tests/invalid/Mmakefile:
Add type_error_use_module to list of REDIRECT_OPT_ERROR_MODULES
as it produces error messages while making the .opt file.
tests/invalid/multiply_star.m:
Add description of .err_exp files.
tests/invalid/multiply_star.err_exp:
Update line numbers.
tests/invalid/multiply_star.err_exp2:
Add expected error output when compiling with intermodule
optimisation.
compiler/prog_out.m:
We a program used '*' to mean integer multiplication but didn't import
int.m, we used to print a misleading error message that said
"undefined symbol `star/2'. This was because we mangled the "*"
into "star" when printing the cons_id. While this is what you want
to do when printing cons_ids in e.g. comments in generated C code,
it is not what we want when printing error messages. Fix this.
tests/invalid/multiply_star.{m,err_exp}:
Add a regression test for this problem.
tests/invalid/Mmakefile:
Enable the new test.
