Some of the most useful ones are:
<descrip>
-<tag>@-ddump-rdr@:</tag> reader output (earliest stuff in the compiler)
+<tag>@-ddump-parsed@:</tag> oarser output
<tag>@-ddump-rn@:</tag> renamer output
<tag>@-ddump-tc@:</tag> typechecker output
<tag>@-ddump-deriv@:</tag> derived instances
<nidx>-ddump-all option</nidx>%
<nidx>-ddump-most option</nidx>%
-<nidx>-ddump-rdr option</nidx>%
+<nidx>-ddump-parsed option</nidx>%
<nidx>-ddump-rn option</nidx>%
<nidx>-ddump-tc option</nidx>%
<nidx>-ddump-deriv option</nidx>%