[9fans] strange problem with an rc function

[Rudolf Sykora]

Hello

I write
;fn aa {eqn $1^.ms |troff -ms | dpost -f >$1^.ps}
but then
;whatis aa
fn aa {eqn $1^.ms|troff -ms|>$1^.ps dpost -f}

What's going on?!

Thanks
Ruda