This is fixed in the current source tree.
> > > The following example shows psql correctly clearing its input buffer
> > > when a line containing *only* a comment is seen, but not completely
> > > clearing the buffer (or not realizing that it is cleared; note the
> > > changed prompt) if the comment is at the end of a valid query.
> > >
> > > postgres=> -- comment
> > > postgres=> select 'hi'; -- comment
> > > ?column?
> > > --------
> > > hi
> > > (1 row)
> > >
> > > postgres->
> > But aren't they _in_ a new statement, that begins with '--'?
>
> ?? Sure, that's what psql thinks. But the first case shown above
> should also begin a new statement, changing the prompt (it doesn't,
> because after stripping the comment there are zero blanks in the
> line). I don't think that is the right behavior though.
>
> Things aren't a big problem the way they stand, but istm that a
> completely blank line (after stripping single-line comments) may as
> well be the same as an empty line,and that psql could figure that out.
>
> - Thomas
>
> --
> Thomas Lockhart lockhart@alumni.caltech.edu
> South Pasadena, California
>
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