_end: > > \prg_return_false: > > \tex_fi:D > > > > The first \prg_return_false: should be \prg_return_true:. > > > > Regards, > > Philipp > > > > Fixed in the SVN: CTAN update upcoming. looks like we should look at completing unit tests for the core modules. Any volunteer to help here? (quite a number are already there (under /testfiles directory) but as this bug shows not all functions are sufficiently tested yet) frank